The IRS will accept an amended return up to three years after the date you filed the original return or within two years after you paid the tax due on the return, whichever is later.
Tip: If you filed your 2021 return before the April 18 deadline, the IRS is using the April deadline as the filing date for amendment purposes (for example, if you filed your 2021 return in February of 2022, you'd have until April 18 of 2025 to file the amendment).
Some unusual tax situations, such as net operating loss and general business credit carrybacks or situations involving bad debts, get more time to amend. However, for most people, the deadline to amend a 2018 or earlier return has passed.
