The basic calculation: multiply your interest rate by your account balance

The tax you owe on savings interest depends on how much interest your bank paid you during the year, not on your account balance. Your bank reports this amount to you and to the IRS on a Form 1099-INT, which arrives by January 31 each year. The interest itself is taxable income — you add it to your other income and pay tax at your ordinary income tax rate, which varies based on your total earnings and filing status.

To understand what you'll owe before the 1099 arrives, multiply your account balance by the annual percentage yield (APY) your bank advertises. If you have $10,000 in a savings account earning 4.5% APY, you'll earn roughly $450 in interest over the year. That $450 is what gets taxed, not the $10,000.

The actual calculation is slightly more complex because interest compounds — your bank adds interest to your balance, then pays interest on that new balance. But for planning purposes, multiplying balance by APY gives you a close estimate of what to expect on your 1099-INT.

Key Takeaways

  • Your bank reports all savings interest on Form 1099-INT by January 31, and that amount is added to your taxable income for the year.
  • Interest is taxed at your ordinary income tax rate, which depends on your total income and filing status, not on a special interest rate.
  • To estimate your tax bill before the 1099 arrives, multiply your account balance by the APY and then multiply that interest amount by your tax bracket percentage.
  • If you earn less than $1,200 in interest across all accounts in a year, your bank may not send a 1099-INT, but you still owe tax on that interest.
  • High-yield savings accounts and money market accounts follow the same tax rules as regular savings accounts.

Finding your tax bracket and calculating what you'll owe

Your tax bracket is the percentage of your income that goes to federal income tax. For 2024, if you file as single and earn between $11,600 and $47,150, you're in the 12% bracket. If you earn between $47,150 and $100,525, you're in the 22% bracket. These ranges change each year and differ based on whether you file as single, married filing jointly, head of household, or another status.

Once you know your bracket, multiply your estimated interest by that percentage. If you expect $450 in interest and you're in the 22% bracket, you'll owe roughly $99 in federal tax on that interest. This is an estimate — your actual tax depends on your total income for the year, because interest pushes you higher in the bracket or into a new one.

You may also owe state income tax on savings interest. Most states tax interest income the same way the federal government does, though a few states (like Tennessee and Texas) do not tax interest at all. Check your state's tax authority website or ask a tax preparer what rate applies to you.

When the IRS requires your bank to report interest

Banks must file Form 1099-INT with the IRS when you earn $10 or more in interest during a calendar year. If you earn $9.99, your bank may not send you a 1099-INT — but you still owe tax on that interest. The IRS expects you to report all interest income, whether or not you receive a form.

If you have multiple savings accounts at different banks, each bank reports only the interest from its own accounts. You receive a separate 1099-INT from each institution. When you file your tax return, you add up all the interest from all your 1099-INTs and report the total on your return.

If you close an account mid-year, the bank reports only the interest earned up to the closing date. Interest stops accruing once the account is closed, so you won't receive additional interest payments after that point.

How interest compounds and affects your tax calculation

Banks calculate interest daily or monthly and add it to your balance. Once interest is added, the next interest payment is calculated on the larger balance — this is compounding. A $10,000 account at 4.5% APY doesn't earn exactly $450; it earns slightly more because of compounding, typically around $459 over a full year.

Your bank does the compounding math for you and reports the exact total on your 1099-INT. You don't need to calculate compounding yourself — the 1099 shows the real number. For planning purposes before the 1099 arrives, using the straightforward multiplication (balance × APY) is close enough to estimate your tax liability.

If you deposit money mid-year or withdraw money mid-year, your interest is lower because your balance was smaller for part of the year. The bank accounts for this automatically in the interest it pays you.

Reporting interest on your tax return

When you file your federal tax return, you report interest income on Schedule B (if you have more than $1,500 in interest) or directly on Form 1040 (if you have $1,500 or less). You list each 1099-INT separately on Schedule B, then transfer the total to your main return.

The interest amount from your 1099-INT goes into the "interest income" line of your return. This is added to your wages, self-employment income, and any other income you earned that year. Your total income determines your tax bracket and how much tax you owe overall.

If you file electronically, tax software walks you through entering each 1099-INT. If you file by hand, you'll need copies of all your 1099-INTs in front of you when you fill out Schedule B or Form 1040.

Interest from CDs, money market accounts, and other savings vehicles

Certificates of Deposit (CDs), money market accounts, and savings accounts all report interest the same way: on Form 1099-INT. The tax treatment is identical. A CD that pays 5% APY is taxed the same as a savings account that pays 5% APY.

If you withdraw money from a CD before the maturity date, you typically pay an early withdrawal penalty. That penalty is not deductible from your taxes — you still owe tax on the full interest amount, even though you paid a penalty to access your money early.

Interest-bearing checking accounts also generate 1099-INTs if the interest exceeds $10. The tax rules are the same.

What happens if you don't receive a 1099-INT

If you earned less than $10 in interest, your bank may not send a 1099-INT. You still owe tax on that interest. Report it on your return even without the form — the IRS has no record of it, but you're legally required to include all income.

If you earned more than $10 and don't receive a 1099-INT by February 15, contact your bank. The bank may have sent it to an old address, or there may be a processing error. Request a corrected form or a statement showing the interest paid.

If your bank fails to send a required 1099-INT and you don't report the interest, the IRS may assess additional tax and penalties if they discover the unreported income during an audit. It's easier to report the interest yourself than to deal with that later.

Frequently Asked Questions

Do I owe tax on interest if I reinvest it back into the account?

Yes. The moment your bank credits interest to your account, it becomes taxable income. Whether you spend it, leave it in the account, or move it to another account doesn't change the tax. You owe tax on the interest in the year it was earned, regardless of what you do with the money.

What if my interest income pushes me into a higher tax bracket?

Your interest is added to your other income, and your total income determines your bracket. If your wages are $50,000 and you earn $2,000 in interest, your taxable income is $52,000. You pay tax on that $52,000 at the rates for your bracket. The interest doesn't get a separate rate — it's taxed as ordinary income.

Can I deduct savings account fees from my interest income?

No. Savings account fees are not deductible. You report the full interest amount on your return, and the fees come out of your own pocket. The IRS does not allow you to reduce reported interest by subtracting fees.

Do I need to report interest if I'm a dependent on someone else's tax return?

Yes. Even if you're claimed as a dependent, you must report your own interest income. Your parent or guardian reports you as a dependent, but you file your own return and report your income. If your interest is your only income and it's below a certain threshold (which varies by year), you may not owe tax, but you still report it on your return.

How do I know if my bank reported the correct amount on the 1099-INT?

Check your monthly statements against the 1099-INT. Add up the interest credited each month — it should match the total on the form. If it doesn't, contact your bank when ready. The bank can issue a corrected 1099-INT (Form 1099-INT with a corrected indicator) before you file your return.