Series I savings bonds accrue interest that is subject to federal income tax and generally exempt from state and local income tax. For electronic I bonds held in TreasuryDirect, most owners defer federal tax on the interest until the year they redeem the bond, it reaches final maturity, or they dispose of it—unless they elect to report interest as it accrues each year. Product mechanics (purchase caps, lockups): Series I bonds basics. Account setup: TreasuryDirect account basics. Filing workflow: Filing taxes for beginners.
This page is tax-timing orientation, not a substitute for IRS Publication 550 / savings-bond instructions or a tax pro. Confirm that year’s Form 1099-INT and election rules before you file.
Default deferral vs annual accrual election
| Approach | What you do | When federal tax usually hits | Who might choose it |
|---|---|---|---|
| Defer (default for most individual electronic holders) | Do nothing special; redeem later | Year of redemption, final maturity, or taxable disposition—Treasury/IRS report interest then | Owners who want simplicity and may be in a lower bracket later |
| Report annually | Make a consistent election to include accrued interest each year | Each tax year as interest accrues | Rare for small holdings; sometimes used for kids’ bonds or specific planning—get advice |
| HYSA / bank CD interest | N/A—banks issue 1099-INT yearly | Generally each year credited (High-yield savings accounts) | Liquid cash; no savings-bond deferral |
Series EE bonds follow a similar federal deferral pattern for many individual holders—see Series EE bonds basics—but fixed-rate and maturity guarantees differ from I bonds.
What actually shows up on tax forms
- TreasuryDirect generally issues or makes available Form 1099-INT for the year interest becomes taxable under your method (often the redemption year if you deferred).
- Interest is federal; keep state returns in mind—most states do not tax U.S. savings-bond interest, but confirm your state booklet.
- Redeeming several years of accrued interest in one calendar year can create a bracket spike even though the economic gain accrued slowly—model with Tax bracket vs effective rate.
- Education-related exclusion of savings-bond interest (when tuition rules and income limits are met) is a separate IRS path—paperwork-heavy; do not assume every I bond redemption for “college” is tax-free. Coordinate with 529 qualified expenses so you do not mix wrappers casually.
Named software (TurboTax, H&R Block, Free File options, Cash App Taxes) asks about savings-bond interest when you enter a 1099-INT—match boxes to TreasuryDirect’s download, not a guess.
Worked example
Jordan bought $10,000 of electronic I bonds in 2020 and deferred tax. In 2026 Jordan redeems the full holding. Accrued interest over the years totals $2,400 (illustrative). TreasuryDirect reports $2,400 of interest on the 2026 Form 1099-INT. Jordan’s other taxable income already fills the 22% federal bracket; the $2,400 is taxed federally in 2026 (state: typically $0 on U.S. savings-bond interest—confirm).
If Jordan had instead kept $10,000 in an Ally or Capital One 360 HYSA earning a similar cumulative dollar amount spread across years, Jordan would have received annual 1099-INTs and paid tax along the way—smoother brackets, but no I-bond inflation component or state exemption pattern.
Jordan does not also report the same $2,400 again in later years. After redemption, the cash can sit in a HYSA; future HYSA interest is taxed yearly as usual.
Practical habits
- Decide before a large redemption year whether spreading redemptions across tax years would soften a bracket jump.
- Download TreasuryDirect tax documents each January; store with your return packet.
- If you once elected annual reporting, understand that elections are sticky—read IRS rules before you try to change methods.
- Do not confuse Treasury bill OID/interest timing (often taxed as instruments mature or per brokerage 1099s) with savings-bond deferral; bills live in a different product lane inside TreasuryDirect.
- Gift, trust, and estate holdings can change who reports interest—use a professional when title is not a simple individual account.
Checklist
- Confirm you used the default deferral method unless you knowingly elected annual reporting.
- Before redeeming a large balance, estimate federal tax on accrued interest.
- Watch for education-exclusion eligibility only with current IRS worksheets—not vibes.
- Enter the correct tax-year 1099-INT from TreasuryDirect.
- Keep redemption confirmations with your records for at least several years.
- Re-read Series I bonds basics for lockup and early-redemption interest penalties (separate from tax timing).
Educational only. Not tax, investment, or legal advice. IRS and Treasury reporting rules change; confirm with current IRS publications, TreasuryDirect tax documents, and a qualified tax professional.