Neither is universally better. I Bonds usually suit an individual building a smaller, long-term inflation-protected savings reserve who values federal-tax deferral and stable redemption value. TIPS usually suit investors who need scalable purchases, tradability, scheduled cash interest, or a maturity ladder. The deciding factors are how much you can invest, when you may need the money, where you hold it for tax purposes, and whether you need current income—not simply whether the investment tracks inflation.
For I Bonds issued from May 1 through October 31, 2026, the U.S. Treasury lists a 4.26% composite annual rate, including a 0.90% fixed rate. That rate is specific to that issue period; the inflation component and composite rate reset every six months.
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What each investment actually is
Both products are issued by the U.S. Treasury and are designed to respond to changes in the Consumer Price Index for All Urban Consumers (CPI-U), but they work differently.
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Series I Savings Bonds earn a composite rate made from a fixed rate and a semiannual inflation rate based on CPI-U. Interest accrues inside the bond rather than being paid to you on a schedule. You redeem an I Bond through TreasuryDirect after meeting the holding-period rules; you cannot sell it to another investor in a secondary market.
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The composite rate can fall when inflation falls, but Treasury’s comparison describes I Bond earnings as a rate that cannot drop below zero. That protects the accumulated value from a negative nominal rate, although it does not guarantee a positive real return after inflation and taxes.
TIPS are marketable Treasury securities
Treasury Inflation-Protected Securities (TIPS) have a stated maturity and a fixed coupon. Treasury adjusts the principal for CPI-U, and the coupon is calculated on that adjusted principal. Because the principal changes, the dollar amount of each interest payment can rise or fall with inflation.
TIPS can be purchased at Treasury auctions or through banks, brokers, and dealers, then sold before maturity. Their market price changes as real interest rates, inflation expectations, and overall bond-market conditions change.
Side-by-side comparison
| Feature | I Bonds | TIPS |
|---|---|---|
| Inflation adjustment | Composite rate combines a fixed rate with a semiannual CPI-U-based inflation rate. | Principal is adjusted with CPI-U; a fixed coupon is paid on the adjusted principal. |
| Marketability | Nonmarketable; redeem through TreasuryDirect after the one-year minimum holding period. | Marketable; buy at auction or through a bank, broker, or dealer and sell before maturity. |
| Cash flow | Interest accrues and is received when you redeem the bond. | Interest is paid every six months. |
| Purchase capacity | $10,000 per Social Security number per calendar year for electronic I Bonds. | $100 minimum; TreasuryDirect lists up to $10 million for a noncompetitive auction purchase. |
| Federal tax timing | Federal tax may be deferred until redemption, final maturity, or another taxable disposition. | Federal tax generally applies each year to interest and inflation adjustments as they occur. |
| State and local income tax | Exempt. | Exempt. |
| Early exit | No redemption during the first 12 months; redeeming before five years costs the last three months of interest. | Sale is possible before maturity, but the market price may be above or below your purchase price. |
| Deflation protection | The composite rate cannot be below zero. | At maturity, Treasury pays the greater of adjusted principal or original principal. |
How I Bond inflation protection works
The six-month rate cycle
An I Bond’s inflation component is recalculated every six months from CPI-U data. The fixed-rate portion is set when the bond is issued and remains with that bond. The composite calculation combines the two components, so a bond’s rate reflects both the fixed rate locked at issuance and the current inflation component.
The 4.26% composite rate listed for May 1–October 31, 2026, includes a 0.90% fixed rate. It is an annualized rate used for the applicable six-month earning period, not a promise that every future six-month period will pay 4.26%. Treasury can announce a different fixed rate and inflation component for later issue windows.
Why the value does not swing with bond markets
I Bonds do not have a quoted secondary-market price. If you hold one through the applicable rules, its redemption value is determined by Treasury’s accrual formula rather than by the price another investor is willing to pay that day. That removes the day-to-day price volatility found in marketable bonds.
The liquidity trade-off
You cannot redeem an I Bond during the first 12 months after purchase. If you redeem after one year but before the fifth anniversary, Treasury withholds the most recent three months of interest. After five years, that penalty no longer applies. The annual electronic purchase limit of $10,000 per Social Security number also makes I Bonds difficult to use for a very large inflation hedge in a single year.
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Principal adjustment and coupon payments
When CPI-U rises, a TIPS’s principal is adjusted upward. The fixed coupon rate is applied to that larger principal, so future semiannual interest payments can increase. If the index declines, the adjusted principal and coupon payment can decline as well.
At maturity, Treasury pays whichever is greater: the inflation-adjusted principal or the original principal. That maturity floor protects the original principal from a cumulative deflation loss when you hold the individual security to maturity. It does not prevent a loss if you sell earlier at a lower market price.
Maturities and purchase size
TIPS are issued in 5-, 10-, and 30-year maturities. TreasuryDirect lists a $100 minimum purchase and up to $10 million for a noncompetitive auction purchase. The larger capacity allows an investor to build a substantial inflation-linked allocation or stagger maturities to match future spending dates.
Why the market price can fall
A TIPS’s coupon is fixed, but its market price is not. If real interest rates rise after you buy, newer bonds can offer more attractive yields and your TIPS may trade at a discount. Longer-maturity TIPS generally react more strongly to changes in real rates because more cash flows arrive far in the future. Selling before maturity therefore introduces interest-rate risk that an I Bond does not have.
Which one has less risk?
If “risk” means losing nominal value before you need the money
I Bonds have the simpler risk profile after the 12-month lockup: there is no secondary-market quote to fluctuate, and the composite rate cannot be negative. You still face inflation risk if the rate lags your personal cost increases, plus the opportunity cost of money that cannot be accessed during the first year.
An individual TIPS can be worth less than its purchase price on the day you sell. That is a real possibility even when CPI-U has risen, because real interest-rate movements can outweigh the inflation adjustment in the market price.
If “risk” means failing to preserve purchasing power at a date
Both instruments are linked to a government inflation index, not to your household’s exact spending basket. A retiree whose medical, housing, or energy costs rise faster than CPI-U can experience a different inflation rate than either security reflects.
Holding an individual TIPS to maturity removes the need to sell at an unfavorable market price and provides the maturity principal floor. Holding an I Bond through the required period avoids market-price risk but leaves you with no guaranteed maturity date or scheduled cash distribution.
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Tax treatment can determine the winner
I Bond tax timing
For federal income-tax purposes, I Bond interest may generally be deferred until you redeem the bond, it reaches final maturity, or you complete another taxable disposition. The interest is exempt from state and local income tax. Deferral can be useful when you are accumulating money now and expect to choose the redemption year later.
Qualified higher-education use may permit a federal tax exclusion, but eligibility depends on IRS rules, the educational institution, filing status, modified adjusted gross income, and other requirements. Do not assume that any tuition payment automatically qualifies.
TIPS annual taxation and “phantom income”
Interest and inflation adjustments on TIPS generally create federal taxable income as they occur. The inflation adjustment can be taxable even though you do not receive that adjustment as cash until you sell or the security matures. This mismatch is often called phantom income: your tax bill can rise before your cash proceeds do.
Both securities are exempt from state and local income tax, but the account holding them matters. A taxable brokerage account, a traditional retirement account, and a Roth account can produce different tax timing and reporting. Treasury’s product pages describe the securities themselves, not the tax treatment of every account type, so confirm the rules that apply to your account and tax situation.
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Which is better for retirement income?
Choose TIPS for scheduled cash flow
TIPS pay interest every six months, making them more practical when you need a predictable stream of portfolio cash. A ladder of 5-, 10-, and 30-year issues can be arranged so principal comes due in different retirement years. You can spend the coupon, reinvest it, or combine it with maturities to meet planned expenses.
The trade-off is that selling before maturity can produce a gain or loss, and annual federal taxation can apply to inflation adjustments even when the cash payment for that adjustment has not arrived.
Choose I Bonds for a flexible reserve you can defer
I Bonds do not provide periodic income. They accumulate interest, and you receive the value when you redeem them. That can work for a reserve intended to be tapped occasionally, for example during an early-retirement year when you want to choose which tax year recognizes the interest.
The $10,000 annual electronic limit per Social Security number means I Bonds are usually a supplement to, not a complete replacement for, a larger retirement-income portfolio. The one-year lockup also makes them unsuitable for money that may be needed immediately.
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I Bonds are usually the better fit when you:
- Are investing a small or moderate amount within the $10,000 annual electronic limit.
- Can leave the money untouched for at least 12 months and preferably five years.
- Want federal-tax deferral rather than current taxable income.
- Prefer a redemption value that is not marked to a daily bond-market price.
- Are saving for a possible qualified-education expense and will verify IRS eligibility.
TIPS are usually the better fit when you:
- Need to invest more than the I Bond annual limit.
- Want interest payments every six months.
- Need a marketable security that can be sold before maturity.
- Are building a maturity ladder for known future spending dates.
- Can tolerate price changes or intend to hold each issue to maturity.
Use both when their jobs are different
There is no rule that an inflation hedge must be all one product. An investor might use I Bonds for a tax-deferred emergency or early-retirement reserve and TIPS for larger, dated expenses or ongoing income. Keep the roles separate: the I Bond allocation is constrained by access and annual capacity, while the TIPS allocation must account for maturity, duration, market price, and annual taxation.
A practical buying checklist
- Set the time horizon. If the money could be needed in the next 12 months, I Bonds cannot serve that need. If it may be needed before a TIPS maturity, decide whether you can accept a market sale.
- Set the cash-flow requirement. Select TIPS if semiannual income is important; select I Bonds if accumulating value without current payments is preferable.
- Check the amount. Apply the $10,000 per-Social-Security-number annual electronic limit to I Bonds. Use TIPS when the required allocation is larger or when you need to deploy a specific amount at once.
- Choose the tax location. Compare federal tax deferral for I Bonds with annual TIPS taxation, including tax on inflation adjustments that are not paid as cash. Review the rules for your brokerage or retirement account separately.
- Match maturities to spending. For TIPS, select 5-, 10-, or 30-year maturities and stagger them when a maturity ladder is useful. For I Bonds, plan around the one-year lockup and five-year penalty period rather than a fixed maturity date.
- Recheck current terms before purchasing. Treasury rates, auction yields, purchase limits, tax rules, and TreasuryDirect procedures can change. The 4.26% I Bond composite rate applies only to the May 1–October 31, 2026 issue window.
Common mistakes and how to avoid them
- Calling I Bonds “marketable.” They cannot be sold to another investor; redemption is through TreasuryDirect after the required holding period.
- Assuming inflation guarantees a TIPS profit. CPI-U adjustments do not prevent a loss when market prices fall and you sell before maturity.
- Ignoring the tax bill on TIPS adjustments. Keep records and cash planning for federal tax on inflation income that may not yet have been paid out.
- Treating the current I Bond rate as permanent. The inflation component and composite rate reset every six months, while the 0.90% fixed rate cited for the May–October 2026 issue period applies to bonds issued in that window.
- Using either product as a perfect personal inflation index. Both use CPI-U, which may not match your household’s actual spending pattern.
- Putting short-term cash into a locked product. Maintain a separate immediately accessible reserve before committing money to I Bonds or longer-maturity TIPS.
Bottom line
I Bonds are generally the stronger choice for an individual seeking a tax-deferred, low-volatility inflation-linked savings bucket and who can accept the first-year lockup and annual purchase limit. TIPS are generally stronger for larger allocations, tradability, semiannual income, or a dated retirement-income ladder, provided you understand market-price risk and annual federal taxation of inflation adjustments. Compare the two by amount, liquidity, tax location, cash-flow needs, and holding period; inflation linkage alone does not decide the question.
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