When inflation eats into cash, two U.S. government securities are built specifically to fight back: Series I Savings Bonds and Treasury Inflation-Protected Securities, or TIPS. Both adjust with the cost of living, but they work so differently in how you buy them, access your money, and get taxed that picking the wrong one can undercut your goal. Here is how they compare for 2026.
How Each One Protects You
I Bonds and TIPS both track inflation, but through different mechanics.
- I Bonds: earn a fixed rate plus a variable inflation rate that resets twice a year; the value never falls.
- TIPS: the principal itself adjusts up or down with the Consumer Price Index, and interest is paid on the adjusted principal.
- Deflation behavior: I Bonds cannot lose value; TIPS principal can decline during deflation but is guaranteed to return at least the original amount at maturity.
Buying and Access Rules
I Bonds are purchased directly from TreasuryDirect, with an annual purchase limit per person, and cannot be sold; you redeem them. They must be held at least one year, and cashing out before five years forfeits three months of interest. TIPS trade freely, can be bought through a brokerage or at auction, and can be sold anytime at market price.
The Tax Differences That Matter
Taxes often decide the winner for a given goal.
- I Bonds: federal tax on interest can be deferred until redemption, and they are exempt from state and local tax.
- TIPS: owe federal tax annually on both interest and the inflation adjustment, the so-called phantom income, making them better suited to tax-advantaged accounts.
Which to Choose
I Bonds suit an emergency-fund supplement or medium-term savings you will not touch for a year, thanks to tax deferral and no price risk. TIPS suit larger sums, precise maturity planning, or building an inflation-protected bond ladder inside an IRA where the annual tax is not an issue.
A Little-Known I Bond Tax Perk
Beyond state-tax exemption, I Bonds carry an education benefit many savers miss. If you redeem them to pay qualified higher-education expenses, the interest may be fully or partially federal-tax-free, subject to income limits. That turns an inflation hedge into a flexible college-savings backup that, unlike a 529, can be redirected to retirement or emergencies if the education need never materializes. TIPS offer no equivalent perk, which reinforces holding them inside tax-sheltered accounts.
- I Bond interest can be tax-free when used for qualifying tuition, within income limits.
- The one-year minimum hold makes I Bonds unsuitable for true emergency cash.
- Buy TIPS at auction to avoid paying a premium over adjusted principal.
The Bottom Line
Neither is strictly better; they serve different jobs. Use I Bonds for flexible, smaller, tax-deferred inflation protection and TIPS for scalable, tradable protection best held in a retirement account. Because purchase limits, rates, and tax treatment shift, verify current terms on TreasuryDirect and consider guidance from a financial professional before investing.