HOMBURGER

                                                                     Exhibit 8.2





                           By Facsimile and Courier

                           To:
                           UBS AG
                           Bahnhofstr. 45
                           P.O. Box
                           8098 Zurich
                           Switzerland

                           March 24, 2006 GRD | WEN
                           309746 | GRD | 000023.doc



 Homburger Rechtsanwalte   UBS AG - Registration Statement F-3 for Debt
 Weinbergstrasse 56 | 58   Securities, Warrants and Preferred Securities
          CH-8006 Zurich
  Postfach 338 | CH-8035   Ladies and Gentlemen:
                  Zurich
Telefon +41 43 222 10 00   We have acted as special Swiss tax counsel to UBS AG,
    Fax +41 43 222 15 00   Zurich and Basel, Switzerland (UBS AG), UBS Preferred
    lawyers@homburger.ch   Funding Company LLC V through IX, Wilmington,
                           Delaware, USA, and UBS Preferred Funding Trust V
                           through IX, Wilmington, Delaware, USA, in connection
                           with the (i) Prospectus I (as defined below) relating
                           to the registration of an unspecified aggregate
                           initial offering price or number of debt securities
                           and warrants and (ii) Prospectus II (as defined
                           below) relating to the registration of an unspecified
                           aggregate initial offering price or number of trust
                           preferred securities; in each case as contained in
                           and pursuant to the Registration Statement on Form
                           F-3 as filed with the Securities and Exchange
                           Commission on March 27, 2006 (the Registration
                           Statement).

                           As such counsel, we have been requested to render a
                           tax opinion as to the tax considerations in the
                           Prospectus I and the Prospectus II (each as defined
                           below) under the captions "Tax Considerations Under
                           the Laws of Switzerland".

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                           Capitalized terms used herein shall have the meaning
                           attributed to them in the Prospectus I and the
                           Prospectus II unless defined otherwise herein.

                  I.       Basis of Opinion

                           This tax opinion is confined to and given on the
                           basis of the tax legislation of Switzerland in force
                           at the date hereof as currently applied, which laws
                           are subject to change (or subject to changes in
                           interpretation), possibly with retroactive effect. In
                           the absence of explicit statutory or established case
                           law, we base our opinion solely on our independent
                           professional judgement.

                           This tax opinion is also confined to the matters
                           stated herein and is not to be read as extending, by
                           implication or otherwise, to any agreement or
                           document referred to in the documents below (other
                           than listed below) or any other matter.

                           For purposes of this tax opinion we have not
                           conducted any due diligence or similar investigation
                           as to factual circumstances, which are or may be
                           referred to in the documents below, and we express no
                           opinion as to the accuracy of representations and
                           warranties of facts set out in such documents or the
                           factual background assumed therein.

                           For the purpose of giving this tax opinion, we have
                           only examined originals or copies of the following
                           documents (collectively the Documents):

                           (i)      an electronic copy of the Registration
                                    Statement on Form F-3 as filed with the
                                    Securities and Exchange Commission on March
                                    27, 2006 containing:

                                    -        the Prospectus relating to UBS AG
                                             Debt Securities and Warrants
                                             (Prospectus I); and

                                    -        the Prospectus relating to UBS
                                             Preferred Funding Trust V, UBS
                                             Preferred Funding Trust VI, UBS
                                             Preferred


                                                                             3|7

                                             Funding Trust VII, UBS Preferred
                                             Funding Trust VIII and UBS
                                             Preferred Funding Trust IX,
                                             Noncumulative Trust Preferred
                                             Securities representing a
                                             corresponding amount of
                                             Noncumulative Company Preferred
                                             Securities of UBS Preferred Funding
                                             Company LLC V, UBS Preferred
                                             Funding Company LLC VI, UBS
                                             Preferred Funding Company LLC VII,
                                             UBS Preferred Funding Company LLC
                                             VIII and UBS Preferred Funding
                                             Company LLC IX guaranteed on a
                                             subordinated basis by UBS AG
                                             (Prospectus II);

                           (ii)     a fax copy of our tax ruling request dated
                                    March 23, 2006 and approved by the Swiss
                                    federal tax administration in writing on
                                    March 24, 2006 (Tax Ruling) on:

                                    -        the issuance of debt securities and
                                             warrants by UBS AG acting through
                                             its Jersey branch, London branch,
                                             or such other branch as is
                                             specified in the applicable
                                             prospectus supplement pursuant to
                                             the Prospectus I; and

                                    -        the issuance of trust preferred
                                             securities by UBS Preferred Funding
                                             Trusts V through IX, the issuance
                                             of company common securities and
                                             company preferred securities (the
                                             latter guaranteed on a subordinated
                                             basis by UBS AG) by UBS Preferred
                                             Funding Company LLCs V through IX
                                             and the issuance of subordinated
                                             notes by the Cayman Islands branch
                                             of UBS AG in relation thereto
                                             pursuant to the Prospectus II.

                           No documents have been reviewed by us in connection
                           with this opinion other than those listed above.
                           Accordingly, we shall limit our tax opinion to the
                           above Documents.

                           In this tax opinion, Swiss legal concepts are
                           expressed in English terms and not in their original
                           language. These concepts may not be identical to the
                           concepts described by the same English terms as they
                           exist under the laws of other jurisdictions.



                                                                             4|7

                  II.      Assumptions

                           For the purposes of rendering the tax opinion below,
                           we have assumed that:

                           (a)      all copies, fax copies or electronic
                                    versions of the documents produced to us
                                    conform to the respective original documents
                                    and the originals of such documents were
                                    executed in the manner and by the
                                    individuals appearing on the respective
                                    copies;

                           (b)      all factual information contained in, or
                                    material statements (except as to Swiss law)
                                    given in connection with, the Documents is
                                    true and accurate;

                           (c)      the approval of the Tax Ruling has been
                                    signed by persons of the Swiss federal tax
                                    administration with the requisite signatory
                                    authority conferred on them;

                           (d)      the debt securities and warrants will be
                                    issued by UBS AG acting through its Jersey
                                    branch, London branch, Cayman Islands branch
                                    or such other branch as will be specified in
                                    the applicable prospectus supplement;

                           (e)      the Jersey branch of UBS AG, the London
                                    branch of UBS AG, the Cayman Islands branch
                                    of UBS AG or such other branch as will be
                                    specified in the applicable prospectus
                                    supplement (i) is duly organized and validly
                                    existing under the laws of its respective
                                    jurisdiction, (ii) has the status of a bank
                                    under the laws applicable to it and (iii)
                                    constitutes a permanent establishment
                                    situated and effectively managed outside
                                    Switzerland (inclusive the execution and
                                    performance of the transactions contemplated
                                    under the Prospectus I or the Prospectus II,
                                    and, in each case, the applicable prospectus
                                    supplement);

                           (f)      UBS Preferred Funding Trust V, UBS Preferred
                                    Funding Trust VI, UBS Preferred Funding
                                    Trust VII, UBS Preferred

                                                                             5|7


                                    Funding Trust VIII, UBS Preferred Funding
                                    Trust IX, UBS Preferred Funding Company LLC
                                    V, UBS Preferred Funding Company LLC VI, UBS
                                    Preferred Funding Company LLC VII, UBS
                                    Preferred Funding Company LLC VIII and UBS
                                    Preferred Funding Company LLC IX are duly
                                    incorporated and validly existing under the
                                    laws of their jurisdiction of incorporation
                                    and resident and effectively managed outside
                                    Switzerland (inclusive the execution and
                                    performance of the transactions contemplated
                                    under the Prospectus II and the respective
                                    prospectus supplement);

                           (g)      the proceeds from the sale of debt
                                    securities and warrants are booked and used
                                    outside Switzerland; and

                           (h)      the proceeds from the sale of the trust
                                    preferred securities, the company preferred
                                    securities and the subordinated notes are
                                    booked and used outside Switzerland.

                  III.     Opinion

                           Based on the foregoing and subject to the
                           qualifications set out below, we are of the opinion
                           that as of the date hereof the statements set forth
                           in the Prospectus I and the Prospectus II in each
                           case under the caption "Tax Considerations Under the
                           Laws of Switzerland" insofar as such statements
                           purport to summarize certain tax laws, regulations
                           and regulatory practices of Switzerland, are a
                           correct summary of such laws, regulations and
                           regulatory practices and do not omit to state any tax
                           laws, regulations and regulatory practices necessary
                           in order to make such summary not misleading in any
                           material respect.

                  IV.      Qualifications

                           (a)      We are opining herein as to Swiss tax law
                                    only and we express no opinion with respect
                                    to any other Swiss laws or the laws of any
                                    other jurisdiction.


                                                                             6|7


                           (b)      The Prospectus I and the Prospectus II
                                    provide for the payment of additional
                                    amounts, subject to certain limitations set
                                    forth therein, to the extent (Swiss)
                                    withholding tax is imposed on payments on
                                    the debt securities, warrants, trust
                                    preferred securities, company preferred
                                    securities or subordinated notes. Such
                                    obligations may - if the payments on debt
                                    securities, warrants, trust preferred
                                    securities, company preferred securities or
                                    subordinated notes, as the case may be, are
                                    classified by the Swiss federal tax
                                    administration as made by an entity resident
                                    or situated in Switzerland for Swiss
                                    taxation purposes - violate article 14 of
                                    the Swiss Federal Withholding Tax Act of
                                    October 13, 1965 (the Withholding Tax Act)
                                    which stipulates that (i) Swiss withholding
                                    tax to be withheld from any payment must be
                                    charged to the recipient of the payment, and
                                    (ii) contradictory agreements are null and
                                    void as to this issue. However, the Swiss
                                    federal tax administration has stated with
                                    regard to interest payments that gross-up
                                    provisions are compliant with Article 14 of
                                    the Withholding Tax Act if (i) the borrower
                                    promises a minimum interest rate in the
                                    interest rate clause of the agreement which,
                                    under the condition of imposition of Swiss
                                    withholding tax, is to be adjusted in
                                    correspondence with the tax withheld, (ii)
                                    Swiss withholding tax indeed is calculated
                                    on the basis of the grossed-up net amount
                                    received by the recipient, (iii) the
                                    borrower promises the lender to provide
                                    sufficient documentation potentially
                                    enabling the lender to recover Swiss
                                    withholding tax, and (iv) the parties could
                                    in good faith assume at the time of entering
                                    into the agreement that payments under the
                                    agreement were not subject to Swiss
                                    withholding tax. A Swiss court petitioned to
                                    rule on the validity or enforceability of
                                    the said gross-up provision will, however,
                                    not be bound by the Swiss federal tax
                                    administration's interpretation of article
                                    14 of the Withholding Tax Act.

                                                       * * *


                                                                             7|7


                           We have issued this tax opinion as of the date hereof
                           and we assume no obligation to advise you of any
                           changes that are made or brought to our attention
                           hereafter.

                           We hereby consent to the filing of this opinion as an
                           exhibit to the Registration Statement and to the
                           references to us and the summary of our opinion under
                           the heading "Tax Considerations Under the Laws of
                           Switzerland" in each Prospectus contained in the
                           Registration Statement. In giving such consent, we do
                           not thereby admit that we are in the category of
                           persons whose consent is required under Section 7 of
                           the Act.

                           This opinion is furnished by us, as special Swiss tax
                           counsel to UBS AG, in connection with the filing of
                           the registration of the debt securities, the
                           warrants, the trust preferred securities, the company
                           preferred securities and the subordinated guarantee
                           of UBS (each as defined in the Prospectus I and the
                           Prospectus II), and, except as provided in the
                           immediately preceding paragraph, is not to be used,
                           circulated, quoted or otherwise referred to for any
                           other purpose without our express written permission,
                           or relied upon by any other person.

                           This opinion is governed by and shall be construed in
                           accordance with the laws of Switzerland. We confirm
                           our understanding that all disputes arising out of or
                           in connection with this opinion shall be subject to
                           the exclusive jurisdiction by the courts of the
                           Canton of Zurich, Switzerland.

                           Sincerely yours,

                           HOMBURGER

                           /s/ Dr. Dieter Grunblatt

                           Dr. Dieter Grunblatt