Understanding IRS Notice CP23: Estimated Tax Payment Discrepancy — Balance Due and How to Respond
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🔥 The Detangler — Plain English Translation
"The IRS says your estimated tax payments don't add up to what you claimed. Now there's a gap — and they want you to fill it."
CP23 means the IRS's records don't match your claimed estimated payments. This is often a bookkeeping error on either side. Gather your payment documentation immediately before the balance grows.
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Step 1 of 3 — Who are you?
Official IRS Summary
Threat Level & Action
Severity
High
- ✦ Do NOT ignore this notice
- ✦ Respond within the stated deadline
- ✦ Contact a licensed IRS Collection EA
- ✦ Document all communications
- ✦ Review Penalty & Interest exposure
Frequently Asked Questions — CP23
What is IRS Notice CP23?
CP23 is sent when the IRS finds a discrepancy between the estimated tax payments you claimed on your return and what was actually posted to your account — and you owe the difference.
Why would my estimated payments not match?
Common reasons: payments were applied to the wrong tax year, posted late, or one payment wasn't received. Always keep receipts and confirmation numbers for estimated payments.
How do I prove my estimated payments?
Gather bank statements, canceled checks, or IRS.gov account transcripts showing the payment was posted. Submit this documentation with a written dispute.
Will penalty be waived on CP23?
If the discrepancy was due to an IRS posting error, penalties should be abated. An EA can request penalty abatement as part of the resolution.