The standard rule
You have 3 years from the date you filed the original return (or 2 years from when you paid the tax, if later) to claim a refund via amendment.
If you filed your 2022 return on April 15, 2023, you have until April 15, 2026 to amend it.
If you filed your 2022 return on extension October 15, 2023, you have until October 15, 2026 to amend it.
The "whichever is later" part
The 2-years-from-payment rule matters if you paid tax significantly after filing (e.g., an installment agreement). In that case, the payment date can extend your amendment window.
Example: You filed 2020 in April 2021. In 2023 you paid $8,000 additional tax via installment agreement. You have until 2025 to amend for a refund related to that payment.
Current-year deadlines at a glance (as of April 2026)
| Tax year | Original filing deadline | Amendment deadline for refund |
|---|---|---|
| 2022 | April 18, 2023 | April 18, 2026 (just closed) |
| 2023 | April 15, 2024 | April 15, 2027 |
| 2024 | April 15, 2025 | April 15, 2028 |
| 2025 | April 15, 2026 | April 15, 2029 |
Filing on extension extends the amendment clock by the same amount. If you filed 2023 on October 15, 2024 (with extension), you have until October 15, 2027.
Amending to owe more tax (no deadline)
If your amendment results in more tax owed, there's no statute of limitations on filing. You can always come forward to report additional income or reduced deductions. The IRS has 3 years to assess (or 6 if you omitted 25%+ of income), but you can file any time.
In practice: amending to pay more tax is voluntary compliance. It usually avoids penalties.
When the IRS can come after YOU
- Standard assessment: 3 years from filing
- Substantial understatement (25%+ of income omitted): 6 years
- Fraud or false return: no limit
- Never filed: no limit (clock starts only when you file)
These are IRS audit deadlines, not your amendment deadlines.
Exceptions that extend your refund window
Bad debt or worthless securities
For losses on bad debts or worthless securities, you have 7 years from original filing to amend for a refund.
NOL carrybacks
Most NOL carrybacks are limited (TCJA eliminated most carrybacks starting 2018 with narrow exceptions), but where allowed, you can amend earlier-year returns to apply the loss.
Disaster-related losses
If you're in a federally declared disaster area, you may have expanded timelines and the option to claim losses on the current year or prior year.
Foreign tax credit
10-year statute for refund claims based on foreign taxes paid or accrued.
What happens after the deadline passes
Short answer: the IRS keeps your money.
If you don't file an amendment within 3 years and you were owed a refund, the refund is forfeited. You can still technically file the 1040-X, but the IRS will not issue a refund.
Don't wait for "perfect" — file and let them adjust
If you're unsure whether a specific item qualifies for amendment, err on the side of filing. The IRS will accept or reject individual changes. You can't get a refund you don't ask for, and the 3-year clock is merciless.
How to find out your original filing date
Three ways:
- Your records: the signed 1040 shows a filing date. E-filed returns have a confirmation email from the software.
- IRS transcript: Pull your transcript here — the "Return Transcript" shows filing date.
- Call the IRS: 800-829-1040. They'll give you the filing date after verifying ID.
The 2022 window just closed (mostly)
For calendar-year 2022 returns filed April 15–18, 2023, the amendment window closed April 15–18, 2026. If you filed on extension to October 2023, you have until October 2026.
Pull last year's or two-years-ago return now and check for errors while you still can.
Which years of yours are still amendable?
Upload your returns. We tell you the amendment windows and which errors are still recoverable.