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1099 INT

What each box on Form 1099-INT means, which interest is taxed by the IRS and your state, and a calculator for the tax on your interest.

Updated November 4, 2026. Free, no sign-up; everything runs in your browser and nothing you type is stored.

1099 INT tax calculator

Box 1 bank/CD interest ($)Box 3 US Treasury and savings bond interest ($)Box 8 tax-exempt (municipal) interest ($)Federal tax rate (%)State tax rate (%)

Estimated tax on interest

–

–Federal tax

–State tax (Treasury interest exempt)

–Federally tax-exempt

1099 INT boxes

Box 1: taxable interest from banks, CDs and bonds, taxed at your ordinary federal and state rates.
Box 2: early withdrawal penalty on a CD, deductible on Schedule 1.
Box 3: interest on US Treasury bills, notes, bonds and savings bonds: federally taxable but exempt from state and local income tax.
Box 8: tax-exempt interest (usually municipal bonds): not federally taxed, but it's reported and counts in provisional income for Social Security taxation.

Banks generally issue a 1099-INT when they pay $10 or more of interest, but you must report all interest even without a form. For Treasury and I bonds, see the savings bond estimator; for whether benefits become taxable, see do you pay tax on Social Security.

Common questions

Is 1099-INT interest taxable?

Box 1 and Box 3 interest are federally taxable; Box 3 Treasury interest is exempt from state tax.

What is the 1099-INT threshold?

Payers generally issue one at $10 or more, but all interest is reportable.

Is municipal bond interest taxable?

Generally not federally, but it counts toward provisional income for Social Security.

Sources

More paycheck and tax calculators: 1099 B · 1099 C · 1099 K Form

General information, not financial, tax or legal advice. Check important numbers with the official source before acting on them.