If the IRS says it changed your return and your refund is different from what you expected, first find the notice number, tax year, notice date and response deadline printed on the letter. Then compare the explanation and revised figures with your filed return and records. The right response depends on the notice: a CP12, a balance-due notice, a CP2000 proposal and a refund-offset notice follow different procedures.
1. Identify the notice and the action it calls for
Look for the notice number, usually near the top of the first page, and read the section describing the change. Do not assume that every letter about a smaller refund is a CP12. Use the deadline and contact details on your own notice; a deadline for one notice type is not a universal IRS deadline.
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| Notice or issue | What it generally means | What to do |
|---|---|---|
| CP12 | The IRS corrected a return, changing the expected refund or creating an overpayment where you expected to owe or break even. | If you agree, generally no reply is required. If you disagree, follow the CP12 instructions to request reversal. |
| CP11 or CP21A | The IRS made a change that leaves a balance due. | Read the specific notice. For CP21A, if you agree, the IRS says to pay by the date printed on the notice. |
| CP2000 | The IRS proposes changes because income or payment information reported by a third party does not match your return. It is a proposal, not a bill, and a response may be required. | Reply by the date listed using the notice’s instructions and response form, if included. State whether you agree and provide supporting documents. |
| Refund offset notice | All or part of an expected refund may have been applied to a debt instead of changing the return itself. | Use the offset notice to identify the receiving agency and dispute the debt application through the route it provides. |
For official descriptions, see the IRS pages for CP12, CP11, CP21A and CP2000. For an offset, the IRS offset guidance explains the distinction.
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Start with the notice’s “what we changed” explanation and any revised calculations. The IRS’s CP12 guidance says to read the notice carefully and compare the changes with the return you filed. Check the specific line or item identified rather than trying to reconcile only the final refund total.
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- Compare the notice with your copy of the filed return and relevant schedules.
- Check records supporting the item at issue, such as income or payment documents that relate to the changed line.
- Keep the notice, return and supporting records together. If you disagree in writing under CP12G/CP12U instructions, include a copy of the notice and relevant correspondence or documentation.
Your IRS Online Account can provide tax records, and some IRS notice pages let you view or download a notice. If a letter seems suspicious, do not rely on instructions or contact details you cannot verify; use the IRS’s official phishing and online-scam reporting guidance to find the appropriate next step.
3. If you agree with the change
CP12
The IRS says you generally do not need to respond if you agree with a CP12 change. The IRS estimates that a refund check will generally arrive in four to six weeks if you do not owe other tax or debts the IRS must collect; this is an estimate tied to CP12 guidance, not a guarantee for every notice or account. Correct your personal copy of the return if needed, but do not send that copy to the IRS.
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CP21A
If you agree with CP21A changes that leave a balance due, the IRS says to pay by the date printed on the notice. Follow that notice’s payment instructions rather than the CP12 no-reply guidance.
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Agreement does not automatically mean that no response is needed. In particular, a CP2000 may require a reply by its stated date even if you agree with the proposed changes. Use the response form and channel specified in that notice.
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4. If you disagree: follow the notice-specific process
CP12: request reversal promptly
For a CP12, contact the IRS using the phone number or mailing address on the notice within 60 days of the notice date to request reversal. Explain which change you dispute and provide records supporting your position. The IRS’s CP12G/CP12U guidance also describes a 60-day period for requesting reversal; your notice’s exact wording and date govern your case.
The IRS warns that not contacting it within the stated period can mean the change will not be reversed through that process and may affect your right to appeal to the U.S. Tax Court. The CP12 guidance describes a refund claim as a possible alternative subject to claim deadlines, but that is not the same as preserving the original appeal path. If the amount or consequences are significant, consider getting qualified tax help promptly.
CP2000: answer the proposal, not the CP12 process
A CP2000 is a proposed change based on information the IRS received from third parties. The IRS says to respond by the date on the notice, indicate whether you agree or disagree, and include supporting documents. Use the response form if one is provided and choose among the submission options listed on your notice, such as upload, fax or mail. The IRS calls the notice a proposal, not a bill; do not ignore a required response while waiting for a refund.
Other codes and letters
For CP11, CP21A or another notice, follow its own deadline, contact route and payment or disagreement instructions. The CP12 60-day procedure should not be assumed to apply to a different notice number.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.5. Check whether the refund was offset for a debt
A smaller payment can result from an adjustment to the return or from a debt offset. The Bureau of the Fiscal Service sends an offset notice that identifies the original refund, the amount applied and the receiving agency. The IRS says it does not provide details about the underlying debt offset; follow the offset notice to challenge the debt application with the appropriate agency.
The IRS says to contact it about an offset only if the refund amount shown on the Bureau of the Fiscal Service notice differs from the amount on your return. If a joint refund was reduced to pay a spouse’s debt, injured spouse relief may be available; eligibility is not automatic.
6. Get help if you need representation
You can authorize someone to represent you or to inspect or receive confidential tax information. Confirm that any representative has the authorization required for the help you want. The IRS also points taxpayers to Low Income Taxpayer Clinics; check eligibility and local availability directly, since a clinic may not be able to take every case.
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This guidance concerns federal IRS notices. State tax agencies use their own notices, deadlines and procedures, so a state refund adjustment should be handled using the instructions from that agency.
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