The CP21A means the IRS made a change to your tax account and the result is a balance due. The adjustment could be from an audit, an amended return you filed, an IRS correction, a penalty assessment, or a credit that was applied or removed.
Understanding the Adjustment
The CP21A shows the type of adjustment, the amount of the change, and your new balance including any penalties and interest. Compare this information to your records. If you recently filed an amended return, the adjustment may reflect the changes you requested. If you were audited, it may reflect the agreed-upon or assessed changes from the examination.
Sometimes the adjustment comes as a surprise. The IRS may have removed a credit you claimed, adjusted income based on information they received, or corrected an error from a prior processing cycle. In these cases, review the adjustment carefully before paying.
If the Adjustment Is Wrong
Contact the IRS at the number on the notice. Explain which part of the adjustment you disagree with and provide documentation supporting your position. You can also respond in writing to the address on the notice. Include the tear-off stub, your explanation, and copies of supporting documents.
If the adjustment resulted from an audit you didn't agree with, you may have appeal rights that were previously described in the audit closure letter. Review your prior correspondence to determine whether administrative appeal or Tax Court petition deadlines are still open.
If the Adjustment Is Correct
Pay the balance to stop penalties and interest from accruing. If you can't pay in full, set up a payment plan. The CP21A balance is treated like any other IRS balance for collection purposes, meaning it follows the same escalation sequence (CP501, CP503, CP504, final levy notice) if you don't address it.
Questions about a CP21A adjustment? Call us at (813) 229-7100.