Amend and resubmit a tax return (SA900)
If you need to send an amended return:
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Take a copy of the acceptance receipt from HMRC as confirmation that HMRC has accepted an original filing for this client in the tax year.
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From the Review & File tab, cancel the current submission by selecting Cancel this submission / return.
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Follow the on screen prompts back to the first page on the Review & File tab, to where it says HMRC validation checks have been completed at which point the return is unlocked and ready to be amended.
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Select the Data Input tab if further amendments are required.
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When the return is completed and you are ready to file as an amendment, mark the return as amended.
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For self assessment returns, select the option using the drop-down list found at the bottom of the first data sheet in the Review & File tab, below the green Prepare for filing option.
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Having selected This is an amendment to a previous filing, select Prepare for filing.
If you have activated the amended flagging, Amended return will display as illustrated below: