IRS Notice CP23: How to Correct an Estimated Tax Payment Mismatch

IRS Notice CP23 means the estimated tax payments reported on your tax return do not match the payments posted to your IRS tax account. The Internal Revenue Service adjusted the return to reflect its records, which created or increased a balance due. The notice may also explain other changes made during processing. CP23 is generally a processing adjustment notice rather than an audit notice. However, if you ask the IRS to reverse the adjustment, the IRS may review the issue further or refer it for examination.

Do not assume the IRS record or your filed return is correct until you compare both. A tax payment may leave your bank account but get applied to the wrong tax year, payment type, or taxpayer account. Your review should connect each payment to its date, amount, confirmation number, and intended tax period. That process will show whether you need to contact the IRS or pay the balance.

What Does IRS Notice CP23 Mean?

IRS Notice CP23 informs you that the IRS found a difference between the reported estimated tax payments on your return and the amount it posted to your account. The IRS changed your return to match its tax account records. That change resulted in a balance due, which may include tax, penalties, and interest.

Your tax return may have shown a refund, no balance, or a smaller amount due before the IRS adjusted it. The CP23 notice explains the amount of estimated tax the IRS allowed and the difference it removed. It may also show other changes unrelated to estimated tax payments. Read the notice carefully and compare every adjustment with the copy of your tax return that you kept.

The notice number, tax year, notice date, and identifying details usually appear near the top of the letter. The phone number listed for questions may appear in the upper right-hand corner or in the “Where to find more information” section. Use the number listed on your own notice rather than a general IRS phone number. Have the CP23 notice and tax return in front of you when you call.

IRS Notice CP23 Requires a Payment-by-Payment Comparison

IRS Notice CP23 becomes easier to resolve when you compare each claimed payment with the IRS record. Do not compare only the yearly totals because two payments can have the same amount but different dates, tax years, or payment types. Build a separate line for every payment listed on your tax return.

Detail	What to Compare	What the Difference May Mean
Payment amount	Tax return, bank record, and IRS history	Incorrect entry or missing credit
Payment date	Bank withdrawal and payment confirmation	Posting delay or payment made after filing
Tax year	Direct Pay, EFTPS, or check details	Payment applied to the wrong year
Payment type	Estimated tax, extension, or balance payment	Correct year but wrong tax category
Taxpayer account	SSN, spouse’s SSN, or EIN	Payment posted to another account
Prior-year credit	Prior return and IRS transcript	Refund election missing or entered incorrectly

Start with the estimated tax line on the filed return. List the amount of estimated tax payments claimed, then compare that total with the CP23 notice. Check whether the IRS posted all payments and whether it applied any credits from the prior year. The IRS specifically directs taxpayers to compare these records before they agree with the changes.

From an accounting review standpoint, the strongest comparison does more than show that money left your bank. It also shows where the IRS should have posted that money. A bank statement may prove the payment amount and date, but it may not show the selected tax year. The payment confirmation or IRS transcript can provide the missing details.

Which Records Can Prove Your Estimated Tax Payments?

The best records connect each payment to its amount, date, tax year, payment type, and taxpayer account. One document may not contain every detail, so gather records from several sources. Keep the records in the same order as the payments reported on the tax return. This makes the discrepancy easier to explain.

Gather these records when applicable:

• A complete copy of your filed tax return
• Every page of the CP23 notice
• IRS Direct Pay confirmation numbers
• Existing EFTPS payment records
• Bank statements showing tax payments
• Front and back copies of canceled checks
• Form 1040-ES payment records
• Your IRS tax account transcript
• The prior-year tax return when a refund was applied forward
• Records from your tax preparer or tax professional

Your IRS Online Account can show balances, digital notices, transcripts, pending payments, and up to five years of payment history, including estimated tax payments. An account transcript covers one tax year and may show the payments posted, penalties, interest, and later changes. Compare the online details with your bank records and filed return. A recent payment may not appear immediately, so check the payment date before treating it as missing.

As of July 2026, existing individual EFTPS users can view up to 15 months of payment history. Individuals have been unable to create new EFTPS accounts since October 17, 2025. Current users may continue using EFTPS for now, but the IRS says EFTPS payment options for individuals will be discontinued in late 2026. Most individuals can use IRS Online Account or Direct Pay instead. Tax professionals may still use EFTPS batch tools to make payments for multiple clients.

Payments Posted to the Wrong Year or Account Need Correction

A payment applied to the wrong tax year or account can create a false tax debt even though you sent the money. You need to identify where the IRS posted the payment and where it should have gone. Give the IRS enough information to trace the transaction and correct the tax account.

For example, a creator may report four 2025 estimated tax payments totaling $80,000. The CP23 notice may show only $60,000 because one $20,000 Direct Pay transaction was marked for 2026 estimated tax. The bank record proves the money left the account, while the confirmation record shows the wrong year. The creator should call the toll-free number on the notice and request that the IRS correct the payment posting.

Give the representative these details:

1. The exact payment amount
2. The date the payment cleared
3. The intended tax year
4. The year where the IRS posted it
5. The payment type selected
6. The confirmation or check number
7. The SSN, EIN, or spouse’s SSN used
8. The correction you want the IRS to make

Joint filers should check whether the payment was posted under the secondary spouse’s Social Security number. Creators whose single-member LLC activity is reported on Form 1040 should check whether a personal estimated tax payment was submitted under the LLC’s EIN instead of the owner’s SSN or ITIN. A payment can reach the IRS and still appear outside the correct individual tax account. Your tax professional can help trace the posting when several accounts or payment systems were used.

A Prior-Year Refund Can Cause a CP23 Discrepancy

A prior-year refund may become an estimated tax credit when you elect to apply it to the following year. CP23 can result when the credit reported on the new tax return does not match the amount the IRS applied. Compare the prior-year return, IRS transcript, and current notice before you count that credit.

For the 2025 Form 1040, line 36 records the refund amount a taxpayer wants applied to 2026 estimated tax. Check that entry on your prior-year return and confirm that the same credit appears in the IRS tax account. Do not report a refund as an estimated payment when you requested that money as a direct refund instead. Do not count the same credit twice.

A creator may expect a $15,000 refund to cover part of the next year’s estimated tax. If the filed return requested the full amount as a refund to a bank account, the IRS will not treat it as an estimated tax credit. The new return may then overstate reported estimated tax payments by $15,000. In that case, the CP23 balance may be correct.

How Do You Dispute IRS Notice CP23?

Follow the response date printed on your notice. If you want the IRS to reverse the adjustment, send a written request within 60 days of the notice date. A phone call may resolve a missing or misapplied payment, but a written response helps preserve the formal 60-day reversal request.

Call the number on the notice when the IRS failed to credit a payment or applied it incorrectly. Have your notice, tax return, bank record, canceled check, and payment confirmation ready. Follow up in writing when requested or when you need to document your disagreement.

A written response should state:

• The tax year involved
• The amount you dispute
• The reason you disagree
• The payment date and method
• The intended tax year and account
• The confirmation or check number
• The correction requested
• A list of the attached records

Your explanation could say: “I disagree with the estimated tax payment adjustment on Notice CP23. My tax return reported four payments totaling $80,000, but the notice lists $60,000. The missing $20,000 payment was made on January 10, 2026, for tax year 2025 under confirmation number [number]. Please credit the payment to my 2025 Form 1040 account and update the balance, penalties, and interest.”

Include a copy of the notice when you respond by mail. Send copies of your evidence rather than original bank records or canceled checks. Keep a full copy of the letter and proof of mailing. The Taxpayer Advocate Service states that mailed correspondence may take 30 to 60 days or longer to resolve.

What Should You Do When IRS Notice CP23 Is Correct?

When IRS Notice CP23 is correct, pay the full amount by the due date shown on the notice. The IRS may continue adding penalties and interest until the tax debt is paid. Correct your retained copy of the tax return, but do not send that corrected copy to the IRS.

Do not rely on a standard number of days. The response deadline and payment due date are separate, and both may appear on the notice. If you agree with the adjustment, pay by the printed due date. If you disagree, follow the response instructions and send any formal written request within the applicable 60-day period.

Pay the balance electronically or mail payment according to the notice instructions. If you are unable to pay the full amount, pay as much as possible and review whether you qualify for a payment plan. Interest charges usually continue while a balance remains unpaid. The IRS states that applicable penalties and interest adjust automatically when it later corrects a misapplied payment.

Correct the copy of your tax return that you kept once you agree with the changes. Ask your tax preparer to correct their copy as well. This step helps prevent the same issue during future tax planning or return preparation. The IRS also recommends checking your tax account before filing to confirm that estimated tax payments were applied to the correct year.

Common Creator Mistakes Can Lead to CP23

Creator income may increase quickly, which can lead to large and uneven tax payments during the year. One incorrect entry can create a large difference between the tax return and IRS records. Payment records should stay separate for each amount, date, year, and payment method. This is especially useful when several bank accounts or business entities are involved.

Common mistakes include:

• Entering the wrong total on the estimated tax line
• Reporting a payment that was scheduled but never completed
• Selecting the wrong tax year in Direct Pay
• Choosing a balance payment instead of estimated tax
• Using an EIN for an individual Form 1040 payment
• Making a joint payment under the wrong spouse’s SSN
• Counting a state tax payment as a federal payment
• Reporting a prior-year credit that was never elected
• Losing payment confirmation numbers
• Counting one payment twice
• Failing to give the tax professional complete payment records

The IRS states that the most common cause of CP23 for a person who does not pay estimated taxes is an incorrect entry on the estimated tax line. A posting delay may also explain why a recent payment does not yet reflect in the online account. Review the amount of estimated tax entered before assuming the IRS lost a payment. Then compare the confirmation record with the payments the IRS posted.

FAQs

What does IRS Notice CP23 mean?

IRS Notice CP23 means the estimated tax payments on your return do not match the amount the IRS posted to your account. The IRS changed the return to match its records, which resulted in a balance due. The notice may also explain other changes made while processing the return.

Why did I receive a CP23 notice?

You received a CP23 notice because the IRS found a difference between your reported estimated tax payments or prior-year credits and its records. The discrepancy may come from an incorrect entry, missing credit, wrong tax year, or payment posted to another account. Compare the notice with your return, bank records, payment confirmations, and tax account transcript.

Why did I get CP23 if I do not pay estimated taxes?

You may get CP23 if you do not pay estimated taxes because an amount was entered on the estimated tax line of your return. The IRS identifies an incorrect entry as the most common cause in this situation. Check your filed return and call the number listed on the notice if the entry was wrong.

How do I respond to an IRS CP23 notice?

Compare the adjustment with your tax return and payment records. Pay by the printed due date if the notice is correct, or call the IRS by the response date if you disagree. To request a formal reversal, write within 60 days of the notice date and include records showing the payment amount, date, tax year, method, and account used.

Clear Payment Records Resolve IRS Notice CP23

IRS Notice CP23 usually comes down to where each estimated tax payment was posted. Match every payment to its amount, date, tax year, payment type, taxpayer account, and confirmation number. Dispute the notice within the applicable deadline when your records support the filed return. Pay the balance by the due date when the IRS adjustment is correct. Clear documentation can reduce confusion and help avoid additional penalties and interest.

At The OnlyFans Accountant, we provide tax support built around the financial and compliance needs of OnlyFans creators. We help trace estimated tax payments, compare IRS account records, review CP23 changes, and prepare documentation for payment posting errors. Contact us to schedule a consultation, and we will explain how to securely provide your CP23 notice, filed return, and available payment records.