You cannot amend tax returns more than 3 years old.
This IRS says in this document:
The latest date, by law, you can claim a credit or federal income tax refund for a specific tax year is generally the later of these 2 dates:
- 3 years from the date you filed your federal income tax return, or
- 2 years from the date you paid the tax.
This time period is called the Refund Statute Expiration Date (RSED).
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