TIPS Real Return Calculator

How TIPS Work

Treasury Inflation-Protected Securities (TIPS) are U.S. government bonds whose principal adjusts upward with the Consumer Price Index for All Urban Consumers (CPI-U). The coupon rate is fixed at issuance — the "real yield" — but is paid as a percentage of the inflation-adjusted principal. Example: a $10,000 TIPS with 1.8% real coupon and 3% inflation in the first year sees principal grow to $10,300, with the next coupon paid at 1.8% of $10,300 = $185.40 (vs $180 if there had been no inflation). At maturity, you receive the higher of the inflation-adjusted principal or original face value — so deflation risk is eliminated. Per TreasuryDirect TIPS guidance, TIPS are issued in 5, 10, and 30-year terms, with auctions roughly every two months. The 5-year TIPS were reintroduced in 2010 after a 9-year hiatus.

Breakeven Inflation — The Most Important TIPS Concept

The "breakeven inflation rate" is the difference between the nominal Treasury yield and the TIPS real yield at the same maturity. If actual CPI inflation over the holding period exceeds the breakeven, TIPS outperform nominal Treasuries; if inflation is lower, nominal Treasuries win. Example: 10-year Treasury at 4.3%, 10-year TIPS at 1.8% real = 2.5% breakeven. If average inflation is 3% over 10 years, TIPS wins; if inflation is 2%, nominals win. The breakeven represents the market's expected inflation, baked into bond prices. Per the Federal Reserve research on inflation expectations, the breakeven is a real-time gauge of inflation expectations and is closely watched by the Fed and bond traders. The 5-year breakeven has historically averaged 2.0-2.5%, the 10-year 2.2-2.8%, with spikes above 3% during inflation shocks (2008, 2022).

TIPS Tax Trap — The "Phantom Income" Problem

The biggest TIPS gotcha: the inflation adjustment to principal is taxed as ordinary income in the year it accrues, even though you don't receive the cash until maturity. This "phantom income" creates a tax liability without a corresponding cash flow, especially during high-inflation periods. Example: a $10,000 TIPS during a 7% inflation year sees principal rise to $10,700 — that $700 of phantom income gets taxed at your marginal rate even though the principal isn't paid until maturity. For a 24% bracket investor, that's $168 of cash tax owed on a non-cash gain. Solution: hold TIPS in tax-advantaged accounts (IRA, 401k, HSA) where phantom income is irrelevant. Holding TIPS in a taxable account makes sense only for high-net-worth investors who actively need inflation hedging in taxable accounts and accept the tax drag. Source: IRS Publication 550 on investment income.

TIPS vs I-Bonds — Different Products

TIPS and I-Bonds are both inflation-protected Treasury products, but they're structurally different. TIPS: marketable securities with a real yield + CPI adjustment, can be sold any time, with phantom income tax in taxable accounts. I-Bonds: non-marketable, $10,000 annual purchase limit per person ($5,000 more via tax refund), fixed rate + inflation rate set every 6 months, must hold 12 months minimum, and tax-deferred until redemption. I-Bonds are best for small, fully-tax-deferred inflation hedging up to $10,000 per year per person; TIPS are best for larger inflation-protected allocations in tax-advantaged accounts. A retirement portfolio targeting strong inflation defense often uses both: max out I-Bonds annually, then put additional inflation hedge into TIPS held in an IRA. Last updated May 2026.