A bill to amend the Internal Revenue Code of 1986 to provide for the logical flow of return information between partnerships, corporations, trusts, estates, and individuals to better enable each party to submit timely, accurate returns and reduce the need for extended and amended returns, to provide for modified due dates by regulation, and to conform the automatic corporate extension period to longstanding regulatory rule.

Summary: Tax Return Due Date Simplification and Modernization Act of 2011 - Amends the Internal Revenue Code to change tax return due dates for partnerships (from April 15 to March 15, with extensions until September 15), S corporations (from March 15 to March 31, with extensions until September 30), and C corporations (from March 15 to April 15, with extensions until October 15).

Requires the Secretary of the Treasury, for taxable years beginning after December 31, 2011, to modify by regulation the due dates for extensions of tax returns for partnerships, estates, employee benefit plans, and tax-exempt organizations. Sets a due date of April 15 for the annual information return of a foreign trust with a U.S. owner and for the report of foreign bank and financial accounts (with extensions until October 15).

Extends the automatic extension for corporation income tax returns from three to six months.

SECTION 1. SHORT TITLE; REFERENCE.

    (a) Short Title.--This Act may be cited as the ``Tax Return Due 
Date Simplification and Modernization Act of 2011''.
    (b) Reference.--Except as otherwise expressly provided, whenever in 
this Act an amendment or repeal is expressed in terms of an amendment 
to, or repeal of, a section or other provision, the reference shall be 
considered to be made to a section or other provision of the Internal 
Revenue Code of 1986.

SEC. 2. NEW DUE DATE FOR PARTNERSHIP FORM 1065, S CORPORATION FORM 
              1120S, AND C CORPORATION FORM 1120.

    (a) Partnerships.--
            (1) In general.--Section 6072 is amended by adding at the 
        end the following new subsection:
    ``(f) Returns of Partnerships.--Returns of partnerships under 
section 6031 made on the basis of the calendar year shall be filed on 
or before the 15th day of March following the close of the calendar 
year, and such returns made on the basis of a fiscal year shall be 
filed on or before the 15th day of the third month following the close 
of the fiscal year.''.
            (2) Conforming amendment.--Section 6072(a) is amended by 
        striking ``6017, or 6031'' and inserting ``or 6017''.
    (b) S Corporations.--
            (1) In general.--So much of subsection (b) of 6072 as 
        precedes the second sentence thereof is amended to read as 
        follows:
    ``(b) Returns of Certain Corporations.--Returns of S corporations 
under sections 6012 and 6037 made on the basis of the calendar year 
shall be filed on or before the 31st day of March following the close 
of the calendar year, and such returns made on the basis of a fiscal 
year shall be filed on or before the last day of the third month 
following the close of the fiscal year.''.
            (2) Conforming amendments.--
                    (A) Section 1362(b) is amended--
                            (i) by striking ``15th'' each place it 
                        appears and inserting ``last'',
                            (ii) by striking ``2\1/2\'' each place it 
                        appears and inserting ``3'', and
                            (iii) by striking ``2 months and 15 days'' 
                        in paragraph (4) and inserting ``3 months''.
                    (B) Section 1362(d)(1)(C)(i) is amended by striking 
                ``15th'' and inserting ``last''.
                    (C) Section 1362(d)(1)(C)(ii) is amended by 
                striking ``such 15th day'' and inserting ``the last day 
                of the 3d month thereof''.
    (c) Conforming Amendments Relating to C Corporations.--
            (1) Section 170(a)(2)(B) is amended by striking ``third 
        month'' and inserting ``4th month''.
            (2) Section 563 is amended by striking ``third month'' each 
        place it appears and inserting ``4th month''.
            (3) Section 1354(d)(1)(B)(i) is amended by striking ``3d 
        month'' and inserting ``4th month''.
            (4) Subsection (a) and (c) of section 6167 are each amended 
        by striking ``third month'' and inserting ``4th month''.
            (5) Section 6425(a)(1) is amended by striking ``third 
        month'' and inserting ``4th month''.
            (6) Subsections (b)(2)(A), (g)(3), and (h)(1) of section 
        6655 are each amended by striking ``3rd month'' and inserting 
        ``4th month''.
    (d) Effective Date.--The amendments made by this section shall 
apply to returns for taxable years beginning after December 31, 2011.

SEC. 3. MODIFICATION OF DUE DATES BY REGULATION.

    In the case of returns for taxable years beginning after December 
31, 2011, the Secretary of the Treasury or the Secretary's delegate 
shall modify appropriate regulations to provide as follows:
            (1) The maximum extension for the returns of partnerships 
        filing Form 1065 shall be a 6-month period ending on September 
        15 for calendar year taxpayers.
            (2) The maximum extension for the returns of trusts filing 
        Form 1041 shall be a 5\1/2\-month period ending on September 30 
        for calendar year taxpayers.
            (3) The maximum extension for the returns of employee 
        benefit plans filing Form 5500 shall be an automatic 3\1/2\-
        month period ending on November 15 for calendar year taxpayers.
            (4) The maximum extension for the returns of organizations 
        exempt from income tax filing Form 990 shall be an automatic 6-
        month period ending on November 15 for calendar year filers.
            (5) The due date of Form 3520-A (relating to the Annual 
        Information Return of Foreign Trust with a United States Owner) 
        for calendar year filers shall be April 15 with a maximum 
        extension for a 6-month period ending on October 15.
            (6) The due date of Form TD F 90-22.1 (relating to Report 
        of Foreign Bank and Financial Accounts) for calendar year 
        filers shall be April 15 with a maximum extension for a 6-month 
        period ending on October 15.

SEC. 4. CORPORATIONS PERMITTED STATUTORY AUTOMATIC 6-MONTH EXTENSION OF 
              INCOME TAX RETURNS.

    (a) In General.--Section 6081(b) is amended by striking ``3 
months'' and inserting ``6 months''.
    (b) Effective Date.--The amendment made by this section shall apply 
to returns for taxable years beginning after December 31, 2011.