Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YESþNOo

     Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. YESoNOþ

     Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YESþNOo

     Indicate by check mark if disclosure of delinquent filer pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporate by reference in Part III of the Form 10-K or any amendment to the Form 10-K. YESoNOþ NOo

     Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one):

     Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act.) YESoNOþ

     The aggregate market value of the voting stock held by non-affiliates of the registrant was $274,178,000$405,517,000 based on the reported last sale price of common stock on June 30, 2005,2006, which is the last business day of the registrant’s most recently completed second fiscal quarter.

     The number of shares of common stock of the registrant outstanding on February 27, 200623, 2007 was 39,176,43738,728,261.

     Certain information required by Part III of this annual report is incorporated by reference from the registrant’s definitive proxy statement for its annual meeting of stockholders to be held on May 18, 2006.17, 2007.

DESCRIPTION OF BUSINESS

Tyler Technologies, Inc. (“Tyler”) is a major provider of integrated information management solutions and services for local governments. We partner with clients to make local government more accessible to the public, more responsive to the needs of citizens and more efficient in its operations. We have a broad line of software products and services to address the information technology (“IT”) needs of virtually every major area of operation for cities, counties, schools and other local government entities. Most of our customers have our software installed in-house. For customers who prefer not to physically acquire the software and hardware, we provide outsourced hosting for some of our applications at one of our data centers through an applications service provider (“ASP”) arrangement. We provide professional IT services to our customers, including software and hardware installation, data conversion, training and, at times, product modifications. In addition, we are the nation’s largest provider of outsourced property appraisal services for taxing jurisdictions. We also provide continuing customer support services to ensure proper product performance and reliability, which provides us with long-term customer relationships and a significant base of recurring maintenance revenue.

Tyler was founded in 1966. Prior to 1998, we operated as a diversified industrial conglomerate, with operations in various industrial, retail and distribution businesses, all of which have been sold or otherwise disposed. In 1997, we embarked on a multi-phase growth plan focused on serving the specialized information management needs of local governments nationwide. In 1998 and 1999, we made a series of strategic acquisitions of companies in the local government IT market.

The state and local government market is one of the largest and most decentralized IT markets in the country, consisting of all 50 states, approximately 3,100 counties, 36,000 cities and towns and 14,50014,400 school districts. This market is also comprised of approximately 35,000 special districts and other agencies, each with specialized delegated responsibilities and unique information management requirements.

Traditionally, local government bodies and agencies performed state-mandated duties, including property assessment, record keeping, road maintenance, law enforcement, administration of election and judicial functions, and the provision of welfare assistance. Today, a host of emerging and urgent issues are confronting local governments, each of which demands a service response. These areas include criminal justice and corrections, administration and finance, public safety, health and human services, and public works. Transfers of responsibility from the federal and state governments to county and municipal governments and agencies in these and other areas also place additional service and financial requirements on these local government units. In addition, constituents of local governments are increasingly demanding improved service and better access to information from public entities. As a result, local governments recognize the increasing value of information management systems and services to, among other things, improve revenue collection, provide increased access to information, and streamline delivery of services to their constituents. Local government bodies are now recognizing that “e-government” is an additional responsibility for community development. From integrated tax systems to integrated civil and criminal justice information systems, many counties and cities have benefited significantly from the implementation of jurisdiction-wide systems that allow different agencies or government offices to share data and provide a more comprehensive approach to information management. Many city and county governmental agencies also have unique individual information management requirements, which must be tailored to the specific functions of each particular office.

segments of the market, where our business is primarily focused, are expected to be the most rapidly growing areas of the local government IT market, expanding from $10.9$13.1 billion in 20052007 to $13.5$16.1 billion in 2008.2010.

We provide a comprehensive and flexible suite of products and services that address the information technology needs of cities, counties, schools and other local government entities. We derive our revenues from four primary sources:

We design, develop and market a broad range of software products to serve mission-critical “back-office” functions of local governments. Our software applications are designed primarily for use on hardware supporting UNIX/NT operating systems. Many of our software applications include Internet-accessible solutions that allow for real-time public access to a variety of information or that allow the public to transact business with local governments via the Internet. Our software products and services are generally grouped in four major product areas:

Each of our core software systems consists of several fully integrated application modules. For customers who acquire the software for use in-house, we generally license our systems under standard license agreements that provide the customer with a fully paid, nonexclusive, nontransferable right to use the software. In some of the product areas, such as financials and property appraisal, we offer multiple solutions designed to meet the needs of different sized governments.

We also offer certain software products on an outsourced basis for customers who do not wish to maintain, update and operate these systems or to make large up-front capital expenditures to implement these advanced technologies. For these customers, we either host the applications and data at one of our data centers, or maintain the hardware and software at the client’s site.centers. Customers typically pay monthly fees under multi-year contracts for these services.

Historically, we have had a greater proportion of our annual revenues in the second half of our fiscal year due to governmental budget and spending cycles and the timing of system implementations for customers desiring to “go live” at the beginning of the calendar year.

We also offer specialized products that automate numerous city functions, including municipal courts, parking tickets, equipment and project costing, animal licenses, business licenses, permits and inspections, code enforcement, citizen complaint tracking, ambulance billing, fleet maintenance, and cemetery records management.

In January, 2006 we acquired two companies whose products will be included within our Financials division. MazikUSA, Inc. offersbegan offering a Student Information Systemstudent information system for K-12 schools, which manages such applications as scheduling, grades and attendance. TACS, Inc. offersattendance and software products to manage public sector pension funds. These acquisitions added products that were not previously a part of Tyler’s portfolio.

Tyler’s financial products include Web components that enhance local governments’ service capabilities by facilitating online access to information for both employees and citizens and enabling online transactions.

We offer a complete, integrated suite of products designed to automate, track and manage the law enforcement and judicial process, from the initiation of incidents in computer-aided dispatch/emergency 911 systems through the process of arrest, court appearances and final disposition to probation. These applications may be installed on a stand-alone basis or integrated with our other products to eliminate duplicate entries and improve efficiency.

Our Web-enabled court systems are designed to automate the tracking and management of information involved in criminal and civil court cases, including municipal, family and probate courts. These applications track the status of criminal and civil cases, process fines and fees and generate the specialized judgment and sentencing documents, citations, notices and forms required in court proceedings. Additional judicial applications automate the management of court calendars, coordinate judge’s schedules, generate court dockets, manage justice of the peace processes and automate district attorney and prosecutor functions. Related products include jury selection, “hot” check processing, and adult and juvenile probation management applications. Our courtroom technologies allow judges to review cases, calendars, and to scan documents and mug shots using a Web browser. Additionally, document-imaging options include the ability to scan, store, retrieve and archive a variety of criminal and civil case-related documents.

Our law enforcement systems automate police and sheriff functions from dispatch and records management through booking and jail management. Searching, reporting and tracking features are integrated, allowing reliable, up-to-date access to current arrest and incarceration data. The systems also provide warrant checks for visitors or book-ins, inmate classification and risk assessment, commissary, property and medical processing, and automation of statistics and state and federal reporting. Our computer-aided dispatch/emergency 911 system tracks calls and the availability of emergency response vehicles, interfaces with local and state searches, and generally assists dispatchers in processing emergency situations. The law enforcement and jail management systems are fully integrated with the suite of court products that manages the judicial process.

Our court and law enforcement systems allow the public to access, via the Internet, a variety of information, including criminal and civil court records, jail booking and release information, bond and bondsmen information, and court calendars and dockets. In

We provide systems and software that automate the appraisal and assessment of real and personal property, including record keeping, mass appraisal, inquiry and protest tracking, appraisal and tax roll generation, tax statement processing, and electronic state-level reporting. These systems are image- and video-enabled to facilitate the storage of and access to the many property-related documents and for the online storage of digital photographs of properties for use in defending values in protest situations. Other related tax applications are available for agencies that bill and collect taxes, including cities, counties, school tax offices, and special taxing and collection agencies. These systems support billing, collections, lock box operations, mortgage company electronic payments, and various reporting requirements.

We offer a number of specialized applications designed to help county governments enhance and automate courthouse operations. These systems record and index information for the many documents maintained at the courthouse, such as deeds, mortgages, liens, UCC financing statements and vital records (birth, death and marriage certificates).

We provide a variety of professional IT services to customers who utilize our software products. Virtually all of our customers contract with us for installation, training, and data conversion services in connection with their purchase of Tyler’s software products. The complete implementation process for a typical system includes planning, design, data conversion, set-up and testing. At the culmination of the implementation process, an installation team travels to the customer’s facility to ensure the smooth transfer of data to the new system. Installation fees are charged separately to customers on either a fixed-fee or hourly charge basis, depending on the contract, with full pass-through to customers of travel and other out-of-pocket expenses.

Both in connection with the installation of new systems and on an ongoing basis, we provide extensive training services and programs related to our products and services. Training can be provided in our training centers, onsite at customers’ locations, or at meetings and conferences, and can be customized to meet customers’ requirements. The vast majority of our customers contract with us for training services, both to improve their employees’ proficiency and productivity and to fully utilize the functionality of our systems. Training services are generally billed on an hourly basis, along with travel and other expenses.

Following the implementation of our software systems, we provide ongoing software support services to assist our customers in operating the systems and to periodically update the software. Support is provided over the phone to customers through help desks staffed by our customer support representatives. For more complicated issues, our staff, with the customers’ permission, can log on to customers’ systems remotely. We maintain our customers’ software largely through releases that contain improvements and incremental additions, along with updates necessary because of legislative or regulatory changes.

We are the nation’s largest provider of property appraisal outsourcing services for local government taxing authorities. These services include:

Local government taxing entities normally reappraise properties from time to time to update values for tax assessment purposes and to maintain equity in the taxing process. In some jurisdictions, reassessment cycles are mandated by law; in others, they are discretionary. While some taxing jurisdictions perform reappraisals in-house, many local governments outsource this function because of its cyclical nature and because of the specialized knowledge and expertise requirements associated with it. Our business unit that provides appraisal outsourcing services to local governments has been in this business since 1938.

In some instances, we also sell property tax and/or appraisal software products in connection with appraisal outsourcing projects, while other customers may only engage us to provide appraisal services. Appraisal outsourcing services are somewhat seasonal in nature to the extent that winter weather conditions reduce the productivity of data collection activities in connection with those projects.

Our objective is to grow our revenue and earnings internally, supplemented by focused strategic acquisitions. The key components of our business strategy are to:

Customers consist primarily of county and municipal agencies, school districts and other local government offices. In counties, customers include the auditor, treasurer, tax assessor/collector, county clerk, district clerk, county and district court judges, probation officers, sheriff, and county appraiser. At municipal government sites, customers include directors from various departments, including administration, finance, utilities, public works, code enforcement, personnel, purchasing, taxation, municipal court, and police. Contracts for software products and services are generally implemented over periods of three months to one year, with annually renewing maintenance and support update agreements thereafter. Although either the customer or we can terminate these agreements, historically almost all support and maintenance agreements are automatically renewed annually. Contracts for appraisal outsourcing services are generally one to three years in duration. During 2005,2006, approximately 38% of our revenue was attributable to ongoing support and maintenance agreements.

We compete with numerous local, regional, and national firms that provide or offer some or many of the same products and services that we provide. Most of these competitors are smaller companies that may be able to offer less expensive solutions than ours. Many of these firms operate within a specific geographic area and/or in a narrow product or service niche. We also compete with national firms, some of which have greater financial and technical resources than we do, including Oracle Corporation, Lawson Software, Inc., SAP AG, MAXIMUS, Inc., Affiliated Computer Services, Inc., SunGard Data Systems, Inc., New World Systems and Manatron, Inc. In addition, we sometimes compete with consulting and systems integration firms, such as BearingPoint, Inc. and Accenture Ltd., which develop custom systems, primarily for larger governments. We also occasionally compete with central internal information service departments of local governments, which require us to persuade the end-user department to discontinue service by its own personnel and outsource the service to us. We compete on a variety of factors, including price, service, name recognition, reputation, technological capabilities, and the ability to modify existing products and services to accommodate the individual requirements of the customer. Our ability to offer an integrated system of applications for several offices or departments is often a competitive strength. Local governmental units often are required to seek competitive proposals through a request for proposal process.

All computers, peripherals, printers, scanners, operating system software, office automation software, and other equipment necessary for the implementation and provision of our software systems and services are presently available from several third-party sources. Hardware is purchased on original equipment manufacturer or distributor terms at discounts from retail. We have not experienced any significant supply problems.

At December 31, 2005,2006, our estimated salesrevenue backlog was approximately $165.4$205.9 million, compared to $142.2$165.4 million at December 31, 2004.2005. The backlog represents signed contracts under which the products have not been delivered or the services have not been performed as of year-end. Approximately $130.5$150.3 million of the backlog is expected to be installed or services are expected to be performedrecognized during 2006.2007.

We regard certain features of our internal operations, software, and documentation as confidential and proprietary and rely on a combination of contractual restrictions, trade secret laws and other measures to protect our proprietary intellectual property. We generally do not rely on patents. We believe that, due to the rapid rate of technological change in the computer software industry, trade secrets and copyright protection are less significant than factors such as knowledge, ability and experience of our employees, frequent product enhancements, and timeliness and quality of support services. We typically license our software products under non-exclusive license agreements which are generally non-transferable and have a perpetual term.

We file annual, quarterly, current and other reports, proxy statements and other information with the Securities and Exchange Commission, or SEC, pursuant to the Securities Exchange Act. You may read and copy any materials we file with the SEC at the SEC’s Public Reference Room by calling the SEC at 1-800-SEC-0330. The SEC maintains an Internet site that contains reports, proxy and other information statements, and other information regarding issuers, including us, that file electronically with the SEC. The address of this site ishttp://www.sec.gov.

We also maintain an Internet site atwww.tylerworks.com.www.tylertech.com. We make available free of charge through this site our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Forms 4 and 5, Current Reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Our “Code of Business Conduct and Ethics” is also available on our Web site. We intend to satisfy the disclosure requirements regarding amendments to, or waivers from, a provision of our Code of Business Conduct and Ethics by posting such information on our Web site.

An investment in our common stock involves a high degree of risk. Investors evaluating our company should carefully consider the factors described below and all other information contained in this Annual Report. Any of the following factors could materially harm our business, operating results, and financial condition. Additional factors and uncertainties not currently known to us or that we currently consider immaterial could also harm our business, operating results, and financial condition. This section should be read in conjunction with the Consolidated Financial Statements and related Notes and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in this Annual Report. We may make forward-looking statements from time to time, both written and oral. We undertake no obligation to revise or publicly release the results of any revisions to these forward-looking statements. Our actual results may differ materially from those projected in any such forward-looking statements due to a number of factors, including those set forth below and elsewhere in this Annual Report.

A decline in the demand for information technology among our current and prospective customers may result in decreased revenues or a lower growth rate for us because our sales depend, in part, on our customers’ level of funding for new or additional information technology systems and services. Moreover, demand for our solutions may be reduced by a decline in overall demand for computer software and services. Accordingly, we cannot assure you that we will be able to increase or maintain our revenues.

Our actual revenues in a quarter could fall below expectations, which could lead to a decline in our stock price. Our revenues and operating results are difficult to predict and may fluctuate substantially from quarter to quarter. Revenues from license fees in any quarter depend substantially upon our contracting activity and our ability to recognize revenues in that quarter in accordance with our revenue recognition policies. Our quarterly revenue may fluctuate and may be difficult to forecast for a variety of reasons, including the following:

We realize lower margins on software and appraisal service revenues than on license revenue. The majority of our contracts include both software licenses and professional services. Therefore, an increase in the percentage of software service and appraisal service revenue compared to license revenue could have a detrimental impact on our overall gross margins and could adversely affect operating results.

We believe we are a leading provider of integrated solutions for the public sector. However, we face competition from a variety of software vendors that offer products and services similar to those offered by us, as well as from companies offering to develop custom software. We compete on the basis of a number of factors, including:

Our continued success will depend upon the availability and performance of our key management, sales, marketing, customer support, and product development personnel. The loss of key management or technical personnel could adversely affect us. We believe that our continued success will depend in large part upon our ability to attract, integrate, and retain such personnel. We have at times experienced and continue to experience difficulty in recruiting qualified personnel. Competition for qualified software development, sales, and other personnel is intense, and we cannot assure you that we will be successful in attracting and retaining such personnel.

Some of our customers, primarily those for our property appraisal services, require that we secure performance bonds before they will select us as their vendor. The number of qualified, high-rated insurance companies that offer performance bonds has decreased in recent years, while the costs associated with securing these bonds has increased dramatically. In addition, we are generally required to issue a letter of credit as security for the issuance of a performance bond. EachWe periodically enter into long-term borrowing agreements and each letter of credit we issue without corresponding cash collateral reducesmay reduce our borrowing capacity under our senior secured creditthe borrowing agreement. We cannot guarantee that we will be able to secure such performance bonds in the future on terms that are favorable to us, if at all. Our inability to obtain performance bonds on favorable terms or at all could impact our future ability to win some contract awards, particularly large property appraisal services contracts, which could have a material adverse effect on our business, financial condition, and results of operations.

Recent volatility in the stock markets, increasing shareholder litigation, the adoption of expansive legislation that redefines corporate controls (in particular, legislation adopted to prevent future corporate and accounting scandals), as well as other factors have recently led to significant increases in premiums for directors’ and officers’ liability insurance. The number of insurers offering directors and officers insurance at competitive rates has also decreased in recent years. We cannot predict when the insurance market for such coverage will stabilize, if at all. The continued volatilityVolatility of the insurance market may result in future increases in our general and administrative expenses, which may adversely affect future operating results.

The market price of our common stock may be volatile and may be significantly affected by many different factors. Some examples of factors that can have a significant impact on our stock price include:

In addition, the stock market has from time to time experienced significant price and volume fluctuations that have particularly affected the market prices for the common stock of technology companies. These broad market fluctuations may adversely affect the market price of our common stock. In the past, following periods of volatility in the market price of a particular company’s securities, securities class action litigation has often been brought against that company. We cannot assure you that similar litigation will not occur in the future with respect to us. Such litigation could result in substantial costs and a diversion of management’s attention and resources, which could have a material adverse effect upon our business, operating results, and financial condition.

We have not declared or paid a cash dividend since we entered the business of providing software solutions and services to the public sector in February 1998. OurAdditionally, we may enter into credit agreement restrictsagreements that could restrict our ability to pay cash dividends. We intend to retain earnings for use in the operation and expansion of our business. We do not anticipate paying any cash dividends on our common stock in the foreseeable future.

Our board of directors may issue up to 1,000,000 shares of preferred stock and may determine the price, rights, preferences, privileges, and restrictions, including voting and conversion rights, of these shares of preferred stock. These determinations may be made without any further vote or action by our stockholders. The rights of the holders of our common stock will be subject to, and may be adversely affected by, the rights of the holders of any preferred stock that may be issued in the future. The issuance of preferred stock may make it more difficult for a third party to acquire a majority of our outstanding voting stock. In addition, some provisions of our Certificate of Incorporation, Bylaws, and of the Delaware General Corporation Law could also delay, prevent, or make more difficult a merger, tender offer, or proxy contest involving us.

From time to time in press releases and otherwise, we may publish forecasts or other forward-looking statements regarding our results, including estimated revenues or net earnings. Any forecast of our future performance reflects various assumptions. These assumptions are subject to significant uncertainties, and as a matter of course, any number of them may prove to be incorrect. Further, the achievement of any forecast depends on numerous risks and other factors (including those described in this discussion), many of which are beyond our control. As a result, we cannot be certain that our performance will be consistent with any management forecasts or that the variation from such forecasts will not be material and adverse. Current and potential stockholders are cautioned not to base their entire analysis of our business and prospects upon isolated predictions, but instead are encouraged to utilize our entire publicly available mix of historical and forward-looking information, as well as other available information regarding us, our products and services, and the software industry when evaluating our prospective results of operations.

Not applicable.

We occupy a total of approximately 280,000275,000 square feet of office and warehouse space, 30,00027,000 of which we own. We lease our principal executive office located in Dallas, Texas, as well as other offices for our divisions in Colorado, Iowa, Maine, Ohio, Texas and Washington.

We did not pay any cash dividends in 20052006 or 2004. Our2005. During 2006 our bank credit agreement containscontained restrictions on the payment of cash dividends. Also, weWe terminated this credit agreement in January 2007. We intend to retain earnings for use in the operation and expansion of our business, and, therefore, we do not anticipate declaring a cash dividend in the foreseeable future.

The following table summarizes certain information related to our stock option plan and our Employee Stock Purchase Plan (“ESPP”). There are no warrants or rights related to our equity compensation plans as of December 31, 2005.2006.

FORWARD LOOKING STATEMENTS

In addition to historical information, this Annual Report on Form 10-K contains forward-looking statements. The forward-looking statements are made in reliance upon safe harbor provisions of the Private Securities Litigation Reform Act of 1995. The forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those reflected in the forward-looking statements. Factors that might cause such a difference include, but are not limited to, those discussed in Item 1A, “Risk Factors.” Readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management’s opinions only as of the date hereof. We undertake no obligation to revise or publicly release the results of any revision to these forward-looking statements. Readers should carefully review the risk factors described in this Annual Report and other documents we file from time to time with the SEC.

When used in this Annual Report, the words “believes,” “plans,” “estimates,” “expects,” “anticipates,” “intends,” “continue,” “may,” “will,” “should,” “projects,” “forecasts,” “might,” “could” or the negative of such terms and similar expressions are intended to identify forward-looking statements.

We provide integrated information management solutions and services for local governments. We develop and market a broad line of software products and services to address the information technology (“IT”) needs of cities, counties, schools and other local government entities. In addition, we provide professional IT services to our customers, including software and hardware installation, data conversion, training and for certain customers, product modifications, along with continuing maintenance and support for customers using our systems. We also provide property appraisal outsourcing services for taxing jurisdictions.

Our products are generally grouped into four major areas:

We monitor and analyze several key performance indicators in order to manage our business and evaluate our financial and operating performance. These indicators include the following:

Our discussion and analysis of financial condition and results of operations is based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets and liabilities at the date of the financial statements, the reported amounts of revenues, cost of revenues and expenses during the reporting period, and related disclosure of contingent assets and liabilities. The Notes to the Consolidated Financial Statements included as part of this Annual Report describe our significant accounting policies used in the preparation of the consolidated financial statements. On an on-going basis, we evaluate our estimates, including, but not limited to, those related to intangible assets, bad debts and our service contracts. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

We believe the following critical accounting policies affect significant judgments and estimates used in the preparation of our consolidated financial statements.

Revenue Recognition. We recognize revenues in accordance with the provisions of Statement of Position (“SOP”) 97-2, “Software Revenue Recognition,” as amended by SOP 98-4 and SOP 98-9, as well as Technical Practice Aids issued from time to time by the American Institute of Certified Public Accountants, and in accordance with the Securities and Exchange Commission Staff Accounting Bulletin No. 104 “Revenue Recognition.” We recognize revenue on our appraisal services contracts using the proportionate performance method of accounting, with considerations for the provisions of Emerging Issue Task Force No. 00-21, “Revenue Arrangements with Multiple Deliverables.” Our revenues are derived from sale of software licenses, appraisal services, maintenance and support, and services that typically range from installation, training and basic consulting to software modification and customization to meet specific customer needs. For multiple element software arrangements, which do not entail the performance of services that are considered essential to the functionality of the software, we generally record revenue when the delivered products or performed services result in a legally enforceable and non-refundable claim. We maintain allowances for doubtful accounts and sales adjustments, which are provided at the time the revenue is recognized. Because most of our customers are governmental entities, we rarely incur a loss resulting from the inability of a customer to make required payments. In a limited number of cases, we encounter a customer who is dissatisfied with some aspect of the software product or our service, and we may offer a “concession” to such customer. In those limited situations where we grant a concession, we rarely reduce the contract arrangement fee, but alternatively may perform additional services, such as additional training or programming a minor feature the customer had in their prior software solution. These amounts have historically been considered nominal. In connection with our customer contracts and the adequacy of related allowances and measures of progress towards contract completion, our project managers are charged with the responsibility to continually review the status of each customer on a specific contract basis. Also, management at our corporate offices as well as at our operating companieswe review, on at least a quarterly basis, significant past due accounts receivable and the adequacy of related reserves. Events or changes in circumstances that indicate that the carrying amount for the allowances for doubtful accounts and sales adjustments may require revision, include, but are not limited to, deterioration of a customer’s financial condition, failure to manage our customer’s expectations regarding the scope of the services to be delivered, and defects or errors in new versions or enhancements of our software products.

For those software arrangements that includeinvolve significant production, modification or customization of the software, which is considered essential to its functionality, and for substantially all real estate appraisal outsourcing projects, we recognize revenue and profit as the work progresses using the percentage-of-completion method and the proportionate performance method of revenue recognition. These methods rely on estimates of total expected contract revenue, billings and collections and expected contract costs, as well as measures of progress toward completion. We believe reasonably dependable estimates of revenue and costs and progress applicable to various stages of a contract can be made. At times, we perform additional and/or non-contractual services for little to no incremental fee to satisfy

estimates of expected costs or revenues, we revise our cost and revenue estimates, and any revisions are charged to income in the period in which the facts that give rise to that revision first become known.

We use contract accounting, primarily the percentage-of-completion method, and apply the provisions of SOP No. 81-1 “Accounting for Performance of Construction — Type and Certain Production — Type Contracts” for those software arrangements that includeinvolve significant production, modification or customization or modification of the software, or where our software services are otherwise considered essential to the functionality of the software. In addition, we recognize revenue using the proportionate performance method of revenue recognition for our property appraisal projects, some of which can range up to three years. In connection with these and certain other contracts, we may perform the work prior to when the services are billable and/or payable pursuant to the contract. The termination clauses in most of our contracts provide for the payment for the fair value of products delivered and services performed in the event of an early termination.

In connection with certain of our contracts, we have recorded retentions receivable or unbilled receivables consisting of costs and estimated profit in excess of billings as of the balance sheet date. Many of the contracts which give rise to unbilled receivables at a given balance sheet date are subject to billings in the subsequent accounting period. Management reviews unbilled receivables and related contract provisions to ensure we are justified in recognizing revenue prior to billing the customer and that we have objective evidence which allows us to recognize such revenue. In addition, we have a sizable amount of deferred revenue which represents billings in excess of revenue earned. ThisThe majority of this liability primarily consists of maintenance billings in which payments are made in advance and the revenue is ratably earned over the maintenance period, generally one year. We also have deferred revenue for those contracts in which we receive a deposit and the conditions in which to record revenue for the service or product has not been met. On a periodic basis, we review by customer the detail components of our deferred revenue to ensure our accounting remains appropriate.

Intangible Assets and Goodwill. Our business acquisitions typically result in the creation of goodwill and other intangible asset balances, and these balances affect the amount and timing of future period amortization expense, as well as expense we could possibly incur as a result of an impairment charge. The cost of acquired companies is allocated to identifiable tangible and intangible assets based on estimated fair value, with the excess allocated to goodwill. Accordingly, we have a significant balance of acquisition date intangible assets, including software, customer related intangibles, trade name and goodwill. In addition, we capitalize software development costs incurred subsequent to the establishment of technological feasibility. Certain of theseThese intangible assets are amortized over their estimated useful lives. All intangible assets with definite and indefinite lives are reviewed for impairment annually or whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of goodwill is generally measured by a comparison of the carrying amount of an asset to its fair value, generally determined by estimated future net cash flows expected to be generated by the asset. Recoverability of other intangible assets is generally measured by comparison of the carrying amount to estimated undiscounted future cash flows. The assessment of recoverability or of the estimated useful life for amortization purposes will be affected if the timing or the amount of estimated future operating cash flows is not achieved. Events or changes in circumstances that indicate the carrying amount may not be recoverable include, but are not limited to, a significant decrease in the market value of the business or asset acquired, a significant adverse change in the extent or manner in which the business or asset acquired is used, or a significant adverse change in the business climate. In addition, products, capabilities, or technologies developed by others may render our software products obsolete or non-competitive.

The following discussion compares the historical results of operations on a basis consistent with GAAP for the years ended December 31, 2006, 2005 2004 and 2003. These results include the results of the operations of Eden from the date of its acquisition on December 2, 2003. See Note 2 in the Notes to the Consolidated Financial Statements.2004.

The following table sets forth a comparison of the key components of our revenues for the following years ended December 31:

Software services. Changes in software services revenues consist of the following components:

The following table sets forth a comparison of the key components of our cost of revenues, and associated gross margins, and those components stated as a percentage of related revenues for the following years ended December 31:

The following table sets forth a comparison of our selling, general and administrative (“SG&A”) expenses for the following years ended December 31:

Financing activities used cash of $6.0 million in 2006 compared to $14.8 million in 2005 compared toand $9.9 million in 2004 and $25.4 million in 2003.2004. Cash used in financing activities was primarily comprised of purchases of treasury shares, net of proceeds from stock option exercises. Financing activities in 2003 included theexercises and contributions from our employee stock purchase of approximately 6.0 million shares of our common stock through our modified Dutch Auction tender offer and purchases on the open market for $24.1 million.plan.

During 2005,2006, we purchased approximately 2.51.0 million shares of our common stock for an aggregate cash purchase price of $17.7$10.5 million.

In 2005,2006, we received $1.8$2.9 million from the exercise of options to purchase approximately 436,000623,000 shares of our common stock under our employee stock option plan. During 2005 we issued 436,000 shares of common stock and received $1.8 million in aggregate proceeds, upon exercise of stock options and during 2004 we issued 680,000 shares of common stock and received $1.9 million in aggregate proceeds upon exercise of stock options and during 2003 we issued 554,000 shares of common stock and received $1.7 million in aggregate proceeds upon exercise of stock options.

DuringIn both 2006 and 2005, we received $1.0 million for contributions to the Tyler Technologies, Inc. Employee Stock Purchase Plan (“the ESPP”), which. The ESPP was adopted by our shareholders in May 2004.

Subsequent to December 31, 20052006 and through February 27, 200623, 2007 we purchased approximately 250,000188,000 shares of our common stock for an aggregate cash purchase price of $2.2$2.6 million.

On February 11, 2005, we entered into a revolving bank credit agreement (the “Credit Facility”). The Credit Facility matures February 11, 2008 and provides for total borrowings of up to $30.0 million andWe maintain a $10.0 million Letter of Credit facility under which the banksbank will issue cash collateralized letters of credit. As of December 31, 2005, our effective interest rate was 5.9% under the Credit Facility. As of December 31, 20052006 we had no debt and outstanding letters of credit totaling $4.1$5.0 million to secure surety bonds required by some of our customer contracts. As of February 27, 2006, we had no outstanding borrowings under the Credit Facility.

In January 2006,the first quarter of 2007 we acquired two small companies MazikUSA, Inc. and TACS, Inc. Thea building for a combined cash purchase price for the two companies was approximately $14.2 million, comprised of approximately $11.3 million cash and 325,000 shares of Tyler common stock.$5.0 million. We have not finalized the allocation of the excess purchase price over the fair value of the net identifiable assets of the acquired companies but expect this allocation will result in non-cash charges that willmay have a small dilutive effect on earnings per share in 2006.2007.

Excluding acquisitions, we anticipate that 20062007 capital spending will be between $3.5 million and $4.0 million, the majority of which will be related to computer equipment and software for infrastructure expansions. We currently do not expect to capitalize significant amounts related to software development in 2007 but the actual amount and timing of those costs, and whether they are capitalized or expensed may result in additional capitalized software development. Capital spending in 20062007 is expected to be funded from existing cash balances and cash flows from operations.

From time to time we will engage in discussions with potential acquisition candidates. In order to pursue such opportunities, which could require significant commitments of capital, we may be required to incur debt or to issue additional potentially dilutive securities in the future. No assurance can be given as to our future acquisition opportunities and how such opportunities will be financed. In the absence of future acquisitions of other businesses, we believe our current cash balances and expected future cash flows from operations will be sufficient to meet our anticipated cash needs for working capital, capital expenditures and other activities through the next twelve months. If operating cash flows are not sufficient to meet our needs, we may borrow under ourbelieve that credit agreement.would be available to us.

We lease office facilities, as well as transportation, computer and other equipment used in our operations under non-cancelable operating lease agreements expiring at various dates through 2013. Most leases contain renewal options and some contain purchase options. Following are the future obligations under non-cancelable leases at December 31, 20052006 (in thousands):