Interest income is one of the most common forms of passive income, but it’s also one of the most misunderstood when it comes to taxation. Whether you’re earning interest from a high-yield savings account, certificates of deposit (CDs), Treasury bonds, or corporate debt, the IRS treats this income as taxable. In 2025, understanding how interest income is taxed—and how to report it correctly—can help you avoid penalties and optimize your financial strategy.
What Counts as Interest Income?
Interest income includes earnings from:
- Savings accounts (including high-yield accounts)
- Money market accounts
- Certificates of deposit (CDs)
- Treasury securities (e.g., T-bills, T-notes, T-bonds)
- Corporate and municipal bonds
- Interest-bearing checking accounts
- Peer-to-peer lending platforms
- Original Issue Discount (OID) instruments
If you receive more than $10 in interest from any financial institution, you’ll typically receive Form 1099-INT or Form 1099-OID, which must be reported on your federal tax return.
Tax Treatment of Interest Income on 2025 Taxes
On your 2025 taxes, interest income is taxed as ordinary income, meaning it’s added to your total taxable income and taxed according to your marginal tax bracket. The IRS does not offer preferential rates for interest income like it does for qualified dividends or long-term capital gains.
2025 Federal Income Tax Brackets
Here’s a simplified breakdown of the treatment of interest income on 2025 federal taxes, by tax brackets, for single filers:
Source: IRS 2025 Tax Brackets
So, if you earn $1,000 in interest and fall into the 22% tax bracket, you’ll owe $220 in federal taxes on that interest income in 2025.
Tax-Exempt Interest
Not all interest income is taxable. Municipal bond interest is generally exempt from federal income tax and may also be exempt from state and local taxes if you reside in the issuing state. However, tax-exempt interest must still be reported on your tax return, typically on Line 2a of Form 1040.
Reporting Interest Income on 2025 Taxes
Interest income is reported on:
- Form 1040: Line 2b for taxable interest; Line 2a for tax-exempt interest
- Schedule B: Required if your interest income in 2025 exceeds $1,500 or comes from multiple sources
You’ll also need to include any OID income, which accrues over time and is reported on Form 1099-OID.
Special Cases: Compound Interest and OID
If you invest in zero-coupon bonds or other instruments sold at a discount, you may earn Original Issue Discount (OID) income. This is taxable annually—even if you don’t receive the cash until maturity. The IRS requires you to report this income each year as it accrues.
State and Local Tax Considerations
Interest income is typically subject to state and local income taxes, unless it’s from tax-exempt municipal bonds. Idaho, for example, taxes interest income as part of your total taxable income, with rates ranging from 1% to 6% depending on your income level.
Strategies to Minimize Tax on Interest Income
While you can’t avoid taxes on interest income entirely, you can reduce your tax liability through smart planning:
- Use tax-advantaged accounts: Interest earned in IRAs, Roth IRAs, and 401(k)s is tax-deferred or tax-free.
- Invest in municipal bonds: These offer tax-free interest at the federal level and potentially at the state level.
- Consider U.S. Treasury securities: Interest is exempt from state and local taxes.
- Spread income across years: Laddering CDs or bonds can help manage your taxable income year-to-year.
Common Pitfalls to Avoid
- Ignoring small amounts: Even $10 in interest must be reported.
- Misreporting OID income: This can trigger IRS scrutiny.
- Assuming tax-exempt means non-reportable: You must still disclose tax-exempt interest.
Final Thoughts
Interest income may seem straightforward, but its tax implications can be complex. For 2025 Federal Taxes, the IRS continues to treat interest income as ordinary income, subject to your marginal tax rate. By understanding how it’s taxed, where to report it, and how to minimize your liability, you can make smarter financial decisions and stay compliant