I Bond composite rate: 4.26%. TIPS 10-year real yield: 2.31% — highest since before the pandemic. Both are U.S. Treasury-backed and indexed to CPI. Here's exactly when to use each, and when to use both.
Series I Savings Bonds (I Bonds) and Treasury Inflation-Protected Securities (TIPS) are both issued by the U.S. Treasury and both adjust for inflation using the same index: the Consumer Price Index for Urban Consumers (CPI-U). But the mechanics, tax treatment, liquidity, and ideal use cases are fundamentally different.
Non-marketable savings bonds sold only at TreasuryDirect.gov. The inflation adjustment changes the interest rate every six months, not the principal. No secondary market — you buy and hold, then redeem directly with Treasury. Capped at $10,000 per person per year. Tax-deferred until redemption.
Marketable Treasury bonds sold at auction in 5-, 10-, and 30-year maturities. The inflation adjustment increases (or decreases) the principal daily. Trade on the secondary market like any bond. No purchase limit. Taxed annually on phantom income from the principal adjustment. Available as ETFs (VTIP, SCHP, TIP).
The most important sentence to understand: I Bonds are personal savings instruments with hard limits and built-in tax advantages. TIPS are institutional-grade bonds with no limits and more complex tax treatment. Neither is universally better — the right choice depends entirely on your tax bracket, account type, time horizon, and how much you want to invest.
| Period | Fixed Rate | Inflation Adj. | Composite | Note |
|---|---|---|---|---|
| Nov 2021–Apr 2022 | 0.00% | 7.12% | 7.12% | Peak era begins |
| May 2022–Oct 2022 | 0.00% | 9.62% | 9.62% | All-time high composite |
| Nov 2022–Apr 2023 | 0.40% | 6.49% | 6.89% | Fixed rate returns |
| May 2023–Oct 2023 | 0.90% | 3.40% | 4.30% | Rate normalizes |
| Nov 2023–Apr 2024 | 1.30% | 3.94% | 5.27% | Highest fixed rate in 16yr |
| May 2024–Oct 2024 | 1.30% | 2.96% | 4.28% | |
| Nov 2024–Apr 2025 | 1.20% | 1.90% | 3.11% | Inflation cooling |
| May 2025–Oct 2025 | 1.10% | 1.76% | 2.86% | |
| Nov 2025–Apr 2026 | 0.90% | 2.21% | 3.11% | |
| May 2026–Oct 2026 | 0.90% | 3.34% | 4.26% | Current rate ↑ |
Why this moment is notable. TIPS real yields at 2.01–2.87% are at their highest since the pre-pandemic era. From 2011 to 2021, 10-year real yields were often negative — investors were paying the U.S. government for inflation protection. Today's environment offers genuine real return above inflation, which changes the calculus significantly in favor of TIPS for long-term inflation-protected portfolios.
| Feature | I Bonds | TIPS |
|---|---|---|
| Issued by | U.S. Treasury (TreasuryDirect.gov) | U.S. Treasury (auction + secondary mkt) |
| Backed by | Full faith and credit of the U.S. | Full faith and credit of the U.S. |
| Current yield (July 2026) | 4.26% composite rate | 2.01% (5yr) · 2.31% (10yr) · 2.87% (30yr) real |
| What moves the yield | Fixed rate + CPI-U semiannual inflation adj. | Principal adjusts daily with CPI-U |
| Annual purchase limit | $10,000/person/year ($5K extra via tax refund) | None (individual purchases unlimited) |
| Minimum investment | $25 (electronic); $50 (paper) | $100 (at auction) |
| Liquidity | Locked 12 months; 3-mo penalty before 5 yrs | Trade daily on secondary market |
| Price volatility | None — no secondary market | Yes — price moves with real rates |
| Tax treatment | Federal tax deferred until redemption; state-exempt | Federal tax on phantom income annually; state-exempt |
| Education tax exclusion | Yes (income limits apply) | No |
| Best account type | Taxable (tax deferral built in) | IRA or Roth IRA (avoid phantom income) |
| Deflation protection | Rate can't go below 0% — full protection | Principal can't fall below par at maturity |
| Where to buy | TreasuryDirect.gov only | TreasuryDirect, broker (Fidelity, Schwab), or ETF |
Both I Bonds and TIPS are exempt from state and local income tax. But their federal tax treatment is where they diverge sharply — and this difference alone can determine which is right for your situation.
The practical rule: Hold I Bonds in a taxable account (tax deferral is the advantage). Hold TIPS in an IRA or Roth IRA (eliminates phantom income). If you have no tax-advantaged space left, I Bonds win by default for taxable accounts even if their real yield is lower.
Tax deferral is extremely valuable at high brackets. No price volatility, no phantom income.
Phantom income taxed annually makes TIPS less efficient in taxable accounts.
$10,000/year limit ($20K for couples) means large allocations aren't possible.
No purchase limit. Buy $50K, $200K, or any amount at TreasuryDirect auctions or through a broker.
I Bonds cannot be held inside an IRA — they're only available via TreasuryDirect in your own name.
TIPS and TIPS ETFs can be held in any IRA. Inside a Roth IRA, the phantom income problem disappears entirely.
I Bonds cannot be redeemed during the first 12 months under any circumstances.
Short-term TIPS or VTIP ETF can be sold any business day at market price.
Interest is federally tax-exempt when used for qualified higher education expenses (income limits apply for 2026).
TIPS have no education tax exclusion.
0.90% fixed rate. The inflation variable helps, but TIPS real yields are significantly higher.
5-year TIPS at 2.01% real yield, 10-year at 2.31% — well above I Bond's 0.90% fixed component.
For most investors, TIPS ETFs are the most practical way to gain TIPS exposure — especially inside an IRA. Rather than managing individual bond maturities through TreasuryDirect, you can buy a single ETF that holds a diversified ladder of TIPS.
| ETF | Name | Exp. Ratio | Avg Duration | AUM | Best For |
|---|---|---|---|---|---|
| VTIP | Vanguard Short-Term TIPS ETF | 0.04% | ~2.5 yrs | $20B+ | Lowest cost; minimal rate risk |
| SCHP | Schwab U.S. TIPS ETF | 0.03% | ~7.5 yrs | $15B+ | Cheapest broad TIPS ETF |
| TIP | iShares TIPS Bond ETF | 0.19% | ~7.5 yrs | $35B+ | Largest; most liquid |
| LTPZ | PIMCO 15+ Year TIPS ETF | 0.20% | ~20 yrs | $1B+ | Long-duration; high inflation sensitivity |
VTIP is the top pick for most IRA investors — the 0.04% expense ratio is nearly free, the short duration (~2.5 years) means minimal interest rate risk, and it provides full CPI-linked inflation protection. For investors comfortable with longer duration and willing to take on more rate sensitivity for a higher real yield, SCHP or TIP are solid options. Hold LTPZ only if you have a specific long-duration inflation view.
Create an account at TreasuryDirect.gov (free)
Link your bank account (ACH transfer)
Purchase I Bonds electronically in any amount from $25
Optional: Receive up to $5,000 more in paper I Bonds by directing your federal tax refund via IRS Form 8888
Wait at least 12 months before any redemption; redeem through TreasuryDirect
Option A: Buy at auction via TreasuryDirect.gov in $100 increments — Treasury holds 5-, 10-, and 30-year TIPS auctions throughout the year
Option B: Buy existing TIPS on the secondary market through any brokerage (Fidelity, Schwab, Vanguard, Interactive Brokers)
Option C: Buy a TIPS ETF (VTIP, SCHP, TIP) through any brokerage account or IRA — simplest option for most investors
Hold TIPS inside an IRA or Roth IRA to avoid annual taxation on phantom income from principal adjustments
I Bonds are ideal for taxable accounts, especially for investors in high tax brackets who benefit from the built-in federal tax deferral. The $10,000/year limit makes them a supplemental instrument, not a core position. The 4.26% composite rate is competitive right now, and the 0.90% fixed component locked in today stays with the bond for up to 30 years — a meaningful long-term real return floor.
TIPS are better for large allocations and retirement accounts. With 10-year real yields at 2.31% — the highest since before the pandemic — TIPS currently offer the best long-term real return in the investment-grade fixed income universe. No purchase limit means you can allocate $50K, $200K, or more. Hold via VTIP or SCHP inside an IRA to eliminate the phantom income problem.
The optimal strategy for most investors: max out I Bonds in your taxable account each year ($10K per person) and hold TIPS ETFs (VTIP or SCHP) in your IRA for larger inflation protection exposure. The two instruments complement each other rather than compete.
Related reading: SGOV vs BIL vs SHV (ultra-short Treasury ETFs), Emergency Fund & HYSA Guide 2026, Best ETFs for Your Roth IRA.
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