IRS Letter 4464C Notice: Return Under Review Before Refund
A Letter 4464C means the IRS is holding your refund while it verifies the return you filed — typically the income, withholding, or credits claimed — for up to 60 days. You usually don't need to do anything, and it is not an audit.
Deadline calculator
The Letter 4464C clock runs from the date printed on the notice — not the day you opened it.
Estimate only, based on the standard 60-day Letter 4464C window. Your notice controls — always use the specific date printed on it.
What a Letter 4464C actually means
The 4464C comes from the IRS's pre-refund verification screens, which cross-check the wages and withholding on your return against what employers actually reported. Returns with early-season filing, large refundable credits, or W-2 income the IRS hasn't matched yet get held most often. It's a screening pause, not an accusation.
Most 4464C holds resolve themselves: the employer's W-2 data arrives, the numbers match, the refund releases. The cases that drag are usually mismatches — a W-2 the employer never filed, withholding that doesn't line up, or an employer that went out of business. That's when the IRS follows up asking for paystubs or other proof, and when having your documentation organized pays off.
How to recognize a real Letter 4464C
It comes from the IRS's Return Integrity Verification Operations (RIVO), which screens refund returns for false income, false withholding, and identity theft. The Internal Revenue Manual lists the 4464C as a "Questionable Refund Hold" letter.
- The IRS describes it as being about "verifying your income and income tax withholding" on a return you recently filed.
- It says the IRS is reviewing the return to make sure income, expenses, and credits are reported accurately. The IRS adds that this doesn't mean you made an error or were dishonest.
- It asks you not to call until 60 days after the letter date, and only if you haven't received your refund or heard from the IRS by then.
- It covers both situations: if you filed the return, no action is needed now; if you didn't file it, the IRS asks for Form 14039, Identity Theft Affidavit.
What to do, step by step
- 1Verify your own numbers first: compare the return's income and withholding against your actual W-2s and 1099s, so you know whether the hold is likely to clear on its own.
- 2Don't send a duplicate copy of your return — the review has to finish either way, and duplicates make it slower. If your own check turns up a genuine error, the IRS says you can correct it with an amended return (Form 1040-X); just don't file one to try to 'push' the review along.
- 3Track status through the Where's My Refund tool and your IRS online account; a transcript showing a refund date beats any phone call.
- 4If 60 days pass with no refund and no further letter, call the number on the letter — and if the delay is causing hardship, the Taxpayer Advocate Service can take the case.
- 5If a follow-up letter asks for paystubs or employer verification, respond quickly and completely — that's the mismatch scenario, and it doesn't resolve without you.
Illustrative example
Example: Two very different 4464C situations
Illustrative scenario: Sam filed his 2025 return on January 28, 2026, claiming a $4,100 refund based on two W-2s. A Letter 4464C dated February 20 arrives. Sam checks his return against both W-2s, finds no errors, notes April 21 (60 days after the letter date) on his calendar, and waits. His refund is released in early April and he never has to call.
His coworker Elena also gets a 4464C, but she hasn't filed a 2025 return yet. That means someone else filed using her information, so she doesn't wait 60 days. She sends Form 14039, Identity Theft Affidavit, as the IRS page instructs, and plans to get an Identity Protection PIN.
Names and numbers are made up to show how this notice typically plays out.
Mistakes that make a Letter 4464C worse
- Waiting 60 days when you never filed the return. The 60-day wait applies only if you filed. If you didn't, send Form 14039 now.
- Calling before 60 days after the letter date. The IRS asks you not to, and calling early won't move your return through the review faster.
- Mixing up a duplicate and a real correction. Sending another copy of the same return doesn't help. If you find an actual error, the IRS page says to review it, ideally with a tax preparer, and correct it with an amended return if needed.
- Treating it as an audit request and mailing documents nobody asked for. If the IRS needs records, it sends a separate request.
What happens if you ignore a Letter 4464C
If you filed the return, doing nothing is usually the right response, because the review continues and the refund is released or the IRS writes again. If you didn't file it, ignoring the letter means the IRS doesn't learn that someone used your identity, which is why it asks for Form 14039.
Common questions
Is a 4464C letter an audit?+
No. It's pre-refund verification — the IRS matching your reported income and withholding against employer filings before releasing money. No records request, no examination. If the IRS later needs documents, it sends a separate letter asking for them specifically.
What's the difference between a 4464C and a CP05?+
Functionally very little — both hold the refund while the IRS verifies the return, and both usually require nothing from you. They come from different IRS review programs, which is why the letters look different. Either way: verify your own numbers, watch your transcripts, and escalate after the stated window passes.
Can I speed up a 4464C review?+
Mostly no — the review runs on the IRS's matching timeline. What helps at the margins: making sure your employer actually filed its W-2s (ask payroll if you suspect trouble), not filing duplicates, and going to the Taxpayer Advocate Service if the hold passes 60 days and is causing genuine financial hardship.
Checked against IRS primary sources — see how we source these guides. You can verify any notice directly at IRS.gov. The dates and instructions printed on your specific notice always control. Official IRS explanation: Understanding your Letter 4464C.
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