Quick Answer
TIPS are Treasury bonds whose principal adjusts with inflation (CPI), paying a fixed coupon on the growing principal. I Bonds are savings bonds earning a composite rate (fixed + inflation), currently ~3.1%. Both guarantee your investment keeps pace with inflation. I Bonds are better for small investors ($10K/year limit); TIPS are better for larger allocations with no limit.
Key Takeaways
- TIPS adjust their principal with CPI inflation — your investment grows as prices rise.
- I Bonds combine a fixed rate + inflation rate, currently yielding ~3.1% (March 2026).
- I Bonds are limited to $10,000/year per person; TIPS have no purchase limit.
- Both are backed by the U.S. government — zero credit risk.
Tahir Özcan
Founder & Lead AuthorPersonal-finance researcher & software engineer · WealthCalc · Est. 2025
Tahir built WealthCalc after a decade of modeling household budgets, retirement plans, and mortgage amortization schedules for family and friends. He translates dense regulatory language — IRS Revenue Procedures, SSA COLA announcements, FHFA conforming loan limits — into accurate, usable calculator logic. Every formula is hand-audited against the primary government release and cross-validated with CFA Institute curriculum standards. Read our editorial standards →
- Every figure cites a primary government source
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When inflation rises, most bonds lose value because their fixed interest payments buy less. TIPS and I Bonds are specifically designed to solve this problem — they are the only U.S. government securities that guarantee your purchasing power is maintained regardless of inflation.
How TIPS Work
TIPS (Treasury Inflation-Protected Securities) adjust their face value with CPI:
- Maturities: 5, 10, and 30 years
- Coupon payment: Fixed rate (currently ~1.8–2.1% for 10-year) applied to inflation-adjusted principal
- Inflation adjustment: Principal increases with CPI; coupon payments grow accordingly
- Deflation floor: At maturity, you receive the greater of adjusted principal or original face value
- Taxation: Inflation adjustment is taxed annually as income (even though you do not receive it until maturity) — best held in tax-advantaged accounts
- Purchase: Via brokerage or TreasuryDirect; no annual limit
How I Bonds Work
Series I Savings Bonds earn a composite rate:
- Composite rate = Fixed rate + Inflation rate (adjusted every 6 months)
- Current rate (March 2026): ~3.1% (fixed: 1.2% + inflation: ~1.9%)
- Purchase limit: $10,000 per person per year electronically (+ $5,000 via tax refund)
- Minimum hold: 1 year; penalty of 3 months interest if redeemed before 5 years
- Tax advantages: Federal tax deferred until redemption; exempt from state/local tax; tax-free if used for qualified education expenses
- Deflation protection: Composite rate cannot go below 0%
TIPS vs I Bonds: Side-by-Side
Key differences for choosing between them:
- Purchase limit: I Bonds $10K/year per person; TIPS unlimited
- Liquidity: TIPS tradeable on secondary market anytime; I Bonds locked for 1 year
- Tax timing: TIPS taxed annually on phantom income; I Bonds tax-deferred until redemption
- Best account: TIPS in IRA/401(k) to avoid phantom income tax; I Bonds in taxable (already tax-deferred)
- Volatility: TIPS prices fluctuate with interest rates; I Bonds have no price volatility
When to Use Each
Match the product to your situation:
- I Bonds: Best for emergency fund supplement, education savings, or anyone wanting up to $10K/year of guaranteed inflation protection with zero volatility
- TIPS: Best for larger allocations, retirement portfolios, and investors with tax-advantaged account space
- TIPS funds/ETFs: For easy diversification across TIPS maturities — e.g., Vanguard TIPS ETF (VTIP) or iShares TIPS Bond ETF (TIP)
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Frequently Asked Questions
Are I Bonds a good investment in 2026?
At ~3.1% with zero risk and state tax exemption, I Bonds are a solid choice for conservative savings. They beat most HYSAs on an after-tax basis for residents of high-tax states. The main limitation is the $10,000/year purchase cap. Max out I Bonds before putting more into other inflation-protected assets.
Can TIPS lose money?
If you hold TIPS to maturity, you are guaranteed at least your original principal (deflation floor). However, if you sell TIPS before maturity or hold TIPS funds, their market value can drop when real interest rates rise. In 2022, TIPS funds lost 10–12% as rates surged — even though the inflation protection was working. Duration risk still applies.
Should I buy TIPS directly or through a fund?
Direct purchase (TreasuryDirect or brokerage) is best if you plan to hold to maturity — you get the exact inflation protection with no fund expenses. TIPS funds (ETFs like VTIP or TIP) are better for flexibility, diversification across maturities, and easy rebalancing. In retirement accounts, TIPS funds are the most practical option.
Primary Sources
Last reviewed:
All 2026 figures in this article are pulled from the official statutory releases linked below. We update them within 48 hours of a new IRS Revenue Procedure, SSA COLA announcement, or CMS/FHFA/HUD fact sheet.
- BLS — Consumer Price Index(published )
Figures are updated whenever the IRS, SSA, CMS, FHFA, HHS, or BLS publishes a new inflation adjustment or statutory change. This tool is for educational purposes only and does not constitute tax, legal, or investment advice. Consult a qualified professional for decisions affecting your personal finances.