Penalty and interest estimator
Estimate late-filing and late-payment penalties plus IRS interest.
Free calculators
IRS calculators
Estimate penalties and interest, size a payment plan, find your notice deadline and figure self-employment tax. They run in your browser; we never see what you type.
Payment plan calculator
See the monthly payment for an IRS payment plan and the setup fees.
Notice deadline calculator
Find the respond-by date for your notice, with weekends and holidays.
Self-employment tax calculator
Self-employment tax, the deduction and quarterly amounts.