CP321D, CP321M, CP321N, CP321O, CP321P and CP321Q: The IRS Asks You to Recheck a Claim

What a CP321 notice is

The IRS sends CP321 notices after an early look at a return you filed. Each one names the claim or claims that may not match IRS records or the rules for that claim. The IRS pages call it a “potential error” or a “potential discrepancy,” not a final decision.

The IRS pages for these six notices describe no tax change, no amount due and no reply date. Each one asks you to look again and to fix the return yourself if you find a mistake.

This page covers the six CP321 letters that ask you to recheck a claim on a return you already filed.

Which CP321 you got

CP321D: someone else claimed you as a dependent. The IRS page says you did not check the box that says someone else can claim you, and “Our records show someone else claimed you as a dependent.” The page adds that disclosure laws stop the IRS from telling you who claimed you. Our dependent eligibility calculator walks through who can count as someone’s dependent.

CP321M: a Social Security number on the return. The IRS says at least one number on your return “is not valid for employment” in its records. To claim some credits, you, your spouse and your qualifying children need a number that is valid for work, issued before the return’s due date. If that number does not qualify, the IRS page says the IRS may reduce or remove those credits.

CP321N: car loan interest. You claimed the qualified passenger vehicle loan interest deduction on Schedule 1-A of your 2025 Form 1040. The IRS page says the deduction needs the vehicle’s complete 17-character vehicle identification number (VIN), and it can never exceed the interest you paid. The page caps it at $10,000 a year and says your income can lower that limit. The loan must be one you took out after December 31, 2024, to buy a new vehicle for personal use, with a first lien on that vehicle. Lease payments do not count.

CP321O: tips. The IRS says you “may have claimed too much” of the qualified tips deduction on Schedule 1-A of your 2025 return. The page caps the deduction at $25,000 a year, and it phases out when modified adjusted gross income passes $150,000, or $300,000 on a joint return. It counts only tips that appear on a Form W-2, Form 1099-NEC, Form 1099-MISC or Form 1099-K, or that you reported on Form 4137.

CP321Q: overtime. The IRS says you may have claimed too much of the qualified overtime deduction. Only part of your overtime pay counts. The IRS page explains it with time-and-a-half: when your employer pays one and one-half times your regular rate, only the “half” counts. For 2025, employers did not have to report qualified overtime separately on Forms W-2, 1099-NEC and 1099-MISC. If you got no statement of the amount, the IRS page says to use the 2025 Schedule 1-A instructions to figure it.

CP321P: tips and overtime. This notice covers both deductions at once. Check each one against the rules above.

What to do now

Pull out your copy of the return and the notice. Find the one item the notice names, and check it against your records and the rules on the IRS page for your letter.

If the claim is right, the CP321D and CP321M pages say you do not need to send anything. The CP321N, O, P and Q pages ask you to review your 2025 return and to amend it only if you made an error.

If you made a mistake, file an amended return. For CP321N through CP321Q, the IRS pages say you may file the amended return electronically if you filed the original electronically. They also warn that you may need an amended state or local return.

For CP321M, start by comparing each number on the return with the Social Security card. If you typed a number wrong, the IRS page says you do not need to contact the IRS now; just use the right number next year. If the numbers match and the person can work, contact the Social Security Administration to update its records. If the number is not valid for work and you claimed a credit that needs one, amend the return.

For CP321D, read the dependent rules first. If no one else can claim you, you send nothing. If someone else can claim you, amend your return.

Why it pays to fix a mistake now

A CP321 gives you the first move. The pages for CP321N through CP321Q say that if you leave an error in place, the IRS may contact you again. The CP321M page says the same about calls: contact the IRS only if it sends another notice asking for more information.

For tips and overtime, the IRS pages say you may have claimed too much. The tips deduction also requires work in an occupation that customarily and regularly receives tips. The tips deduction counts only tips that appear on one of the listed forms. The overtime deduction counts only the premium part of overtime pay that federal wage law requires, not the whole overtime check.

For the car loan deduction, check two things first: the full VIN on Schedule 1-A, and whether the vehicle qualifies at all. The IRS page says a used vehicle does not qualify, and the vehicle must have had its final assembly in the United States.

What people mistake the CP321 notices for

Many people read a CP321 as an audit. The CP321D page answers that directly: “No, we’re not auditing you at this time.” The other five pages ask you to review the claim; none of them says the IRS has started an examination.

Others read it as a bill. The IRS pages for these notices describe no amount due. A CP2000 works differently: it proposes changes to your tax and asks for a reply by a date. If your notice says CP2000, use that page instead. If it says something else, our guide to IRS letters helps you find what you have.

Some people also think they must call the IRS to say the claim is right. For CP321D and CP321M, the IRS pages say a correct claim needs no reply.

Common Questions