How long can the IRS review a tax return?

Asked by: Prof. Joany Schiller  |  Last update: September 9, 2026
Score: 4.6/5 (14 votes)

The IRS generally has three years from the date a tax return is filed (or its due date) to audit it and assess additional taxes, though this can extend to six years for significant errors and indefinitely for fraud or non-filing. Most audits focus on returns filed within the last two years.

How long can the IRS review your refund?

The IRS has no maximum time limit when it comes to processing tax refunds, but after 45 days, it is required to pay interest on your refund. In most cases, you can expect the IRS to issue your tax refund within 21 days of filing your tax return.

What does it mean if the IRS is reviewing your tax return?

The IRS reviews some federal tax returns to determine if income, expenses, and credits are reported accurately. The IRS selects returns for review using various methods; including random sampling, computerized screening, and comparison of information received by the IRS such as Forms W-2 and 1099.

Why is the IRS taking so long to review my tax return?

Processing delays can occur due to identity verification, missing information, or complex return issues. If delays persist beyond typical timelines, consider contacting the Taxpayer Advocate Service for assistance in resolving prolonged processing problems.

How can I speed up my IRS review?

What should I do? Request an expedited refund by calling the IRS at 800-829-1040 (TTY/TDD 800-829-4059). Request a manual refund expedited to you.

How far can IRS go back and audit income taxes

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What triggers an IRS refund review?

The IRS uses a combination of automated and human processes to select which tax returns to audit. Not reporting all of your income is an easy-to-avoid red flag that can lead to an audit. Taking excessive business tax deductions and mixing business and personal expenses can lead to an audit.

How long can the IRS hold your refund for review in 2025?

If the IRS is reviewing your return, it may have questions about your wages and withholding, or credits or expenses shown on your tax return. The review process could take anywhere from 45 to 180 days, depending on the number and types of issues the IRS is reviewing.

Should I be worried if my refund is still being processed?

You generally shouldn't worry if your refund is "still being processed," as it means the IRS is working on it, but it might take longer than the typical 21 days due to common issues like errors, incomplete information, or claiming credits like the EITC/ACTC. Worry only becomes necessary if you receive an IRS letter requesting more information or if the "Where's My Refund?" tool shows a specific problem like fraud, but typically, it just means a longer wait, not no refund at all. 

What is the maximum time for refund processing?

Usually, it takes 4-5 weeks for the refund to be credited to the account of the taxpayer. However, if refund is not received during this duration, the taxpayer must check for intimation regarding discrepancies in ITR; check email for any notification from the IT department regarding the refund.

What is the longest wait for an IRS refund?

The IRS doesn't have a strict maximum time limit for issuing refunds, but generally processes e-filed returns with direct deposit within 21 days, while paper returns take 6 weeks or more, with longer waits for those claiming certain credits (EITC/ACTC) or if errors occur. If the IRS holds your refund for more than 45 days past the tax deadline (or filing date if late), they owe you interest, but significant delays (months) can happen for complex issues or extra reviews, sometimes requiring a mailed notice. 

How long does it take to get your refund after a review?

Processing your refund usually takes: Up to 21 days for an e-filed return. 6 weeks or more for returns sent by mail.

What are common reasons for IRS reviews?

Common IRS audit triggers

  • Making math errors.
  • Failing to report income.
  • Claiming too many charitable donations.
  • Reporting too many losses on a Schedule C.
  • Deducting too many business expenses.
  • Claiming a home office deduction.
  • Using nice, neat, round numbers.

Why would my taxes be under review?

How Tax Returns Are Selected for Review. Tax returns can be selected for review for several different reasons, and not all of them indicate a problem. In many cases, the IRS uses automated systems that flag returns with numbers that fall outside normal patterns for a given income level or filing status.

How long can before the IRS cannot audit me?

The IRS can usually assess tax, by law, within 3 years after your return was due, including extensions, or – if you filed late – within 3 years after we received your return, whichever is later. This time period is called the Assessment Statute Expiration Date (ASED).

How long can the IRS legally take to process a return?

If you file a complete and accurate paper tax return, your refund should be issued in about six to eight weeks from the date IRS receives your return. If you file your return electronically, your refund should be issued in less than three weeks, even faster when you choose direct deposit.

How many times are you allowed to check your refund status?

Due to the large number of inquiries and to avoid service disruptions, the IRS strongly urges taxpayers to check on their refunds only once daily.

What is the longest a refund can take?

Key takeaways. Most people receive refunds within three weeks if they e-file and choose direct deposit; paper returns can take six weeks or more. Filing accurately — especially when claiming credits like the Earned Income Tax Credit— helps prevent refund delays.

Can you sue the IRS for holding your refund?

Generally, if you fully paid the tax and the IRS denies your tax refund claim, or if the IRS takes no action on the claim within six months, then you may file a refund suit. You can file a suit in a United States District Court or the United States Court of Federal Claims.

Why is my return still under processing?

Your refund is still being processed because of errors, incomplete information, suspected identity theft, complex credits (like EITC/ACTC), or a backlog, requiring extra review beyond the typical 21 days, with status updates available on the IRS Where's My Refund tool. Common causes include math errors, missing signatures, mismatched info, or claiming certain credits that trigger extra scrutiny. 

How long does a CP05 review take in the IRS?

We could take up to 60 days to complete this review. Please don't contact us prior to 60 days from the date of this notice since we won't be able to provide you any additional information.

Do all tax returns get reviewed?

The percentage of individual tax returns that are selected for an IRS audit is relatively small. From 2020-2023, less than 0.50% of individual returns were selected for audits — the lowest of any published audit rate since 1950.