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What is a CP23 notice?

Mark Steber Chief Tax Information Officer Published On June 22, 2020


IRS notices are letters sent to inform taxpayers of important tax information. Each one is different, but we can explain what the CP23 is about.

Understanding your CP23 notice

There was a difference between the amount of estimated taxes paid reported on your tax return and the amount of payments posted to your account.  After making the corrections, the IRS has determined you owe additional taxes. This notice may also cover some other changes found during the processing of your return.

Type of Notice

Mistakes have been found on your return, including the amount of estimated payments posted to your account.

Why you received the CP23 notice

You received a CP23 notice because there was a mistake in the amount of estimated payments reported on your tax return. Therefore, you have a balance due because of the changes.

Likely next steps

As always, carefully read the notice, which will outline the changes that the IRS made to your return and the amount of money you owe.

If you agree with the notice, you should make those changes to your tax return you keep for your records. Then, you need to either pay the balance due by the due date or set up a payment plan.

If you disagree with the notice, you need to contact the IRS at the toll-free number listed on the CP23 in the top right-hand corner or via mail within 60 days.

You can also contact a tax professional to learn more about your options.

CP23 Notice deadline

There will be a due date on the CP23 notice and you need to pay the tax balance by that date.

If you miss the deadline

If you do not settle your tax debt by the due date on the CP23 notice, you will accrue penalties and interest.

About the Author

Mark Steber is Chief Tax Information Officer, responsible for key initiatives that support overall tax service delivery and quality assurance. Mark also serves as a Jackson Hewitt liaison with the Internal Revenue Service, states, and other government authorities. With over 30 years of tax experience and deep knowledge of the federal and state tax codes, Mark is widely referenced as an expert on consumer income tax issues, especially electronic-tax and data-protection issues.

View Mark's LinkedIn Profile Jackson Hewitt Editorial Policy

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