CP 12 Notice
Why did I receive the CP 12 notice?
The IRS sends this notice when they correct one or more mistakes on your tax return, and you end up with more tax refund than the one you expected.
What if I agree with the CP 12 notice?
If you agree with the correction, you don't need to reply to the notice. Just make sure you note the correction on your return for future reference. The IRS will issue a refund in four to six weeks, unless you owe other amounts they are required to collect, such as unpaid tax, penalty, or interest on another tax account.
What if I disagree with the CP 12 notice?
If you can show the IRS you're entitled to a larger refund, you can go ahead and cash the check. You would then respond to the notice with why you should get a larger refund. If they agree, they will issue another check for the additional overpayment six to eight weeks after they correct your account.
If you believe you aren't entitled to the refund check or that you should have received a smaller refund check, then DON'T CASH THE CHECK. Write VOID on the back and return it to the IRS. Call the number included on the notice or write them to explain why the notice you received is incorrect.
If you're entitled to a smaller refund, the IRS will issue another check for the correct amount six to eight weeks after they make the correction. If the correction is simple, such as removing an additional child tax credit they gave you by mistake, just call them at the number printed on the notice with your explanation and they will make the correction on the spot. If the correction is more complicated, such as an error in the calculation of your capital gains tax, it's best to send them an explanation along with a copy of your Schedule D, capital gains worksheet, etc.