Filing an Amended Business Tax Return - Your Questions Answered

When to File, Where to File, What Form to Use for an Amended Business Tax Return

Filing an Amended Business Tax Return
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When Must I File an Amended Business Tax Return? 

You must file an amended business tax return if: 

  • You made a substantial error on your return, one that will affect your tax liability.
  • You received new information that needs to be included.

You DON'T need to file an amended return if: 

  • Your errors were just math errors. The IRS will make the changes.
  • You forgot to attach tax forms. The IRS will ask for these. 

    What's the Deadline for Filing an Amended Business Tax Return? 

    In general, the IRS says you must file the form within three years from the date you filed your original return or with two years from the date you paid the tax, whichever is later.

    Filing an amended business tax return should be done as soon as you discover the error:

    • If you must pay more taxes, file the amended return as soon as possible to avoid fines and penalties.
    • If you are due a refund as a result of the amended return, you have three years from the date you filed your original return to claim the refund.

    What Form Do I Use for an Amended Business Tax Return? 

    If you need to amend your business tax return, follow the procedure outlined below. Where and how to file an amended return depends on your business type:

    Sole Proprietor or Single-Member LLC

    For a sole proprietor or single-member LLC filing an amended return on Form 1040x.

    This form includes changes to Schedule C.

    • Where to File: You cannot e-file an amended return. Send the return, along with any schedules that changed, to the appropriate address on Page 4 of the Instructions for Form 1040x.
    • When to File: You must wait until the original return has been filed before you file an amended return. For a credit or refund, you must file within 3 years (including extensions) after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.

      Corporation 

      For a corporation filing an amended return on Form 1120x:

      • Where to File: Send the return, along with any schedules that changed, to the address where you filed your original corporate tax return. You can find this address on Page 3 of the Instructions for Form 1120.
      • When to File: You must wait until the original return has been filed before you file an amended return. For a credit or refund, you must file within 3 years (including extensions) after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.

      Partnership or Multiple-member LLC

      For a partnership or multiple member LLC filing an amended return on Form 1065:

      • Where to File: You cannot e-file an amended return. Send the return, along with any schedules that changed, to the address where the original return was filed. You can find this address on the Instructions for Form 1065.
      • When to File: You must wait until the original return has been filed before you file an amended return. For a credit or refund, you must file within 3 years (including extensions) after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.

        S Corporation

        For an S corporation filing an amended return on Form 1120s:

        • Where to File: You cannot e-file an amended return. Send the return, along with any schedules that changed, to the address where the original S corporation tax return was file. You can find the appropriate address on Page 3 of the Instructions for Form 1120s.
        • When to File: You must wait until the original return has been filed before you file an amended return. For a credit or refund, you must file within 3 years (including extensions) after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.

        For more information on how to complete the correct amended tax return, and how to check on your amended return, see this article about How to File and Check On an Amended Business Tax Return. 

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