Let’s find a tax preparation office for you


Information regarding browser or device support

Oh no! We may not fully support the browser or device software you are using !

To experience our site in the best way possible, please update your browser or device software, or move over to another browser.

We can help resolve your tax issues. Call (855) 580-9375 today.


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 Senior Vice President and Chief Tax Information Officer for Jackson Hewitt. With over 30 years of experience, he oversees tax service delivery, quality assurance and tax law adherence. Mark is Jackson Hewitt’s national spokesperson and liaison to the Internal Revenue Service and other government authorities. He is a Certified Public Accountant (CPA), holds registrations in Alabama and Georgia, and is an expert on consumer income taxes including electronic tax and tax data protection.

More about Mark Steber Our Editorial Policy

Owe back taxes? Jackson Hewitt® can help.

Start resolving your tax issues today.

When every dollar matters, it matters who does your taxes™


    Our Tax Pros will connect with you one-on-one, answer all your questions, and always go the extra mile to support you.


    We have flexible hours, locations, and filing options that cater to every hardworking tax filer.


    We’ve seen it all and will help you through it all. 40 years of experience and our guarantees back it up.