The amendment for 2018 is due today (expires tomorrow) to receive any refund. You have some time for 2019 (expires next April 15th) and 2020, but that's as far as you are allowed to go back and expect a refund.
The IRS will not release any refund after the statute of limitations expires.
- Generally, the statute of limitations for the IRS to assess taxes on a taxpayer expires three (3) years from the due date of the return or the date on which it was filed, whichever is later. A return is considered to be filed on the due date of the return if it was filed on or before its due date.
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