How Far Back Can the IRS Audit You? Statute of Limitations Explained
Last updated 09/16/2025 by
Ante MazalinEdited by
Andrew LathamSummary:
Quick answer: The IRS generally audits up to 3 years of returns, but it can extend to 6 years if more than 25% of income is omitted and indefinitely in cases of fraud or non-filing. If additional taxes are assessed, you’ll receive balance-due notices like CP14 and follow-ups such as CP501 and CP503.
Many taxpayers assume that after a few years, they are “safe” from an IRS audit. While that’s partly true, there are exceptions. Understanding the audit statute of limitations can help you keep proper records and know when older returns are no longer at risk.
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Standard statute of limitations
The IRS usually has 3 years from the date you filed your return to start an audit. For example, if you filed your 2021 return on April 15, 2022, the IRS generally has until April 15, 2025, to audit it.
When the window extends to 6 years
If you underreport income by more than 25% of the gross amount shown on your return, the statute extends to 6 years. Example: You earned $200,000 but only reported $140,000. That’s a 30% omission, so the IRS has longer to audit.
No statute of limitations
There’s no time limit if:
- You never filed a tax return.
- You filed a fraudulent return.
- You attempted to evade taxes through concealment or misrepresentation.
Audit statute timelines at a glance
| Situation | IRS Audit Window | Example |
|---|---|---|
| Standard filed return | 3 years | Filed April 15, 2022 → Audit deadline April 15, 2025 |
| Underreported income (over 25%) | 6 years | Reported $140k on $200k income → Audit allowed through 2028 |
| No return filed | No limit | IRS can audit anytime if return missing |
| Fraudulent return | No limit | IRS can audit indefinitely if fraud is proven |
What happens if you’re audited after several years?
- The IRS will request older records—keep at least 6 years of tax documents for safety.
- If changes are proposed, you may receive notices like CP11 or CP12 for adjustments, or CP14 for balances due.
- If you disagree, you can appeal through the IRS Office of Appeals.
How long should you keep records?
- 3 years: For most taxpayers with straightforward returns.
- 6 years: If you have business income, self-employment, or risk of underreporting.
- Indefinitely: If you never filed a return or suspect a fraud allegation could arise.
Real-life scenarios
- 3-year audit: A W-2 employee was audited for charitable deductions claimed in 2021. They provided receipts, and the case closed within 4 months.
- 6-year audit: A contractor underreported income by more than 25%. The IRS audited 2016–2021 returns and assessed additional taxes.
- No-limit audit: A taxpayer who failed to file 2015–2017 returns was later pursued in 2023. Since no statute applied, the IRS assessed back taxes and penalties.
Core Takeaways
- The IRS usually audits returns within 3 years of filing.
- Underreporting income by more than 25% extends the audit window to 6 years.
- No statute of limitations applies for fraud or unfiled returns.
- Keep tax records at least 6 years; longer if complex or high risk.
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Next Steps
- Keep at least 6 years of tax records in case of extended audits.
- If you receive a notice, review it carefully and respond on time.
- Consider professional help if older or multiple years are under review.
Related Guides
- What Is an IRS Audit? — Full audit process explained.
- What Triggers an IRS Audit? — Common red flags to avoid.
- IRS Tax Levy vs Tax Lien — Key enforcement tools compared.
- IRS CP14 Notice — First balance-due notice explained.
- How to Talk to the IRS — Best practices for communicating.
Frequently Asked Questions
Can the IRS audit me after 10 years?
Yes, if you didn’t file a return or filed a fraudulent one. Otherwise, audits are capped at 3 or 6 years.
Does the 3-year clock start at filing or the due date?
The statute generally starts at the later of the return due date or the actual filing date.
Do state tax agencies follow the same audit rules?
Not always. Many states mirror the IRS 3-year rule, but some have longer statutes. Check your state’s department of revenue.
What if I lost records for older years?
Reconstruct them with bank statements, employer payroll records, or third-party documents. The IRS accepts reasonable reconstructions if originals are unavailable.
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