Did you get a letter from the IRS saying you owe money back on a tax credit you already received? You’re not alone — and you’re not necessarily in trouble. But you do need to act fast.
A tax credit overpayment sounds alarming. What it actually means is straightforward: at some point during the year, you received more credit than your final tax return justified. The IRS calculates the difference and sends you a notice. An overpayment means you paid more tax than you owed — or, in the case of refundable credits, received more credit than you qualified for.
(I got a CP267 notice in February 2023 and panicked. Turned out I’d miscalculated my advance premium tax credit. The fix took one form and about 45 minutes.)
Why Tax Credit Overpayments Happen More Often Than You’d Think
Read more: Earned Income Tax Credit: Complete Guide
Overpayments aren’t rare. They follow predictable patterns tied to how credits are structured and paid.
Generally, an overpayment results from the last tax paid, since there is no overpayment in tax or penalty until the full liability has been settled. That timing gap — between when a credit is paid and when your actual liability is confirmed — is where most overpayments are born.
Here are the most common causes:
- Advance Premium Tax Credit (APTC) reconciliation. If you received advance payments of the premium tax credit for Marketplace health insurance, you must reconcile those payments using Form 8962 when you file your return. If your income rose during the year, you may owe some of that credit back.
- Withholding miscalculations. Tax overpayment often occurs when an employee claims too few exemptions on their W-4 Employee’s Withholding Certificate. Too little withheld means underpayment; too much withheld means overpayment.
- Estimated tax payments that overshoot. If you’re self-employed and your quarterly estimates ran high, you’ve overpaid.
- Life changes mid-year. A job loss, marriage, divorce, or new dependent can shift your credit eligibility after payments have already been made.
What the IRS Notice Actually Tells You — and What It Doesn’t
When the IRS identifies an overpayment, it sends a formal notice. Two of the most common are the CP267 and the CP45.
The CP267 arrives because the deposits or payments applied to your account didn’t agree with what you claimed on your federal tax return. This is different from a CP45, which specifically flags an overpayment situation where your refund was reduced to cover another balance.
A CP45 notice means you paid more tax than you owed during the year — either through paycheck withholding or estimated payments — and you can choose to receive a refund or apply the overpayment to next year’s taxes.
These two notices represent opposite situations. The CP267 typically means you owe more. The CP45 typically means the IRS owes you — or that a credit is being applied.
| Notice | What It Means | Your Action |
|---|---|---|
| CP267 | Payments don’t match your return | Verify, respond within 60 days |
| CP45 | You overpaid; refund reduced | Accept refund or roll over credit |
| Letter 5591 | APTC reconciliation required | File Form 8962 immediately |
The notice will include a response deadline. Missing it can trigger interest accrual and collection actions.
The Key Numbers Behind APTC Overpayment Repayment Caps
Read more: How Tax Credits Are Calculated: Why a $2,000 Credit Doesn’t Always Mean $2,000 Back
If your overpayment involves the Advance Premium Tax Credit, there are repayment caps that limit how much you owe back. These caps depend on your income relative to the federal poverty level.
Use the information from Form 1095-A to complete Form 8962 to reconcile your advance payments of the premium tax credit. The form calculates whether you received too much, too little, or the right amount.
Show the math: How APTC overpayment is calculated
Say you enrolled in a Marketplace plan in January 2025. At enrollment, you estimated your household income at $45,000 for the year — about 193% of the federal poverty level for a family of two.
The IRS calculated your APTC at $420/month, totaling $5,040 for the year. In context: that’s roughly two months of groceries for a family of four.
But you got a raise in July. Your actual 2025 income came in at $58,000 — about 249% of the poverty level.
At that income, your correct annual APTC would have been $3,600. The difference: $1,440 overpaid.
Repayment caps at that income level may limit your repayment obligation. Form 8962 walks you through the exact calculation line by line.
A tax period overpayment comprised of multiple payments or credits is applied to unpaid tax, interest, penalty, or additions to tax for the same tax period. This means the IRS applies your overpaid credit against any other balance you carry — before issuing a refund or demanding cash.
In context: if you owe $800 from a prior year and have a $1,200 overpayment this year, the IRS offsets the $800 automatically. You’d receive $400 back — about three tanks of gas.
Some tax advocates argue that APTC repayment requirements punish people for income volatility they can’t predict. A gig worker whose income swings from $30,000 to $55,000 mid-year has little ability to adjust their Marketplace subsidy in real time. Critics point out that the reconciliation system places the full burden of estimation error on the taxpayer, not the insurer or the exchange. IRS APTC guidance does allow mid-year reporting of income changes — but most enrollees don’t know this option exists until it’s too late.
The 4 Most Common Mistakes That Make Overpayments Worse
Getting an overpayment notice is stressful. These mistakes can turn a manageable situation into a serious one.
1. Ignoring the notice. The IRS sets deadlines on every notice — typically 60 days to respond. Missing the deadline doesn’t make the debt disappear. It starts the clock on interest and potential collection.
2. Assuming the IRS calculation is correct. The CP267 is issued when payments applied to your account didn’t agree with what you claimed. That mismatch might be the IRS’s error, not yours. Always verify against your own records before paying.
3. Not knowing about payment plans. If you can’t pay the full overpayment amount at once, the IRS offers installment agreements. You can request one directly through IRS.gov. A $1,200 overpayment spread over 12 months is $100/month — roughly the cost of a streaming bundle and a dinner out.
4. Skipping Form 8962 entirely. Failing to complete Form 8962 when you’ve received APTC can result in your return being rejected and your eligibility for future premium tax credits being suspended.
Show the math: How IRS interest accrues on an unpaid overpayment balance
Overpayment interest is calculated on the amount owed from the date the overpayment was credited through the date it is refunded or applied.
Example: You owe $1,500 from an APTC overpayment. The IRS federal short-term rate plus 3% — currently around 8% annually — applies to unpaid balances. On $1,500, that’s roughly $120 per year in interest. In context: that’s about two months of a gym membership.
The longer you wait, the more you pay. Responding within 60 days and setting up a payment plan stops additional penalties from layering on top.
Your Step-by-Step Action Checklist When You Receive an Overpayment Notice
Read more: 2026 Tax Refund Status: What the IRS Where’s My Refund Tool Shows You
Don’t let the notice sit on your kitchen counter. Work through this checklist in order.
Step 1: Read the notice completely. Identify the notice type (CP267, CP45, or other), the tax year in question, and the exact dollar amount the IRS claims you owe.
Step 2: Pull your original return and supporting documents. For APTC issues, locate your Form 1095-A from your Marketplace. Use the information from Form 1095-A to complete Form 8962.
Step 3: Verify the IRS math. Cross-check the claimed overpayment against your records. If the IRS number is wrong, you have the right to dispute it in writing within the notice deadline.
Step 4: Choose your repayment path. Options include paying in full at IRS.gov, requesting an installment agreement, or applying any current-year overpayment as an offset.
Step 5: Adjust going forward. If withholding caused the problem, update your W-4 with your employer. If income volatility caused an APTC mismatch, report income changes to your Marketplace mid-year — you can do this at any time.
(Updating my W-4 after a salary bump in 2022 saved me from a nearly identical situation the following April. It took ten minutes online.)
Tax credit overpayments are recoverable situations. The IRS has clear processes, capped repayment amounts in many cases, and payment plan options for those who can’t pay at once. The worst outcome comes from ignoring the notice — not from the overpayment itself.
Bookmark this page and check back after any major income change. We update our IRS notice guidance every quarter.
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