Veritiv Corporation ("Veritiv" or the "Company") is a North American business-to-business full-service provider of value-added packaging products and services, as well as facility solutions, print and publishing products and services. Additionally, Veritiv provides logistics and supply chain management solutions to its customers. Veritiv was established in 2014, following the merger (the "Merger") of International Paper Company's xpedx distribution solutions business ("xpedx") and UWW Holdings, Inc. ("UWWH"), the parent company of Unisource Worldwide, Inc. ("Unisource"). Veritiv operates from approximately 125120 distribution centers primarily throughout the United States ("U.S."), Canada and Mexico.

The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information and with the instructions to Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for a complete set of annual audited financial statements. The accompanying unaudited financial information should be read in conjunction with the Consolidated Financial Statements and Notes contained in the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission ("SEC") for the year ended December 31, 2020. In the opinion of management, all adjustments, including normal recurring accruals and other adjustments, considered necessary for a fair presentation of the interim financial information have been included. The operating results for the interim periods are not necessarily indicative of results for the full year, particularly in light of the novel coronavirus ("COVID-19") pandemic and its effects on the domestic and global economies. These financial statements include all of the Company's subsidiaries. All significant intercompany transactions between Veritiv's businesses have been eliminated.

The preparation of unaudited financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, revenue and expenses and certain financial statement disclosures. Estimates and assumptions are used for, but not limited to, revenue recognition, right-of-use ("ROU") asset and liability valuations, accounts and notes receivable valuations, inventory valuation, employee benefit plans, income tax contingency accruals and valuation allowances, multi-employer pension plan ("MEPP") withdrawal liabilities, contingency accruals and goodwill and other intangible asset valuations. Although these estimates are based on management's knowledge of current events and actions it may undertake in the future, actual results may ultimately differ from these estimates and assumptions.

Veritiv applies the five-step model to assess its contracts with customers. The Company's revenue is reported as net sales and is measured as the determinable transaction price, net of any variable consideration (e.g., sales incentives and rights to return product) and any taxes collected from customers and remitted to governmental authorities. Certain revenues are derived from shipments which are made directly from a manufacturer to a Veritiv customer. The Company is considered to be a principal to these transactions. Revenues from these sales are reported on a gross basis on the Condensed Consolidated Statements of Operations and have historically represented approximately 35% of Veritiv's total net sales. As a normal business practice, Veritiv does not enter into contracts that require more than one year to complete or that contain significant financing components. The Company considers handling and delivery as activities to fulfill its performance obligations. Billings for third-party freight are accounted for as net sales and handling and delivery costs are accounted for as distribution expenses. The Company has established credit and collection processes whereby collection assessments are performed and expected credit losses are recognized. Veritiv enters into incentive programs with certain of its customers, which are generally based on sales to those same customers. Veritiv follows the expected value method when estimating its retrospective incentives and records the estimated amount as a reduction to gross sales when revenue is recognized. Estimates of the variable consideration are based primarily on contract terms, current customer forecasts as well as historical experience.

Customer product returns are estimated based on historical experience and the identification of specific events necessitating an adjustment. The estimated return value is recognized as a reduction of gross sales and related cost of products sold. The estimated inventory returns value is recognized as part of inventories, while the estimated customer refund liability is recognized as part of other accrued liabilities on the Condensed Consolidated Balance Sheets. As of March 31,June 30, 2021 and December 31, 2020, estimated inventory returns were not significant.

A customer contract liability will arise when Veritiv has received payment for goods and services, but has not yet transferred the items to a customer and satisfied its performance obligations. Veritiv records a customer contract liability for performance obligations outstanding related to payments received in advance for customer deposits on equipment sales and other sale arrangements requiring prepayment, which are included in accounts payable on the Condensed Consolidated Balance Sheets. Veritiv expects to satisfy these remaining performance obligations and recognize the related revenues upon delivery of the goods

See the table below for a year-to-date summary of the changes to the customer contract liabilities for the three months ended March 31, 2021 and 2020:balance:

Historically, the Company's ten largest customers have generated approximately 10% of its consolidated annual net sales. Veritiv's principal markets are concentrated primarily across North America with net sales in the U.S., Canada and Mexico of approximately 87%, 10% and 2%, respectively. Veritiv evaluated the nature of the products and services provided to its customers as well as the nature of the customer and the geographical distribution of its customer base and determined that the best representative level of disaggregated revenue is the product category basis. The following is a brief description of the Company's 4 reportable segments, organized by major product category. This segment structure is consistent with the way the Chief Operating Decision Maker, who is Veritiv's Chief Executive Officer, makes operating decisions and manages the growth and profitability of the Company's business. The Company also has a Corporate & Other category, which includes certain assets and costs not primarily attributable to any of the reportable segments, as well as the Veritiv logistics solutions business which provides transportation and warehousing solutions.

The components of the accounts receivable allowances were as follows:

The Company leases certain property and equipment used for operations to limit its exposure to risks related to ownership. The major leased asset categories include: real estate, delivery equipment, material handling equipment and computer and office equipment. As of March 31,June 30, 2021, the Company operated from approximately 125120 distribution centers of which approximately 115110 were leased. These facilities are strategically located throughout the U.S., Canada and Mexico in order to efficiently serve the customer base in the surrounding areas while also facilitating expedited delivery services for special orders. The Company also leases various office spaces for corporate and sales functions.