Code 507 on an IRS transcript is an action code that appears alongside Transaction Code 971, and it means the IRS has placed a hold on your account while it reviews your return before releasing any refund. It is not a denial and not a reversal. Your file has been set aside for a closer look, and the refund you were expecting is paused until that look is finished.
What Code 507 Means
The IRS logs every action on your account with a three-digit transaction code. Code 507 is not one of those standalone transactions. It rides along with TC 971, the code the agency uses to record administrative actions and notices posted to an account.
In IRS Document 6209, the internal reference guide for master file codes, action code 507 is described as “Reserved for financial classification.”1Internal Revenue Service. Internal Revenue Manual Section 8C – Master File Codes The phrasing is vague, but in practice the code marks a return that has been flagged for additional scrutiny before the refund goes out.
Some online sources call code 507 a “refund reversal.” That’s wrong. Actual reversals use different codes: TC 841 for a cancelled refund check, TC 700 for a partial refund correction, TC 807 for an overstated withholding adjustment. If your transcript shows 507, your refund has not been taken back. It’s being held pending review.
Why Your Return Got Flagged
The IRS pulls returns for review to check whether income, withholding, credits, and business income match what other parties reported.2Internal Revenue Service. Understanding Your CP05 Notice A few situations tend to trigger the hold:
- Wages or other income on your return don’t match the W-2s and 1099s employers and financial institutions sent to the IRS.
- You claimed the Earned Income Tax Credit, the Additional Child Tax Credit, or another refundable credit the IRS examines closely because error rates on those credits run high.
- The withholding you reported doesn’t line up with what the IRS has on file from your employers.
- Your deductions, credits, or income look sharply different from your prior years.
Being flagged doesn’t mean you did anything wrong. The IRS reviews millions of returns as routine verification, and plenty come out the other side untouched. It does mean the refund waits until verification is done.
The CP05 Notice and Why You Shouldn’t Call Yet
When this hold posts to your account, you should receive a CP05 notice in the mail. The notice confirms that the IRS is reviewing your return and needs more time.2Internal Revenue Service. Understanding Your CP05 Notice
Here’s the piece that catches people off guard: the CP05 does not ask you to do anything. No documents to send. No phone call to make. The IRS specifically instructs you to wait at least 60 days from the date on the notice before calling, and only then if you still haven’t received your refund or any further mail from the agency.2Internal Revenue Service. Understanding Your CP05 Notice
If the IRS actually needs something from you, it will send a separate follow-up notice spelling out what to provide and by when. Until that happens, the refund sits on hold. Once verification wraps up, one of two things follows: the IRS releases your refund as filed, or it sends a notice proposing changes.
How Long the Hold Lasts
There is no set timeline. Some reviews finish in a few weeks. Others run for months, particularly during peak filing season when the agency is working through tens of millions of returns at once.
Treat the 60-day window from the CP05 as your baseline. If nothing has changed on your transcript and no further mail has arrived after that, calling the IRS is reasonable. Between now and then, you can watch the account yourself by pulling your transcript through your IRS online account. When the hold releases, new codes will post. The one you want to see is TC 846, refund issued. Adjustment codes instead mean the IRS changed something.
If the IRS Proposes Changes
When the review turns up a discrepancy, the IRS sends a notice explaining what it found and how it affects your tax. The most common one is the CP2000, used when third-party income reports don’t match your return.3Internal Revenue Service. Topic No 652, Notice of Underreported Income – CP2000
A CP2000 is a proposal, not a bill. It lays out the amounts you reported next to what was reported to the IRS, identifies the payer and document type, and shows a proposed change to your income and tax.4Internal Revenue Service. Understanding Your CP2000 Series Notice You have 30 days to respond, or 60 if you live outside the United States.3Internal Revenue Service. Topic No 652, Notice of Underreported Income – CP2000
Agree with the changes? Sign the response form that came with the notice and send it back with payment for any additional tax. Disagree? Gather your supporting documents (W-2s, 1099s, receipts, bank statements) and respond in writing before the deadline, explaining why the IRS’s figures are off. Send copies, not originals. Ignoring the notice is the worst move; the IRS will assess the proposed amount automatically and start collection.
What It Costs if You End Up Owing
If the review produces additional tax, interest and penalties run from the original due date of the return, not from the date you get the notice. That’s the surprise for most people, because a review can take months and interest accrues the whole time.
The IRS underpayment interest rate resets quarterly. For the second quarter of 2026, starting April 1, the rate for individual taxpayers is 6%.5Internal Revenue Service. Internal Revenue Bulletin 2026-8 It compounds daily.
The failure-to-pay penalty adds 0.5% of the unpaid tax per month, capped at 25%. It rises to 1% per month once the IRS issues a final notice of intent to levy, and falls to 0.25% per month if you set up an installment agreement.6Internal Revenue Service. Collection Procedural Questions 3 If the IRS decides you were negligent or substantially understated income, it can add an accuracy-related penalty of 20% of the underpayment.7Internal Revenue Service. Accuracy-Related Penalty Penalty abatement is available if you have reasonable cause, such as relying on an incorrect W-2 from your employer.
When to Bring in Help
Most 507 holds resolve on their own once the IRS finishes checking. Some don’t, and some produce proposed changes big enough that you shouldn’t handle them alone.
The Taxpayer Advocate Service is an independent office inside the IRS that helps taxpayers stuck in problems normal channels can’t solve. TAS treats financial hardship as any situation where IRS action has caused or will cause you to fall behind on housing, food, utilities, or transportation. If a held refund is creating that kind of pressure, Form 911 requests TAS assistance. The office asks that you try to resolve the issue through regular IRS channels first.8Taxpayer Advocate Service. Submit a Request for Assistance
Enrolled agents, CPAs, and tax attorneys can pull your transcript directly and represent you at the IRS once you sign a Form 2848 power of attorney.9Internal Revenue Service. Transcript Delivery System (TDS) Paying for that help earns its keep when the proposed adjustment is large, when the IRS is questioning business income, or when a response deadline has already passed and you need to undo the damage.