IRS / Tax Error Code

CP501 | Balance due reminder

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IRS / Tax

Canonical

/irs-tax/error-codes/cp501-notice/

Last Updated

Apr 16, 2026

Summary

CP501 is a balance due reminder notice indicating the IRS believes you have an unpaid amount for a tax year.

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What This Code Means

CP501 is a balance due reminder notice indicating the IRS believes you have an unpaid amount for a tax year.

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