TIPS vs. I Bonds: Inflation-Protected Securities Explained

Two US government securities promise to keep up with inflation: Treasury Inflation-Protected Securities (TIPS) and Series I Savings Bonds (I Bonds). They sound similar and are sometimes used interchangeably in commentary, but they work differently and serve different purposes.

How TIPS work

TIPS are tradable Treasury bonds whose principal adjusts twice a year based on changes in CPI-U. Coupon payments (interest) are a fixed percentage of the adjusted principal. So if inflation runs 4%, principal grows 4%, and the 1.5% coupon yields 1.5% on a larger base — your "real" coupon stays at 1.5% but the dollar value rises.

At maturity, you receive the higher of the inflation-adjusted principal or the original face value. There's deflation protection on the original principal but not on prior inflation accumulation.

How I Bonds work

I Bonds are non-tradable savings bonds purchased exclusively through TreasuryDirect.gov. Their composite rate has two parts:

• Fixed rate: Set when you buy, locked for the bond's life (up to 30 years).
• Inflation rate: Reset every 6 months based on CPI-U.

You earn the composite rate (fixed + inflation, with floors). Interest compounds and is paid only when you redeem the bond — meaning no taxable income while held.

The four key differences

1. Purchase limits

TIPS: No limit. Bought at Treasury auctions or on the secondary market via any brokerage.
I Bonds: $10,000/person/year via TreasuryDirect, plus up to $5,000 via tax refund. A couple with two minor children could buy $50,000+ across the family.

2. Liquidity

TIPS: Trade like any bond on the secondary market. Sell anytime at market price (with mark-to-market risk).
I Bonds: Locked for 1 year (no early redemption allowed). Redemptions within 5 years forfeit 3 months of interest. After 5 years, fully liquid with no penalty.

3. Tax treatment

Both are federally taxable but state-tax-exempt. The difference is timing:

• TIPS: "Phantom income" — you owe federal tax annually on the inflation adjustment, even though you haven't received cash. This makes TIPS most efficient in tax-advantaged accounts.
• I Bonds: All federal tax is deferred until redemption (or 30-year maturity, whichever comes first). Phenomenal for late-career savers who plan to redeem in lower-tax retirement years.

4. Yield mechanics

TIPS yield is real (after-inflation). If the 10-year TIPS real yield is 2%, you earn 2% above CPI for 10 years.
I Bonds yield is composite: a small fixed rate + inflation adjustment. The fixed rate in 2024–2026 has been 1.2–1.3%.

When TIPS make sense

• Building a TIPS ladder for retirement income. Each rung delivers known real principal at a known year. TIPSLadder.com makes the math easy.
• Inside a Traditional IRA or 401(k). The phantom-income problem disappears.
• For larger inflation hedges. The $10k I Bond limit is too small for serious portfolio insurance.
• Via ETFs: SCHP, VTIP, TIP offer one-ticker diversified TIPS exposure with daily liquidity (but mark-to-market price volatility).

When I Bonds make sense

• Emergency fund top-up after the first $10k of cash. After the 1-year lockup, I Bonds become liquid savings paying CPI + small fixed rate — usually beating high-yield savings.
• Tax-deferred earned income for kids' college. Bonds redeemed for qualified education may be fully tax-free (Education Bond Program, with income limits).
• Late-career tax management. Defer interest income to retirement years in a lower bracket.
• Inflation protection with deflation floor. The composite rate has a floor of 0% — you can't lose principal to deflation.

The 2022–2023 I Bond surge

In 2022, I Bond composite rates briefly hit 9.62% — the highest in their history — as CPI ran hot. Hundreds of thousands of new accounts opened on TreasuryDirect. Most who bought then locked in the inflation portion but had to hold to access the yield. By 2024, rates had normalized to around 5%. Lesson: I Bonds shine in high-inflation periods. They're a defensive position, not a wealth-builder.

Worked example — pairing TIPS and I Bonds

A 50-year-old building inflation protection allocates:

• $10,000/year (couple's max $20,000) into I Bonds via TreasuryDirect — building a tax-deferred buffer for retirement years.
• 10% of fixed-income allocation in SCHP (TIPS ETF) inside a Traditional IRA — bigger, liquid, daily-priced exposure.

Over 15 years, the I Bond stack grows to $200k+ of tax-deferred inflation-protected savings. The SCHP position grows with the broader TIPS market, fully shielded from phantom-income taxes inside the IRA.

Common mistakes

• Holding TIPS in a taxable account. Phantom income creates tax bills without matching cash. Use IRAs.
• Selling I Bonds in year 4 (forfeiting 3 months of interest) when waiting one more year removes the penalty.
• Confusing fixed and inflation portions of I Bonds. The fixed rate is locked for life of the bond; only the inflation rate resets. Buy when fixed rates are higher (currently 1.2–1.3%).
• Ignoring TIPS during deflationary fear. TIPS deliver principal repayment at par or adjusted, whichever is higher. Their downside risk in deflation is limited.

FAQs

Can I lose money on TIPS?

Yes, if you sell before maturity at a price below what you paid. Held to maturity, TIPS deliver par or inflation-adjusted, whichever is higher.

How does the I Bond fixed rate get set?

Treasury announces twice a year (May and November). Recent rates: 0% (2008–2010), 0.5% (2019), 0% (2021), 0.4% (2022), 0.9% (2023), 1.3% (2024).

Are these in a 401(k)?

You can hold TIPS funds (like SCHP) in a 401(k). I Bonds cannot be held in any tax-advantaged account — they're sold only via TreasuryDirect in your name.

Sources and further reading

This guide draws on primary research, government data, and industry-standard frameworks. Selected sources used in the analysis above:

• S&P Dow Jones SPIVA scorecards — semi-annual reports tracking active fund performance vs. benchmarks across categories. Available at spglobal.com/spdji.
• Federal Reserve Economic Data (FRED) — Treasury yields, inflation series, household balance sheets, and other government time series. fred.stlouisfed.org.
• Morningstar research — "Mind the Gap" investor return studies, withdrawal-rate research by David Blanchett, and category-level fund analytics.
• Vanguard research papers — Donaldson et al. on currency hedging, Bennyhoff & Kinniry on advisor alpha, plus the foundational Bogle case for indexing.
• Academic journals — Journal of Financial Planning, Financial Analysts Journal, Journal of Portfolio Management. The Bengen (1994) and Trinity Study (1998) papers are foundational reading.
• IRS publications — Pub 590-A and 590-B (IRAs), Pub 502 (medical expenses), Pub 17 (general). Authoritative on tax mechanics.

Where this guide cites specific numbers, those numbers were drawn from current published sources at time of writing. Tax law and contribution limits change every year — verify any specific figures against the current IRS or Treasury source before acting.

Related guides on Krovea

If this topic resonated, you'll likely find depth in adjacent areas of the site. Our build-a-portfolio guide covers the three-fund foundation that anchors most of these strategies. The rebalancing guide shows how to maintain the allocation over decades. The asset-location and tax-loss-harvesting guides cover the high-leverage tax moves that most investors leave on the table. And our dictionary has plain-language definitions for every term used here — no jargon, no marketing.

The bottom line

This guide is meant to give you a working framework — not a final answer. Your situation, tax bracket, goals, and risk tolerance will shape exactly how you apply these ideas. The patterns and research cited here are durable, but execution requires judgment.

Putting this into practice

Pick one idea from this guide and act on it within the next 48 hours. Open the account, automate the transfer, run the calculation. The cost of perfect information you never act on is the same as the cost of no information. Most of the wealth-building outcomes in this entire site come from people who decided to start before they had it all figured out.

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