⚠ Educational only.
TaxPlain does not provide tax, legal, or financial advice. Always consult a qualified tax professional about your specific situation.
What this form is
Form 1099-INT reports interest income you earned during the year. Banks, credit unions, brokerages, and other financial institutions send it when they paid you at least $10 in taxable interest.
Think of it as the IRS getting a copy of your savings account earnings. If your bank paid you interest, they report it to both you and the IRS — and the IRS expects to see that income on your tax return.
The most common sources are savings accounts, CDs, money market accounts, Treasury bonds, corporate bonds, and certain tax refunds that earned interest.
Who receives this form
✓ Common Situations
People with savings accounts, high-yield cash accounts, certificates of deposit (CDs), bonds, or brokerage cash balances often receive a 1099-INT each January.
↑ Important
Even if you don't receive a 1099-INT, interest income is still taxable. Small amounts under $10 may not trigger a form, but they still legally must be reported.
📅 When it arrives
Financial institutions usually mail or upload Form 1099-INT by January 31 for the previous tax year. Many banks now provide it electronically through online banking portals.
What each box means
Breaking down the 1099-INT
Most people only need to understand a few boxes. Here's what the main sections actually mean:
Box 1 — Interest income — Regular taxable interest earned from bank accounts, CDs, and similar accounts.
Box 2 — Early withdrawal penalty — Penalties paid for cashing out CDs early. This amount may be deductible.
Box 3 — Interest on U.S. Savings Bonds and Treasuries — Federal taxable interest that is usually exempt from state income tax.
Box 4 — Federal income tax withheld — Backup withholding or taxes already withheld from your interest payments.
Box 8 — Tax-exempt interest — Interest from municipal bonds that is usually exempt from federal income tax.
Box 13 — Bond premium on tax-exempt bond — Adjustments related to municipal bond investments.
State information — Any state taxes withheld from your interest income.
Where this income comes from
1099-INT income is usually passive income earned simply by holding money or fixed-income investments.
Savings accounts — Traditional or high-yield bank savings
Certificates of deposit (CDs) — Fixed-term bank deposits
Treasury securities — Treasury bills, notes, and bonds
Corporate or municipal bonds — Bond interest paid to investors
Brokerage sweep accounts — Cash sitting uninvested in brokerage accounts
IRS or state refunds — Some delayed refunds earn taxable interest
Common mistakes to avoid
⚠ Forgetting Small Accounts
People often forget old savings accounts or online banks. The IRS receives every 1099-INT copy and automatically compares them to your tax return.
⚠ Confusing Tax-Exempt Interest
Municipal bond interest may be exempt from federal tax, but it still usually must be reported on your return even if no tax is owed.
⚠ Missing Treasury Tax Rules
Interest from U.S. Treasury securities is taxable federally but usually exempt from state income taxes. Many people accidentally overpay state taxes.
⚠ Ignoring Backup Withholding
If federal taxes were withheld in Box 4, make sure that amount gets entered into your return or you'll lose credit for taxes already paid.
What to do right now
Gather every 1099-INT from all banks, brokerages, and financial institutions before filing. Compare the forms against your actual accounts so nothing gets missed. If your return is simple, most tax software automatically imports 1099-INT data from major banks. If you own municipal bonds, Treasury securities, or large investment portfolios, consider having a tax professional review the return to avoid state-tax mistakes and missed deductions.
Questions to ask your tax professional
01
Is any of my interest income exempt from state or federal taxes?
02
Did I correctly report tax-exempt municipal bond interest?
03
Can I deduct penalties from early CD withdrawals?
04
Did any backup withholding occur that should reduce my tax bill?
05
Do I need Schedule B because my total interest income exceeds IRS limits?
06
Should I change how my savings or investments are structured for better tax treatment?
Frequently asked questions
Do I pay taxes on all interest income?
Usually yes. Most bank interest is fully taxable federally and often by states too. The main exception is municipal bond interest, which is generally exempt from federal income taxes.
What if I never received my 1099-INT?
You still must report the income. Check your online banking portal or contact the financial institution for a replacement copy. The IRS already received its copy.
Do I need Schedule B with Form 1099-INT?
Usually only if your total taxable interest and ordinary dividends exceed $1,500, or if you have certain foreign accounts or unusual situations.
Is interest from Treasury bonds taxable?
Yes federally, but usually not at the state level. Treasury interest often receives favorable state tax treatment compared to normal bank interest.
Can the IRS catch missing interest income?
Very easily. Financial institutions send the IRS a matching copy of every 1099-INT issued. Missing forms commonly trigger automated IRS notices.