UNITED STATES              ------------------------
                  SECURITIES AND EXCHANGE COMMISSION            OMB APPROVAL
                        WASHINGTON, D.C. 20549          ------------------------
                                                        OMB Number: 3235-0381
                                                        Expires: April 30, 2006
                               FORM 40-F                Estimated average burden
                                                        hours per response...427
                                                        ------------------------
             [_]  REGISTRATION STATEMENT PURSUANT TO
                  SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934
                                  OR
             [X]  ANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF
                  THE SECURITIES EXCHANGE ACT OF 1934


For the fiscal year ended: December 31, 2005   Commission File Number: 001-32677


                          ADVANTAGE ENERGY INCOME FUND
             (Exact name of Registrant as specified in its charter)

                                       N/A
--------------------------------------------------------------------------------
         (Translation of Registrant's name into English (if applicable))

                                     ALBERTA
--------------------------------------------------------------------------------
        (Province or other jurisdiction of incorporation or organization)

                                      1311
--------------------------------------------------------------------------------
    (Primary Standard Industrial Classification Code Number (if applicable))

                                       N/A
--------------------------------------------------------------------------------
                   (I.R.S. Employer Identification Number (if
                                  applicable))

   3100, 150 - 6TH AVENUE SW, CALGARY, ALBERTA, CANADA T2P 3Y7 (403) 261-8810
--------------------------------------------------------------------------------
   (Address and telephone number of Registrant's principal executive offices)

                           CORPORATION SERVICE COMPANY
--------------------------------------------------------------------------------

                1133 AVENUE OF AMERICAS, 31ST FLOOR, NEW YORK, NY
            10036 1-800-927-9800 (Name, address (including zip code)
                   and telephone number (including area code)
                   of agent for service in the United States)

Securities registered or to be registered pursuant to Section 12(b) of the Act.

           Title of each class              Name of each exchange on which
                                                    registered

                                              Toronto Stock Exchange
              Trust Units                     New York Stock Exchange
           -------------------              ------------------------------

Securities registered or to be registered pursuant to Section 12(g) of the Act.

                                      NONE
--------------------------------------------------------------------------------
                                (Title of Class)

Securities for which there is a reporting obligation pursuant to Section 15(d)
of the Act.

                                      NONE
--------------------------------------------------------------------------------
                                (Title of Class)

                 PERSONS  WHO ARE TO RESPOND TO THE  COLLECTION  OF  INFORMATION
SEC 2285 (08-03) CONTAINED IN THIS FORM ARE NOT  REQUIRED TO RESPOND  UNLESS THE
                 FORM DISPLAYS A CURRENTLY VALID OMB CONTROL NUMBER.


     For annual  reports,  indicate by check mark the  information  filed with
     this Form:

      [X]  Annual information form    [X]  Audited annual financial statements

     Indicate the number of outstanding shares of each of the issuer's classes
     of capital or common  stock as of the close of the period  covered by the
     annual report. 57,846,324 Trust Units.

     Indicate by check mark whether the  Registrant by filing the  information
     contained in this Form is also thereby  furnishing the information to the
     Commission  pursuant to Rule 12g3-2(b) under the Securities  Exchange Act
     of 1934 (the  "Exchange  Act").  If "Yes" is  marked,  indicate  the file
     number assigned to the Registrant in connection with such Rule.

                                 Yes [_] 82-_______         No [X]

     Indicate by check mark whether the  Registrant  (1) has filed all reports
     required  to be filed by Section 13 or 15(d) of the  Exchange  Act 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.

                                 Yes [X]                    No [_]





                        DOCUMENTS INCLUDED IN THIS FORM

               The following documents are included in the Form:

      No.                               Document

       1.     Annual  Information  Form of the  Registrant  for the year ended
              December 31, 2005. (filed herein as Exhibit 99.1)

       2.     Consolidated  Financial  Statements  of the  Registrant  for the
              fiscal year ended December 31, 2005;  including a reconciliation
              to US GAAP (Note 15). (filed herein as Exhibit 99.2)

       3.     Consent of KPMG LLP to the  inclusion  of the  Auditors'  Report
              dated  March 7, 2006 on the  Registrant's  Audited  Consolidated
              Financial  Statements  for the fiscal  year ended  December  31,
              2005.

       4.     Comments by KPMG LLP for U.S. readers on Canada - U.S. Reporting
              Differences, dated March 7, 2006

       5.     Consent of Sproule  Associated  Limited to the  incorporation by
              reference  herein of its  Statement  of Reserves  Data and other
              Information  in Form  51-101F1,  which  statement  and report is
              contained in the  Registrant's  Renewal Annual  Information Form
              for the fiscal year ended December 31, 2005.

       6.     CEO  Certification  pursuant to rule  13a-14(a)  of the Exchange
              Act.

       7.     CFO  Certification  pursuant to rule  13a-14(a)  of the Exchange
              Act.

       8.     CEO  Certification  pursuant to U.S.C.  Section 1350, as adopted
              pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

       9.     CFO  Certification  pursuant to U.S.C.  Section 1350, as adopted
              pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.



                                      3


             CONSOLIDATED AUDITED ANNUAL FINANCIAL STATEMENTS AND
                     MANAGEMENT'S DISCUSSION AND ANALYSIS

     A.       AUDITED ANNUAL FINANCIAL STATEMENTS

     For consolidated  audited financial  statements,  including the report of
     independent   chartered   accountants  with  respect  thereto,   see  the
     Consolidated  Financial  Statements of the Registrant for the fiscal year
     ended  December 31, 2005  included  herein.  The  Registrant's  financial
     statements  have been  reconciled  to United  States  generally  accepted
     accounting  principles  ("US  GAAP") as  required  by Form 40-F under the
     Exchange  Act. See Note 15 -  Reconciliation  of Financial  Statements to
     United  States  Generally  Accepted  Accounting  Principles  on  pages 17
     through 20 of such 2005 Consolidated Financial Statements.

     B.       MANAGEMENT'S DISCUSSION AND ANALYSIS

     For management's discussion and analysis, see Management's Discussion and
     Analysis of the  Registrant  for the fiscal year ended  December 31, 2005
     included herein.

                      DISCLOSURE CONTROLS AND PROCEDURES

     As of  December  31,  2005,  an  evaluation  was  carried  out  under the
     supervision of and with the participation of the Registrant's management,
     including the Chief Executive Officer and Chief Financial Officer, of the
     effectiveness of the Registrant's  disclosure controls and procedures (as
     defined  in  Rule  13a-15(e)  under  the  Exchange  Act).  Based  on that
     evaluation,  the Chief  Executive  Officer  and Chief  Financial  Officer
     concluded that as of the end of the fiscal year, the design and operation
     of these disclosure controls and procedures were effective to ensure that
     information  required to be  disclosed  by the  Registrant  in reports it
     files  or  submits  under  the  Exchange  Act  is  recorded,   processed,
     summarized  and reported  within the time periods  specified in SEC rules
     and forms.

     It  should  be noted  that  while the  Registrant's  principal  executive
     officer and principal  financial  officer  believe that the  Registrant's
     disclosure   controls  and  procedures  provide  a  reasonable  level  of
     assurance  that  they  are  effective,   they  do  not  expect  that  the
     Registrant's  disclosure controls and procedures or internal control over
     financial  reporting will prevent all errors and fraud. A control system,
     no matter how well  conceived or operated,  can provide only  reasonable,
     not absolute,  assurance  that the  objectives of the control  system are
     met.  Reference is made in the "Controls and  Procedures" and "Evaluation
     of  Disclosure   Controls  and   Procedures"   sections  of  Management's
     Discussion  and  Analysis  of the  Registrant  for the fiscal  year ended
     December 31, 2005 included herein.


             CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

     During the period  covered by this Annual  Report on Form 40-F no changes
     occurred in the Registrant's  internal  control over financial  reporting
     that has  materially  affected,  or is  reasonably  likely to  materially
     affect,  the  Registrant's  internal  control over  financial  reporting.
     Reference  is  made  in  the  "Evaluation  of  Disclosure   Controls  and
     Procedures"  section  of  Management's  Discussion  and  Analysis  of the
     Registrant for the fiscal year ended December 31, 2005 included herein.


                                      4


                      NOTICES PURSUANT TO REGULATION BTR

     None.


                  CODE OF ETHICS FOR CHIEF EXECUTIVE OFFICER
                         AND SENIOR FINANCIAL OFFICERS

     The Trust has adopted a Code of Ethics for its senior officers, principal
     financial  officer  and  controller  or  principal   accounting  officer,
     directors  and  employees.  This  code  applies  to  President  and Chief
     Executive  Officer,  Senior  Vice-President,   Vice  President  Corporate
     Development,  the  Vice-President,  Finance and Chief Financial  Officer,
     Vice President,  Exploitations,  Vice President Operations, Directors and
     employees.   It  is   available   on  the   Registrant's   web   site  at
     www.advantageincome.com  and in print to any  unitholder who requests it.
     All  amendments to the code,  and all waivers of the code with respect to
     any of the officers covered by it, will be posted on the Registrant's web
     site and provided in print to any unitholder who requests them.

                                AUDIT COMMITTEE

     IDENTIFICATION OF AUDIT COMMITTEE

     The following individuals comprise the entire membership of the Advantage
     Audit  Committee:  Steven Sharpe,  Rodger  Tourigny,  Ronald McIntosh and
     Lamont Tolley.

     AUDIT COMMITTEE FINANCIAL EXPERTS

     Rodger  Tourigny has been  determined  by the board of the  Registrant to
     meet the "audit committee  financial  expert" criteria  prescribed by the
     Securities  and  Exchange  Commission  and has been  designated  as audit
     committee  financial  expert for the Audit  Committee of the board of the
     Registrant.

     Each of the  directors  serving  on the  Audit  Committee  has also  been
     determined by the board of the  Registrant to be  independent  within the
     criteria  established  by the New York  Stock  Exchange,  Inc.  for audit
     committee membership.


                                      5


         PRINCIPAL ACCOUNTING FEES AND SERVICES - INDEPENDENT AUDITORS

     Fees payable to the Registrant's  independent auditor,  KPMG LLP, for the
     years ended December 31, 2005 and December 31, 2004, totaled $320,725 and
     $321,997, respectively, as detailed in the following table. All funds are
     in Canadian dollars.

     --------------------------------------------------------------------------
                             YEAR ENDED DECEMBER 31,    YEAR ENDED DECEMBER 31,
                                       2005                       2004
     --------------------------------------------------------------------------
     AUDIT FEES                      $269,000                  $244,500
     --------------------------------------------------------------------------
     AUDIT-RELATED FEES               $30,000                   $51,000
     --------------------------------------------------------------------------
     TAX FEES                         $21,725                   $26,497
     --------------------------------------------------------------------------
     ALL OTHER FEES                       $ 0                        $0
     --------------------------------------------------------------------------
     TOTAL                           $320,725                  $321,997
     ==========================================================================


     The  nature  of the  services  provided  by KPMG  LLP  under  each of the
     categories indicated in the table is described below.

     AUDIT FEES

     Audit fees were for  professional  services  rendered by KPMG LLP for the
     audit  of the  Registrant's  annual  financial  statements  and  services
     provided  in  connection   with  statutory  and  regulatory   filings  or
     engagements.  These services include  prospectus work and audit or review
     of financials forming part of such prospectus and US GAAP  reconciliation
     matters.

     AUDIT-RELATED FEES

     Audit-related  fees were for  assurance and related  services  reasonably
     related  to the  performance  of  the  audit  or  review  of  the  annual
     statements and are not reported under "Audit Fees" above.  These services
     include French translation in connection with prospectus filing.

     TAX FEES

     Tax  fees  were  for  tax   compliance,   tax  advice  and  tax  planning
     professional  services.  These  services  consisted  of: tax  compliance,
     including  the  preparation  and review of tax  returns;  and general tax
     planning and advisory  services  relating to common forms of domestic and
     international taxation (i.e., income tax, capital tax, goods and services
     tax).

     ALL OTHER FEES

     None.


                                      6


                      PREAPPROVAL POLICIES AND PROCEDURES

     It is within the Advantage's Audit Committee Charter to approve all audit
     and  non-audit  related  fees.  The  Audit  Committee  have  pre-approved
     specifically  identified non-audit  tax-related  services,  including tax
     compliance,  the review of tax  returns,  and tax  planning  and advisory
     services relating to common forms of domestic and international  taxation
     (i.e.  income  tax,  capital  tax,  goods and  services  tax).  The Audit
     Committee  will  be  informed  routinely  as to  the  non-audit  services
     actually provided by the auditor pursuant to this  pre-approval  process.
     The auditors  also  present the  estimate  for the annual  audit  related
     services to the Committee for approval  prior to  undertaking  the annual
     audit of the financial statements.

                        OFF-BALANCE SHEET ARRANGEMENTS

     None.



                                  CONTRACTUAL OBLIGATIONS

                                                   Payments due by period (Cdn$MM)

                                               Less than 1                       More than 5
                                       TOTAL      year      1-3 years  4-5 years    years
                                       -----   -----------  ---------  --------- -----------
                                                                  
     Building Lease                    $3.4       $1.4        $2.0          -          -
     Capital Lease                     $1.8       $0.4        $1.4          -          -
     Pipeline/Transportation           $3.1       $2.4        $0.7          -          -
     Convertible Debentures            $135.1        -        $10.1      $75.3     $49.7
     TOTAL CONTRACTUAL OBLIGATIONS     $143.4     $4.2        $14.2      $75.3     $49.7


                  DISCLOSURES PURSUANT TO REQUIREMENTS OF THE
                            NEW YORK STOCK EXCHANGE

     PRESIDING DIRECTOR AT MEETINGS OF NON-MANAGEMENT DIRECTORS

     The  Registrant   schedules  regular  executive  sessions  in  which  the
     Registrant's  "non-management  directors" (as that term is defined in the
     rules  of  the  New  York  Stock   Exchange)   meet  without   management
     participation. Steven Sharpe serves as the presiding director (the "Chair
     of the Board") at such sessions. Each of the Registrant's  non-management
     directors  is  "independent"  as such  term is used in the  rules  of the
     Canadian Securities Commissions and the New York Stock Exchange Corporate
     Governance Standards.

     COMMUNICATION WITH NON-MANAGEMENT DIRECTORS

     Unitholders may send  communications  to the Registrant's  non-management
     directors by writing to Investors  Relations,  Petro-Canada  Centre, West
     Tower,  Suite  3100,  150 - 6th Avenue SW,  Calgary,  Alberta T2P 3Y7, or
     calling the toll free number at  1-866-393-0393.  Communications  will be
     referred to the Chair of the Board for appropriate  action. The status of
     all  outstanding  concerns  addressed  to the Chair of the Board  will be
     reported to the board of directors as appropriate.


                                      7


     CORPORATE GOVERNANCE GUIDELINES

     According to NYSE Rule 303A.09,  a listed company must adopt and disclose
     a set of corporate governance guidelines with respect to specified topics
     and must disclose any significant ways in which its practices differ from
     those  followed  by US  domestic  companies  under the NYSE  rules.  Such
     guidelines  and  disclosures  are  required  to be posted  on the  listed
     company's website. The Registrant has adopted the required guidelines and
     made  the  required  disclosures,  all  of  which  are  available  on the
     Registrant's  website  at  www.advantageincome.com  and in  print  to any
     unitholder who requests them.

     BOARD COMMITTEE CHARTERS

     Advantage's Audit Committee Charter,  the Terms of Reference of the Human
     Resources,  Compensation and Corporate Governance Committee and the Terms
     of  Reference  for  the  Independent  Reserve  Evaluation  Committee  are
     available    for    viewing    on    the    Registrant's    website    at
     www.advantageincome.com  and are  available  in print to any  person  who
     requests them.  Requests for copies of these documents  should be made by
     contacting:  Investor Relations,  Petro-Canada  Centre, West Tower, Suite
     3100, 150 - 6th Avenue S.W., Calgary, Alberta T2P 3Y7.

                                  UNDERTAKING

     The Registrant  undertakes to make available,  in person or by telephone,
     representatives to respond to inquiries made by the Commission staff, and
     to furnish  promptly,  when requested to do so by the  Commission  staff,
     information relating to: the securities registered pursuant to Form 40-F;
     the  securities  in  relation to which the  obligation  to file an annual
     report on Form 40-F arises; or transactions in said securities.

                         CONSENT TO SERVICE OF PROCESS

     The  Registrant  has  previously  filed with the Commission a Form F-X in
     connection with the Trust Units.

     Any change to the name or address of the agent for  service of process of
     the  registrant  shall be  communicated  promptly to the  Securities  and
     Exchange  Commission by an amendment to the Form F-X referencing the file
     number of the relevant registration statement.


                                      8


                                   EXHIBITS

     The following exhibits are filed as part of this report.


  Exhibit
   Number                       Description

     23.1    Consent  of KPMG LLP to the  inclusion  of the  Auditors'  Report
             dated  March 7,  2006 on the  Registrant's  Audited  Consolidated
             Financial Statements for the fiscal year ended December 31, 2005.

     23.2    Comments by KPMG LLP for U.S. readers on Canada - U.S.  Reporting
             Differences, dated March 7, 2006

     23.3    Consent of Sproule  Associated  Limited to the  incorporation  by
             reference  herein of its  Statement  of  Reserves  Data and other
             Information  in Form  51-101F1,  which  statement  and  report is
             contained in the Registrant's Renewal Annual Information Form for
             the fiscal year ended December 31, 2005.

     31.1    CEO Certification pursuant to rule 13a-14(a) of the Exchange Act.

     31.2    CFO Certification pursuant to rule 13a-14(a) of the Exchange Act.

     32.1    CEO  Certification  pursuant to U.S.C.  Section  1350, as adopted
             pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

     32.2    CFO  Certification  pursuant to U.S.C.  Section  1350, as adopted
             pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

     99.1    Annual  Information  Form of the  Registrant  for the year  ended
             December 31, 2005.

     99.2    Consolidated  Financial  Statements  of the  Registrant  for  the
             fiscal year ended December 31, 2005,  including a  reconciliation
             to US GAAP (Note 15).

     99.3    Management's  Discussion  and Analysis of the  Registrant for the
             fiscal year ended December 31, 2005.


                                      9


                                   SIGNATURE

     Pursuant  to  the  requirements  of  the  Exchange  Act,  the  Registrant
     certifies that it meets all of the  requirements  for filing on Form 40-F
     and has duly caused  this Annual  Report on Form 40-F to be signed on its
     behalf  by the  undersigned,  thereto  duly  authorized,  in the  City of
     Calgary, Province of Alberta, Canada.

     Dated: March 7, 2006

                                     ADVANTAGE ENERGY INCOME FUND


                                    By: /s/ Peter Hanrahan
                                        --------------------------------------
                                        Name:   Peter Hanrahan
                                        Title:  Vice-President, Finance and
                                                Chief Financial Officer of
                                                Advantage Oil & Gas Ltd. on
                                                behalf of Advantage Energy
                                                Income Fund




                                      10