How to Use the Savings Interest After Tax Calculator
The APY advertised on your savings account or CD is a pre-tax number. In the U.S., banks report your interest income to the IRS on Form 1099-INT, and it's taxed as ordinary income at your marginal federal (and often state) tax rate — unlike long-term capital gains, which get a preferential rate. That means a "4.5% APY" account might only net you 3% or less after tax, depending on your bracket.
Enter your deposit amount, the annual rate, how many months you're holding it, and your estimated marginal tax rate (federal plus state combined is a reasonable estimate) to see your pre-tax interest, estimated tax owed, and what you actually keep. Because U.S. banks generally don't withhold tax on interest automatically the way some countries do, this estimate is useful for setting aside money ahead of tax season rather than assuming it's already been deducted.
If you're in a high tax bracket, tax-advantaged options like a Roth IRA, a 401(k), or municipal bonds can shelter interest-like income from this bite — but a standard savings account or CD is always fully taxable in the year the interest is earned or credited.
Frequently Asked Questions
Bank and credit union interest is reported to the IRS on Form 1099-INT and taxed as ordinary income, not at the lower capital gains rate. That means it's added to your other income and taxed at your marginal bracket.
No — U.S. banks generally do not withhold tax on interest unless you're subject to backup withholding. You typically owe the tax when you file your return, so it's smart to set aside the estimated amount rather than assume it's already been deducted.
Interest from municipal bonds is generally exempt from federal income tax (and sometimes state tax too), unlike regular bank deposit interest. Regular savings and CD interest is always taxable.