CP23 Notice: Estimated Tax Payments Do Not Match IRS Records

A CP23 arrives when the estimated tax payments you claimed on your return do not match the payments the IRS actually has on your account. The IRS reduced the credit to what it could find, and your account now shows a balance due. For self-employed people, investors and anyone who pays quarterly, this notice is a reminder that the IRS only credits what it can match.

What the IRS did

The IRS compared the estimated tax figure on your return with its records of payments received. Where they differed, it substituted the figure it had. The notice may also reflect other changes made while processing your return. The section "What we changed on your return" lists the lines.

Reconcile your payments

Before you pay or call, build a simple table:

Then compare it with the payments listed on the notice. Check your IRS Online Account, which shows payments and the year each was applied to. Other possible causes of a mismatch include a payment made under the wrong tax year or the wrong taxpayer number, a spouse's payment credited to the spouse's account, a payment that never posted because of a bank issue, or a prior-year overpayment you assumed would carry forward but was refunded or offset.

Your options

1. If the IRS is right, pay the balance by the due date on the notice. The IRS says you can set up a payment plan (installment agreement) if you cannot pay in full. See installment agreements.
2. If a payment was misapplied or missing, call the number on the notice with your return and records, such as cancelled checks or bank statements. The IRS will discuss the issue and give further instructions.
3. If you need to fix your return further, file Form 1040-X.
4. If the numbers are wrong because of a one-time error, update your copy of the return. Do not send it to the IRS.

Estimated tax penalty

Separate from the balance, the IRS may assess a penalty if not enough tax was paid during the year through withholding or estimated payments. Form 2210 computes it. See our estimated tax penalty and estimated taxes guides. Use Form 1040-ES and Publication 505 to adjust payments for the current year.

Interest and the late payment penalty

If you cannot pay in full, a late payment penalty usually applies. If the IRS corrects your account, the penalty and interest adjust automatically. Interest runs until the balance is paid, and the IRS says it cannot reduce interest for reasonable cause or first-time relief, though interest decreases automatically if the tax or penalty is reduced. See IRS interest on unpaid taxes.

Common mistakes

• Reporting estimated payments from memory rather than from bank records.
• Applying the fourth-quarter estimate, normally paid in January, to the wrong year.
• Assuming the IRS will find a payment it did not receive.
• Failing to check your online account before filing next year, which the IRS recommends so you can confirm each payment went to the right year.

When to involve a CPA

If you pay estimated taxes in several states, run a business, or have a joint account with a spouse, a CPA can reconcile payments for you. We can pull transcripts, identify the misapplied payment and prepare a written explanation. With a signed Form 2848, we can contact the IRS for you.

How we can help

Our team prepares estimated tax calculations and tracks payments through the year. If a CP23 arrives, we can reconcile your payments and respond. See our IRS representation services or contact us.

Frequently asked questions

General information only, not tax, legal or accounting advice for your situation. Rules, limits and deadlines change; confirm the current rules with the official source or a qualified professional before you act. Reading this page does not create a professional relationship with CPA Tax Payroll and Accounting Corp.