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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchIf the IRS says it changed your federal income tax return and your refund is different than expected, first find the notice number and the response date printed on that notice. The next step depends on whether it is a CP12 adjustment, a balance-due notice, a proposed CP2000 change, or a notice that your refund was offset for a debt. Compare the notice with your filed return before deciding whether to agree or dispute it.
1. Identify the notice and the action it calls for
Read the notice number, tax year, date, and the section explaining what changed. A phrase such as “refund adjustment” is not enough to identify the process: the notice number and its own instructions determine what to do. The IRS says to use the contact details and deadline on the specific notice.
| Notice or letter | What it generally means | What to check or do |
|---|---|---|
| CP12 | The IRS corrected a return and changed the expected refund, or calculated an overpayment when you expected to owe or break even. | Review the change. If you disagree, contact the IRS using the notice instructions within the stated period. IRS CP12 guidance |
| CP11 or CP21A | A return correction resulted in a balance due. | Read the notice for the amount, payment date, and dispute instructions. For CP21A, the IRS says to pay by the notice date if you agree with the changes. IRS CP21A guidance |
| CP2000 | The IRS is proposing changes because information received from third parties does not match what was reported on your return. It is not a bill, and a response may be required. | Respond by the date on the notice using its form and submission options; state whether you agree and include supporting documents. IRS CP2000 guidance |
| Refund-offset notice | All or part of a refund was applied to a debt, rather than necessarily being removed by a change to the tax return. | Use the offset notice to identify the amount and receiving agency, then follow its instructions to dispute the debt application. IRS refund-offset guidance |
These are federal IRS procedures. State tax agencies have their own notices and deadlines. If your notice code is not listed above, follow the instructions on that notice rather than assuming the CP12 process applies.
2. Compare the IRS calculation with your return
For a CP12, the IRS instructs taxpayers to read the explanation of what changed and compare it with the filed return. Start with the notice’s “what we changed” section, then trace each changed figure to the corresponding line, schedule, or supporting record.
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- Compare the notice with the exact copy of the return you filed, including relevant schedules.
- Check records that support the item in question, such as income or payment information relevant to the changed line.
- Keep the notice, return, schedules, and supporting records together. If you write to the IRS about a CP12, include a copy of the notice and relevant correspondence or documentation.
Your IRS Online Account may provide tax records, and some notice pages let you view or download a notice. If you are unsure whether a letter is genuine, use the IRS’s official tax scams and consumer alerts resource rather than relying on contact information in a suspicious message.
3. If you agree with the adjustment
CP12: usually no reply is needed
The IRS says you do not need to respond if you agree with a CP12 change. It suggests correcting your personal copy of the return; do not send that copy to the IRS. If the adjustment creates a refund, the IRS estimates that a refund check generally arrives in four to six weeks when you owe no other tax or debt the IRS must collect. That is the estimate on the IRS CP12 guidance, not a guarantee for every notice or account.
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CP21A: follow the balance-due instructions
If you agree with a CP21A change that leaves you owing tax, the IRS says to pay by the date printed on the notice. Do not treat this as a CP12 case just because your refund expectation changed; use the notice’s payment and contact instructions.
4. If you disagree with the change
CP12: contact the IRS within the notice period
For a CP12, contact the IRS using the phone number or mailing address on the notice to request reversal. The IRS CP12 guidance gives 60 days from the notice date for this request; the related CP12G/CP12U instructions also describe a 60-day period and request supporting documents. Your specific notice’s wording and date control your case.
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Explain which item you dispute and why, and provide records that support your position. The IRS says that if it does not receive supporting documents, the matter may be sent for audit. The CP12 guidance warns that missing the stated period may mean the change will not be reversed through that process and may affect your right to appeal to the U.S. Tax Court. It describes a refund claim as a possible alternative subject to claim deadlines; that is not the same as preserving the original appeal path. For help applying the rules to your circumstances, consider a qualified tax professional.
CP2000: answer the proposal, not the CP12 process
A CP2000 is a proposed change based on information the IRS received from third parties; it is not a final CP12 adjustment. Reply by the date listed, indicate whether you agree or disagree, and include supporting documents. Use the response form if provided and submit by an option listed on your notice, such as upload, fax, or mail. The IRS’s CP2000 instructions explain the response process.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.5. Check whether the shortfall is a refund offset
A smaller deposit or check can result from a changed return calculation or from a refund being applied to a debt. The Bureau of the Fiscal Service (BFS) sends an offset notice showing the original refund, the amount offset, and the agency that received it. The IRS says it does not provide details about the underlying debt offset. Follow the BFS notice to dispute the debt application; contact the IRS only if the refund amount shown on that notice differs from the amount on your return.
If a joint refund was applied to a spouse’s debt, injured spouse relief may be available. It is a possible avenue, not an automatic entitlement; review the IRS’s offset guidance for the relevant instructions.
6. Get assistance if you need it
You may authorize a representative to act for you or to inspect or receive confidential tax information. The IRS also points taxpayers to Low Income Taxpayer Clinics. Verify a representative’s authorization, and check clinic eligibility and availability directly; neither representation nor clinic assistance guarantees that the IRS will reverse an adjustment. See the IRS information on Low Income Taxpayer Clinics.
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