The short answer: taxable interest goes on Form 1040 line 2b, and tax-exempt interest goes on line 2a for information only. Those are the 2025 line numbers, so check the form for your own tax year. Below, we cover whether every payment counts, what to do with a 1099-INT or a missing one, and when Schedule B comes in. Australians with US accounts, bonds or filing obligations will find the steps below useful.
Key Takeaways
- Report taxable interest from every source, even without a Form 1099-INT.
- Total your 1099-INT, 1099-OID, brokerage and bank records, then reconcile them.
- Tax-exempt interest goes on line 2a and stays out of taxable interest.
- Schedule B depends on the $1,500 threshold and on special triggers.
- Foreign accounts add separate disclosures beyond income reporting.
What Counts as Interest Income?
Common examples
Interest is what you earn for lending money, directly or through a bank. Typical sources:
- Savings and checking accounts, money market accounts and CDs
- Credit union "dividends" (these are interest)
- Corporate bonds and US Treasury bills, notes and bonds
- Seller-financed or private loans
- Insurance dividends left on deposit
Dividends from stocks and money market mutual funds are a different category, reported on lines 3a and 3b. Gains from selling securities go through Form 8949 and Schedule D. Per IRS Topic 403, Treasury interest is federally taxable.
Taxable versus tax-exempt
Taxable interest raises your federal taxable income. Interest on certain state and local government bonds is exempt from regular federal income tax. It still gets reported on line 2a.
Exempt does not mean irrelevant. Tax-exempt interest counts in the Social Security benefit calculation, and interest on specified private-activity bonds can enter the alternative minimum tax (AMT).
Documents to collect
- Form 1099-INT and Form 1099-OID
- Consolidated brokerage statements
- Bank statements and bond records
- Statements from foreign banks
- Your own records for interest paid without a form, such as private loans
How to Report Interest Income on Form 1040
Step 1: Review every document
Form 1099-INT boxes tell you where each amount belongs:
| Box | What it shows |
|---|---|
| 1 | Taxable interest |
| 2 | Early-withdrawal penalty |
| 3 | Savings bond and Treasury interest |
| 4 | Federal tax withheld |
| 8 | Tax-exempt interest |
| 9 | Specified private-activity bond interest |
| 11–13 | Bond premium (taxable, Treasury, tax-exempt) |
Form 1099-OID covers original issue discount, which is interest that accrues without a cash payment.
Step 2: Calculate total taxable interest
Add taxable interest from every payer, including amounts with no form. Reconcile the total to your bank and brokerage records.
A payer's $10 minimum for sending a 1099-INT is not your exemption. Payers have thresholds, but you don't. The IRS compares third-party data against returns through its Automated Underreporter program, as Topic 652 explains, and mismatches can trigger a CP2000 notice.
Step 3: Enter taxable interest on line 2b
Put the total on line 2b of Form 1040 (2025). You generally don't attach your 1099s, but keep them with your records.
Step 4: Enter tax-exempt interest on line 2a
Take the amount from box 8 or your records and enter it on line 2a. Do not add it to line 2b. If you amortise premium on a tax-exempt bond, line 2a shows the net amount.
Step 5: Handle withholding and penalties
- Federal tax withheld (box 4, usually backup withholding) goes on line 25b as a payment.
- Early-withdrawal penalty (box 2) goes on Schedule 1 line 18 and flows into the adjustments on line 10.
When Do You Need Schedule B?
The threshold
For 2025, you need Schedule B if taxable interest or ordinary dividends exceed $1,500. Tax-exempt interest alone doesn't count toward it. The Schedule B instructions list the other triggers.
Triggers regardless of amount
- A foreign financial account or foreign trust
- Nominee interest or dividends
- Accrued interest on bonds you bought
- Seller-financed mortgage interest where the buyer uses the property as a home
- OID reported at less than the Form 1099-OID figure
- Interest reduced by amortisable bond premium
- A Form 8815 exclusion for Series EE or I bonds
Part I: interest
List each payer and amount on line 1, then total on line 2. Enter any Form 8815 exclusion on line 3, subtract on line 4 and carry the result to line 2b. Don't list tax-exempt interest here. Payer names and amounts should match your source documents.
Part III: foreign accounts and trusts
Question 7a asks whether you had a financial interest in, or signature authority over, a foreign account at any time in 2025. Answer "Yes" even if no FBAR is required. Question 7b asks about FinCEN Form 114 and country names. Question 8 covers foreign trusts.
These disclosures differ from other foreign reporting:
| Report | Key threshold (2025) | Where filed |
|---|---|---|
| FBAR (FinCEN 114) | Aggregate over $10,000 at any time | Separately with FinCEN |
| Form 8938, US resident, single | Over $50,000 at year-end or $75,000 at any time | With your return |
| Form 8938, US resident, joint | Over $100,000 at year-end or $150,000 at any time | With your return |
Higher limits apply to taxpayers living abroad. Neither form replaces reporting the interest itself.
Nominee and corrected reporting
If a 1099 shows interest that belongs partly to someone else, include the full amount on line 1. Then subtract the other person's share as a "Nominee Distribution". Don't subtract it twice if the payer already reported net figures.
Special Types of Interest
Savings bond interest and the education exclusion
Cash-method taxpayers generally report Series EE and I bond interest when the bonds are redeemed or mature. You can elect annual reporting instead, and that choice applies to all your EE and I bonds.
Form 8815 can exclude some or all of the interest if you cash eligible post-1989 bonds and pay qualified higher-education expenses in the same year. Key limits:
- Married filing separately is ineligible.
- The 2025 income phase-out starts at $99,500 (single) and $149,250 (joint), with no exclusion at $114,500 and $179,250.
- Tuition and required fees qualify, but room and board do not.
CDs, Treasuries and OID
Reporting rules differ by instrument:
- CDs longer than one year: include part of the interest each year, even before you withdraw
- Treasury bills: report the discount at maturity; notes and bonds: report interest in the year paid
- OID: accrues as income even when you receive no cash, so Form 1099-OID may not match bank deposits
Accrued interest and bond premium
If you buy a bond between interest dates, you pay the seller accrued interest. Subtract it on Schedule B as "Accrued Interest" when it's included on your 1099-INT. Document it separately rather than netting it casually.
Premium on a taxable bond can be amortised by election to reduce taxable interest. Premium on a tax-exempt bond must be amortised and is not deductible.
Foreign accounts and payers
Report foreign interest in US dollars. The IRS uses the spot rate on the date received or accrued. It posts yearly averages and accepts a consistently applied posted rate, so keep your exchange-rate support.
Most foreign-source interest is passive-category income for the foreign tax credit on Form 1116. A tax treaty may reduce withholding too. For NRIs, OCIs and others balancing US and Indian reporting, VJM Global provides US tax compliance and DTAA advisory support.
Is tax-exempt bond interest always fully exempt?
Not always. Qualifying municipal bond interest is exempt from regular federal tax, but:
- Bond premium is amortised against the interest and is not deductible. It is not itself "tax-exempt income".
- Market discount on a tax-exempt bond is not tax-exempt.
- Private-activity bond interest (box 9) goes on Form 6251 line 2g for AMT.
- State tax treatment varies and sits outside this federal overview.
Common Filing Mistakes and When to Seek Help
Watch for these errors:
- Skipping small amounts or assuming no 1099-INT means no reporting
- Treating the payer's $10 threshold as your own
- Leaving out OID that accrued without cash
- Duplicating income already on a consolidated statement
- Putting tax-exempt interest on line 2b, or omitting it from line 2a
- Ignoring corrected 1099s
- Confusing foreign-asset disclosures with income reporting
Take extra care with nominee arrangements, accrued interest, bond premium, OID, savings bond exclusions and foreign accounts.
Consider a qualified tax professional if your return includes foreign financial assets, several foreign payers, complex bonds, unusual ownership structures or business-related interest. This article is educational and not individualised tax advice.
Frequently Asked Questions
What line do I report interest income on Form 1040?
On the 2025 Form 1040, taxable interest goes on line 2b and tax-exempt interest on line 2a. Confirm the line numbers on the form for your tax year.
When do I need to file Schedule B?
You need it when taxable interest or ordinary dividends exceed $1,500. It is also required for foreign accounts or trusts, nominee income, accrued interest, seller-financed mortgages and certain bond adjustments.
How do I calculate taxable interest income?
Add up taxable interest from every payer and record, including income without a 1099. Exclude tax-exempt interest and reconcile the total to your source documents.
Do I need to report interest income on my taxes?
Yes, generally, even if the amount is small or no 1099-INT arrived. Reporting is separate from whether the income is ultimately taxable.
Which interest income is not taxable?
Qualifying municipal bond interest is exempt from regular federal tax, and some savings bond interest may be excluded for education. Exempt interest usually still needs reporting, and special rules can apply.
Is the bond premium on a tax-exempt bond tax-exempt?
No. The bond's interest is exempt, but premium must be amortised and isn't deductible. Check IRS Publication 550 or ask a tax professional about your specific bond.
