Why treasury inflation-protected security matters
TIPS provide direct contractual exposure to U.S. inflation and real yields, supporting purchasing-power protection and inflation-sensitive liability management.
How it is applied
Investors review real yield, maturity, index ratio, inflation lag, accrued principal, deflation floor, breakeven inflation, tax treatment, liquidity, and duration. TIPS principal adjusts with the non-seasonally adjusted US CPI-U under published indexation rules, and coupon payments apply to the adjusted principal. Investors compare real yield with nominal Treasury yield through break-even inflation, then account for liquidity, tax, maturity, and the indexation lag.
Portfolio example
If indexed principal rises from $1,000 to $1,030, a 1% coupon rate is applied to the higher amount, increasing the dollar coupon payment. A TIPS has original principal 1,000 and a 1% coupon. If its reference index rises 4%, adjusted principal becomes 1,040 and annual coupon cash becomes 10.40. At maturity, the investor receives inflation-adjusted principal or the original principal if the contractual deflation floor applies.
How to interpret it
TIPS can lose market value when real yields rise even while inflation is positive. Relative value versus nominal Treasuries depends partly on future inflation and liquidity premiums. TIPS protect contractual principal against the referenced cumulative inflation measure when held under the instrument’s rules, but their market price moves with real yields. They outperform comparable nominal Treasuries when realized inflation and pricing effects exceed the initial break-even after relevant adjustments.
Limitations and common misconceptions
CPI may not match personal inflation, adjustments occur with a lag, and taxable investors can owe tax on principal increases before maturity. Deflation and sale before maturity affect outcomes. CPI-U may not match an investor’s personal inflation, and the index operates with a lag. Taxable investors can owe tax on principal accretion before receiving it in cash. Rising real yields can produce substantial mark-to-market losses. The maturity floor does not prevent interim price declines or foreign-exchange loss. Performance attribution should separate real-yield movement, inflation accrual, coupon income, roll, and liquidity. This prevents an inflation-linked label from hiding a duration-driven loss. Investors matching a future real liability should compare the bond’s index, maturity cash flow, tax account, and holding horizon with the actual obligation.
Sources and further reading
- TIPS in DepthU.S. Department of the Treasury
- Fixed-Income Bond Valuation: Prices and YieldsCFA Institute