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Free IRS Tax Tools & CalculatorsUse our free, no-login-required IRS tax tools to understand your tax situation. Offer in Compromise Calculator: estimate what the IRS might accept to settle your tax debt using the official RCP formula. IRS Penalty & Interest Calculator: calculate failure-to-file penalties, failure-to-pay penalties, and daily compounding interest. IRS Notice Decoder: look up any IRS notice or letter to understand what it means, your deadline, and what steps to take. Built by 70+ tax professionals including US Tax Court attorneys, CPAs, and Enrolled Agents at Neil Jesani Tax Resolution. 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