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2017 Publication 501
Jan 2, 2018 Generally, for a credit or refund, you must file Form 1040X within 3 years (including extensions) after the date you filed your original return
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26 U.S. Code 6511 - Limitations on credit or refund
If the claim was not filed within such 3-year period, the amount of the credit or refund shall not exceed the portion of the tax paid during the 2 years
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Time You Can Claim a Credit or Refund
Sep 6, 2023 You cant get a credit or refund if you dont file the claim within 3 years of filing your original return, or 2 years after paying the tax,
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