Why Your Estimated Tax Payments May Not Match Your Joint Return?

By Josselyn P. EA May 23, 2026

This is general information regarding U.S. taxes based on current tax laws, 2026. It is important that you consult with your tax professional on your own personal tax situation. 

Got IRS Notice CP23? And you are married filing jointly and you made all your estimated payments during the year on time.  It might  be a simple payment mismatch. 

First verify that the IRS notice is legit. Check your IRS account, both the main taxpayer and spouse should first check their IRS account. 

An IRS Notice CP23 is a notice the IRS sends  when there is a discrepancy between the estimated tax payments shown in the tax return filed and what they actually received.

This is a common issue when estimated tax payments are made under the secondary taxpayer's SSN (the spouse listed on a joint return), the IRS may not automatically match them to the joint return. This is likely the reason why you received the CP23.

The followings are other reasons why this may happen:

• You made an error entering estimated tax payment amounts on your return

• A payment was lost, misapplied, or posted to the wrong tax year

• You claimed a payment on your tax return that wasn't received by the IRS

How to address this issue?

First gather your proof of the payments, bank statement, cancelled checks showing the payments were made. Make sure that when making the estimated payments or balance payments to the IRS to include the SSN. You will need the confirmation numbers if payments were made online via IRS Direct Pay, EFTPS or through your IRS account. Review all the information to confirm that the payments claimed on your return were made for the tax year in question. If what you reported on your tax return is correct and the payments were made under the secondary taxpayer (spouse) then the next step is to contact the IRS. 

It is important to have an IRS account, log in to your account at IRS.gov under the secondary taxpayer’s SSN to confirm the payments are showing there. This can serve as additional evidence. 

Once you determine if the notice is legit, call the number printed on the form CP23 notice or contact your tax accountant to assist you in resolving the issue.  Explain that estimated payments were made under the secondary taxpayer’s SSN and need to be reallocated to the joint return. Make sure to have the documentation ready. 

In most cases a written response is recomended. Send a written response to the address on the notice. Include copies of proof of payments. Keep the originals for your records and only send the copies. Reference that your CP23 notice number, both spouses’ social security number and the tax year in questions. Request that all the payments be applied to the joint return. 

The IRS can trace and reallocate misapplied payments. This is a known and fixable issue. Once corrected, any balance, penalties, or interest shown on the CP23 should be reduced or eliminated.

Again, this is general information regarding U.S. taxes based on current tax laws, 2026. It is important that you consult with your tax professional on your own personal tax situation.