Understanding how long the IRS has to audit your return or assess additional taxes is crucial for knowing when you can safely discard old tax documents and when you might still be at risk.

IRS Statute of Limitations for Tax Returns

Quick Answer

The IRS generally has 3 years from when you filed your return to audit you or assess additional taxes. However, this extends to 6 years if you underreported income by more than 25%, and there's no statute of limitations if you never filed or committed fraud.

Best Answer

Diana Flores, Tax Credits & Amendments Specialist

Taxpayers who filed their returns on time and reported all income accurately

How long does the IRS have to audit your tax return?

For most taxpayers, the IRS has 3 years from the later of your filing date or the tax deadline to audit your return or assess additional taxes. This is called the "statute of limitations" and it's your protection against indefinite IRS scrutiny.

If you filed your 2023 tax return on March 15, 2024 (before the April 15 deadline), the IRS has until April 15, 2027 to audit you — not March 15, 2027. The clock starts ticking from the original deadline, not your actual filing date if you filed early.

Example: When the 3-year clock starts

Let's say you filed your 2025 tax return on February 1, 2026, well before the April 15, 2026 deadline. The IRS statute of limitations doesn't expire until April 15, 2029 — three years from the original deadline, not from when you actually filed.

This same rule applies if you filed an extension. If you got an extension to October 15, 2026 but filed on September 1, 2026, the statute still runs from April 15, 2026 — the original deadline before extension.

When the statute of limitations extends to 6 years

The 3-year rule has a major exception: if you underreported your gross income by more than 25%, the IRS gets 6 years to audit you.

Here's how the 25% test works:

You reported gross income of $80,000 on your return

You actually earned $120,000 (underreported by $40,000)

$40,000 ÷ $80,000 = 50% underreporting

Since 50% > 25%, the IRS has 6 years to audit

This commonly happens with:

Missing 1099s from freelance work or investment income

Unreported cash income from side businesses

Cryptocurrency transactions not properly reported

When there's no statute of limitations

The IRS can audit you forever if:

You never filed a return for that tax year

You filed a fraudulent return with intent to evade taxes

You signed a blank return or someone else prepared a fraudulent return in your name

Fraud is different from simple mistakes or negligence. The IRS must prove you intentionally tried to evade taxes through deception — like claiming fake deductions, hiding income in offshore accounts, or using false Social Security numbers.

What this means for keeping tax records

Based on these rules, here's how long to keep your tax documents:

3 years: Most returns with accurate income reporting

6 years: If you're worried you might have underreported income by 25%+

Forever: If you never filed or there's any question of fraud

The IRS recommends keeping returns and supporting documents for at least 3 years, but 6-7 years is safer if you have any complex income sources.

Key factors that can complicate the statute

Amended returns: Filing Form 1040-X can restart or extend the statute for the items you're amending

IRS agreements: You can voluntarily extend the statute by signing Form 872

Bankruptcy: Filing bankruptcy can suspend the statute of limitations

Living abroad: Time spent outside the US may extend the statute in some cases

What you should do

Keep all tax returns and supporting documents (W-2s, 1099s, receipts, bank statements) for at least 6 years. This gives you protection even if you accidentally underreported income.

If you discover you made an error on a past return, consider whether it's worth amending. Small errors (under $1,000 in additional tax) are often not worth the risk of drawing IRS attention, especially as you approach the 3-year mark.

Key takeaway: The IRS typically has 3 years to audit your return, but this extends to 6 years if you underreported income by more than 25%. Keep tax records for at least 6 years to be safe.

*Sources: [IRC Section 6501](https://www.law.cornell.edu/uscode/text/26/6501), [IRS Publication 556](https://www.irs.gov/pub/irs-pdf/p556.pdf)*

Key Takeaway: Most taxpayers have a 3-year statute of limitations, but keeping records for 6 years protects against the extended statute for underreported income.

Check your past returns →

IRS statute of limitations periods for different scenarios

Scenario	Statute Period	Clock Starts From
Filed return, accurate income	3 years	Original due date or filing date (whichever is later)
Underreported income by 25%+	6 years	Original due date or filing date (whichever is later)
Never filed return	No limit	N/A - can audit anytime
Fraudulent return	No limit	N/A - can audit anytime
Filed extension	3 years	Original due date (not extended date)

More Perspectives

Michelle Woodard, Tax Policy Analyst

Taxpayers who have received IRS correspondence and are concerned about audit risk

Understanding statute of limitations when you've heard from the IRS

Receiving an IRS notice doesn't necessarily mean your statute of limitations has been extended, but it's important to understand what's happening and how it affects your timeline.

Types of IRS notices and statute implications

CP2000 notices (proposed changes based on information returns) don't extend the statute by themselves. You typically have 30 days to respond, and the IRS still needs to assess any additional tax within the normal 3-year window.

Audit notices (Forms 4564, 4549) effectively pause your statute of limitations while the audit is ongoing. The IRS cannot let the statute expire while they're actively examining your return.

Deficiency notices (90-day letters) mean the IRS has already determined you owe additional tax. At this point, they've beaten the statute of limitations and can collect unless you successfully challenge their determination in Tax Court.

When signing agreements extends the statute

Many taxpayers unknowingly extend their statute of limitations by signing IRS forms:

Form 872: Extends the statute by a specific time period

Form 872-A: Extends the statute indefinitely until terminated by either party

Closing agreements: Permanently resolve specific issues but may extend statute for related items

Before signing any IRS agreement, understand exactly how long you're extending the statute and for which tax years.

Protecting yourself during IRS correspondence

If you're dealing with IRS notices:

1. Respond timely to avoid automatic assessments

2. Don't sign extensions unless absolutely necessary

3. Keep detailed records of all IRS communications

4. Consider professional representation to avoid inadvertently extending the statute

The statute of limitations is one of your strongest taxpayer protections — don't give it up without good reason.

Key takeaway: IRS notices don't automatically extend the statute, but audit proceedings and signed agreements can. Protect your statute of limitations by responding carefully to IRS correspondence.

Key Takeaway: IRS notices don't automatically extend the statute, but be careful not to inadvertently extend it by signing agreements during correspondence.

Sources

IRC Section 6501 — Limitations on assessment and collection
IRS Publication 556 — Examination of Returns, Appeal Rights, and Claims for Refund

What is the IRS statute of limitations for tax returns?