Overpayment Interest Calculator

Not tax advice. Estimates only — see full disclaimer.

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Estimate interest the IRS may owe you on an overpayment

Overpayment amount

$

Interest start dateThrough date

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3

Each Calculate uses 1 of 3 free runs.

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TaxPenalty.app

Clear IRS penalty and interest estimates — built for taxpayers and tax professionals.

TaxPenalty.app provides estimates only and is not tax, legal, or accounting advice. Results are approximations based on published IRS rules and rates and may not match an IRS assessment. Consult a qualified tax professional before making filing, payment, or abatement decisions. We are not affiliated with the Internal Revenue Service.