What This Notice Means
CP10T says the IRS found a miscalculation on your return and corrected it. The correction affects the overpayment you asked the IRS to apply to next year's estimated tax. The notice names the part of the return it changed, such as itemized deductions, and explains why.
One version of CP10T says the IRS could not apply any of your overpayment to next year as you requested, because it had already processed your return for that next year. The IRS can't apply a credit to a tax year whose return has already been filed and processed. When that happens, the notice shows the overpayment as a refund instead.
What's on the Notice
- A summary of the payments you made, the tax you owed, the amount applied to next year, and any refund due.
- Your calculations side by side with the IRS calculations for adjusted gross income, taxable income, and total tax.
- An explanation of each change.
If You Agree
You don't need to respond. If you haven't already received the refund shown, it should arrive within 4 to 6 weeks, as long as you don't owe other tax or debts the IRS is required to collect.
Adjust your estimated tax payments for next year. The credit you planned on may be smaller or gone, and you don't want an underpayment.
If You Disagree
Call the number on your notice to review your account. You can also respond by mail. Fill out the contact information section, detach it, and send it with your explanation and documents. Write your Social Security number, the tax year, and the form number on everything you send.
If the IRS doesn't hear from you, it assumes you agree with the changes.
Practical Points
- Keep the notice with your return for that year.
- If you counted the credit as an estimated payment on next year's return, check your account for that year so you know which payments were actually credited.
- Use certified mail for a paper response and keep copies.
If you received a CP10T and the numbers don't add up, call us at (813) 229-7100.