IRS Notices
4464C Letter: Why the IRS Is Reviewing Your Return and Holding Your Refund (2025)
The short answer: a 4464C letter means the IRS pulled your tax return for a review and is holding your refund while it checks the income, withholding, and credits against the records on file. It is not an audit. Most reviews take up to 60 days, and you usually don't need to do anything.
⏱ Your timeline: the IRS typically asks for up to 60 days from the date printed on the 4464C letter to finish its review. If the letter requests documents, send them by the date it gives. If 60 days pass with no refund and no new letter, it's time to call the IRS or the Taxpayer Advocate Service.
Why you got a 4464C letter
You filed a return, you're expecting a refund, and instead of money you got a 4464C letter. Take a breath — this is one of the more routine letters the IRS sends. It means your return was flagged for an "integrity and verification" review. Before the IRS releases your refund, it wants to confirm that what you reported matches the W-2s, 1099s, and other forms that your employers and banks already sent in.
Returns get pulled for this review for ordinary reasons: a number that doesn't yet match a record on file, withholding that looks high relative to income, certain refundable credits, or simply a random accuracy check. Getting a 4464C letter does not mean the IRS thinks you did anything wrong. It means the system wants a closer look before sending the money.
One thing this letter is not: an audit. Nobody is questioning your deductions or asking you to defend your return in an exam. A 4464C is a behind-the-scenes verification — the IRS is doing the checking on its end.
Is a 4464C the same as an identity letter?
No, and this trips people up. A 4464C reviews the accuracy of your return. An identity letter — like a 5071C identity verification letter or a 4883C letter — asks you to prove you're the person who filed before the IRS will process the return at all.
The tell is simple: a 4464C does not ask you to verify your identity online or by phone. If your letter is sending you to an ID verification site or a special phone line to confirm who you are, you're looking at a different letter. Read the letter number in the corner carefully so you respond to the right thing.
What happens while the IRS reviews your return
The frustrating part of a 4464C is that the action is mostly on the IRS's side, and the waiting is on yours. Here's the usual path:
- The review opens. Your refund is held. "Where's My Refund?" may show a generic message that your return is still being processed.
- The IRS verifies your numbers. It compares your reported income and withholding to the forms employers and payers filed. Most of the time, everything matches.
- If it matches: the IRS releases your refund, often with interest added for the delay. No further letter is needed.
- If something doesn't match: you may get a follow-up letter asking for documents, or a notice proposing a change to your return — for example a CP2000 notice if reported income is off. That's a separate process with its own response deadline.
In 2025, refund reviews can run slower than the 60 days the letter promises. IRS staffing is stretched, but the automated review holds stay in place until a human or system clears them. Patience is annoying but normal here — what matters is knowing when patience has run out.
What to do when you get a 4464C letter
Most people don't have to do anything but wait. Still, a few smart moves protect you and shorten the wait:
- Read the letter line by line. Does it ask for documents, or just notify you of the review? If it asks for nothing, you send nothing.
- Gather your records anyway. Keep your W-2s, 1099s, and final pay stubs together in case a follow-up letter asks for proof of income or withholding.
- Confirm your return matches reality. If you pull your own IRS wage and income transcript, you can see exactly what income records the IRS has — and spot a mismatch before the IRS even raises it.
- Watch for scams. A real 4464C arrives by postal mail. The IRS will not email or text you about a refund review or ask for your bank login, gift cards, or a "release fee." There is never a fee to receive your own refund.
- Track your refund. Use the IRS Where's My Refund tool and your IRS online account to watch for updates.
How to respond, step by step
- Confirm the letter number. Make sure it really says 4464C and not an identity letter — your next step depends on which one it is.
- Note the date and count 60 days. Mark your calendar from the date printed on the letter so you know when the normal review window closes.
- Respond only if asked. If the letter requests documents, send copies (never originals) by the deadline and keep proof of what you sent.
- Check your records against your transcript. If your reported income matches the IRS's wage and income data, you have nothing to fix and the refund should clear.
- If 60 days pass with no refund: call the IRS at the number on the letter, or reach the Taxpayer Advocate Service if the delay is causing real financial hardship.
One more thing worth knowing: even if your return is correct, the IRS can apply your refund to a past tax balance or another government debt. If you owe back taxes, your held refund may be used toward that — see whether the IRS will take your refund for back taxes so the outcome isn't a surprise.
Refund stuck behind a 4464C review?
Send us a photo of your letter. An experienced tax professional will tell you whether your return is likely to clear on its own, what a mismatch could cost you, and when it's worth pushing the IRS — free, confidential, no pressure.
4464C letter questions, answered
Is a 4464C letter an audit?
No. A 4464C letter is a return review, not an audit. The IRS is verifying the income, withholding, and credits on your return against the records employers and banks sent in. Nobody is questioning your deductions or asking you to defend your return — the IRS is simply checking the numbers before it releases your refund.
How long does a 4464C review take?
The letter usually says the IRS needs up to 60 days from the date on the notice to finish its review. Many reviews finish sooner, but some run longer if the IRS needs more information. If 60 days pass with no refund and no follow-up letter, it is reasonable to call the IRS or contact the Taxpayer Advocate Service.
Do I need to do anything when I get a 4464C letter?
Usually no. If the letter does not ask for documents, you don't have to send anything — the IRS is reviewing on its own. Just keep your W-2s, 1099s, and last pay stubs handy in case a follow-up letter asks for them. If the letter does request specific documents, respond by the date it gives and keep copies of everything.
Will I still get my refund after a 4464C letter?
In most cases yes. If the IRS confirms your return matches its records, it releases the refund, often with interest for the delay. Your refund could be reduced or held if the review turns up a mismatch, or if you owe back taxes or another government debt that the refund is applied to.
What's the difference between a 4464C and a 5071C letter?
A 4464C is an income and return review — the IRS is checking the accuracy of what you filed. A 5071C is an identity verification letter — the IRS needs to confirm you are the person who filed before it processes the return at all. A 4464C does not ask you to verify your identity online; if your letter does, it is a different letter.
This guide is general information, not tax or legal advice for your specific situation. Eligibility for IRS programs depends on individual facts and circumstances; no outcome is guaranteed.