Every January and February, millions of savers receive a Form 1099-INT from their bank. If your savings account earned $10 or more in interest during the year, this form is how your bank reports that income to you — and directly to the IRS. Knowing how to read it and what to do with it prevents filing errors, missed deductions, and unwanted IRS notices.
Why You Received a 1099-INT
Banks are legally required to issue Form 1099-INT whenever they pay a customer $10 or more in interest during the tax year. Critically, a copy of that form goes straight to the IRS. This means the government already knows your interest income before you file your return. Any discrepancy between your 1099-INT and your Form 1040 will trigger an automated matching notice.
- Below $10 earned: No form is issued, but interest is still taxable — you must self-report it.
- $10 or more earned: Form 1099-INT issued; must be reported on your 1040.
- Over $1,500 total interest: You must also file Schedule B to itemize each source.
Reading the Key Boxes
Most HYSA holders only need to focus on a few boxes:
- Box 1 — Interest Income: Your total taxable interest. This is what gets added to your ordinary income and taxed at your marginal rate.
- Box 2 — Early Withdrawal Penalty: If you broke a CD early, this deductible penalty reduces your taxable income. Do not overlook this.
- Box 3 — U.S. Treasury Interest: Federally taxable but exempt from all state income taxes. Reported separately from Box 1.
- Box 4 — Federal Tax Withheld: If backup withholding was triggered, this is the amount already sent to the IRS on your behalf.
The Math in Action
An investor in the 22% federal bracket living in a state with a 5% state tax rate receives a 1099-INT showing $850 in Box 1.
Of her $850 in interest, she keeps only $620.50. Her effective after-tax yield was 72.9% of her headline rate.
1099-INT Reporting Scenarios
| Situation | Form Received? | Must Report? | Where to Report |
|---|---|---|---|
| Earned $850 from HYSA | Yes — 1099-INT | Yes | Form 1040, Box 2b; Schedule B if >$1,500 total |
| Earned $6 (no form issued) | No | Yes — still taxable | Form 1040, self-reported |
| Broke CD early, Box 2 = $75 | Yes — 1099-INT | Yes (net of penalty) | Deduct Box 2 on Schedule 1, Line 18 |
| Earned T-Bill interest, Box 3 = $400 | Yes — 1099-INT | Federal yes, state no | Form 1040; excluded from state return |
Tax-Season Checklist for Interest Income
- Gather every 1099-INT from every institution before you file.
- Check Box 1 totals against your own account year-end statements.
- Don't forget interest from accounts too small to generate a form.
- Watch the $1,500 threshold — it triggers Schedule B.
- If Box 2 shows a penalty, claim your deduction on Schedule 1.
- Keep all 1099-INTs with your tax records for at least three years.
Knowing your tax bill before it arrives helps you plan. Use the Tax Drag Calculator to estimate how much your HYSA interest will cost you this tax year based on your exact bracket and state rate.
This is general educational information, not tax advice. Tax rules change annually. Consult a qualified tax professional for guidance on your specific return.
Calculate Your Savings After-Tax Yield
Taxes can quietly cut your advertised high-yield savings interest rate by 30% or more. Use our interactive calculator to find your combined marginal bracket, see your true net yield, and visualize your real compounding growth.