Understanding Your CP10 Notice

You can adjust your estimated tax payments with a Form 1040-ES, Estimated Tax for Individuals PDF. For more information, see Publication 505, Tax Withholding and Estimated Tax PDF.

Please contact us at the number listed on your notice for specific information about your tax return.

If you disagree, contact us at the toll-free number shown on the top right corner of your notice, or respond by mail to the address on your notice. If you write to us, include a copy of the notice along with your correspondence or documentation.

We’ll reverse most changes we made if we reduced the refund you requested on your return. However, you must contact us within 60 days from the date of your notice to request the reversal. You don’t need to provide an explanation or additional documents when you request the reversal, but we’ll consider any information you provide us. However, if we don’t receive information that supports your original return, we may forward your case for audit, in which case the audit staff will contact you within 6 weeks to explain the process and your rights. We’re not required to reverse changes we made to the tax withholding or estimated tax payments you reported but will consider the information you provide us.

If you don’t contact us within the 60-day period, changes we made to reduce your refund will not be reversed and you’ll lose your right to appeal our decision in the U.S. Tax Court. Instead, you may file a claim for refund to dispute the changes. Generally, you must submit the claim within 3 years of the date you filed the tax return, or within 2 years of the date of your last payment for this tax, whichever is later.