What happens when the IRS is reviewing your tax return?

Asked by: Dr. Jonas Huels Sr.  |  Last update: July 7, 2026
Score: 4.7/5 (19 votes)

When the IRS reviews a tax return, they are verifying income, credits, or deductions, often delaying refunds for 45 to 180 days. You will receive a notice (e.g., CP05, CP75) by mail requesting documentation, such as W-2s or expense records. The process may be a simple, automated review or a formal audit, potentially resulting in a refund adjustment or a tax bill.

How long can the IRS hold your refund for review?

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.

Is an IRS review the same as an audit?

You may face an IRS audit after an IRS review. If the IRS reviews your information and detects inaccuracies in your tax returns, it may conduct a comprehensive audit to look into the matter further.

How long does it take the IRS to review a return?

Here's what you can expect in terms of timing. IRS approval: The IRS works to review and approve refunds quickly and efficiently. In fact, historically, more than 9 out of 10 refunds are processed and approved within 21 days of e-file acceptance.

What triggers an IRS review?

Unreported income

The IRS receives copies of your W-2s and 1099s, and their systems automatically compare this data to the amounts you report on your tax return. A discrepancy, such as a 1099 that isn't reported on your return, could trigger further review.

IRS Notice CP05: Oh Crap, the IRS Is Reviewing Your Tax Return

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How long will my refund be in review?

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.

Can I speed up my IRS refund 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.

What are red flags for an IRS 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. The IRS mostly audits tax returns of those earning more than $200,000 and corporations with more than $10 million in assets.

What does it mean when your taxes are under review?

We'll find a professional perfectly matched to your needs. Getting started is easy, fast and free. Match with an advisor. So, what does your tax return being reviewed mean? If your tax return is under review, the IRS is examining it to ensure that it is accurate and in accordance with tax laws.

Why is my tax return taking so long under review?

Some tax returns need extra review for accuracy, completeness, and to protect taxpayers from fraud and identity theft. Returns that fall into this category can take longer to process. Disaster-related returns may take longer to process than tax returns not claiming disaster relief.

What is the $600 rule in the IRS?

The IRS $600 rule refers to a change in reporting requirements for third-party payment apps (like Venmo, PayPal) for taxable income from goods and services, where platforms must send a Form 1099-K if you receive over $600 in a year, intended to capture gig economy/side hustle income, though delays and phased implementation have adjusted the timeline, with current rules for 2024 using a higher threshold ($5,000) before fully phasing to $600 for future years, but remember all taxable income, regardless of form, must always be reported.
 

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.

Why is IRS randomly selected for review?

District offices select returns randomly sometimes for special research programs, but generally the returns are selected because they have good audit potential. The potential is discovered by a computerized system called the Discriminant Function System (DIF). In most cases, the decisionmaker is not the auditor.

What is the IRS review process?

The IRS conducts audits either by mail or through an in-person interview to review your records. The interview may be at an IRS office (office audit) or at the taxpayer's home, place of business, or accountant's/representative's office (field audit). Remember, you will be contacted initially by mail.

How do you know if the IRS is investigating you?

You know the IRS might be investigating you through official mail (first contact), phone calls (often with automated messages to IRS.gov), or in-person visits, but signs of a criminal probe include contact with IRS Criminal Investigation (CI) agents, subpoenas to you or your bank, questions to your accountant/bank, unusual account activity (freezing/refusing transactions), or agents suddenly going silent after an audit. Key indicators are official IRS letters, contact from CI special agents, third-party inquiries, and formal summonses for records, signaling serious scrutiny beyond a simple audit. 

What are the 5 stages of audit?

What happens during an audit? Internal audit conducts assurance audits through a five-phase process which includes selection, planning, conducting fieldwork, reporting results, and following up on corrective action plans.

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.

What does it mean if the IRS is reviewing my refund?

Why is my return being reviewed? (updated Aug. 7, 2024) While we accept most tax returns as filed, we select some for review. The IRS reviews some federal tax returns to determine if income, expenses, and credits are reported accurately.

How long is the IRS allowed to review your tax return?

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).

What happens when your tax return is under review?

During the review process, the IRS will verify several key aspects of your tax return, which can include: The accuracy of your reported income. Tax withholding amounts shown on your documentation. Tax credits that you claimed during filing.

What qualifies as an IRS hardship?

IRS hardship reasons generally fall into two categories: 401(k) hardship withdrawals for "immediate and heavy financial needs" (like medical bills, home purchase/foreclosure prevention, funeral costs, or education) and tax debt hardship (inability to pay taxes due to inability to meet basic living expenses, long-term unemployment, or disability). For retirement plans, the IRS provides "safe harbor" reasons, including unreimbursed medical expenses, principal residence purchase/repair/foreclosure prevention, funeral expenses, and postsecondary education costs, plus expenses from FEMA-declared disasters.
 

Does the IRS make mistakes on refunds?

Refunds lower because of mathematical errors

Your tax refund may be lower because of a mistake on your tax return. If that happens, the IRS will correct the return. The agency should send you a letter explaining why the amount is different from what you expected.