Why inflation-linked bond matters
These bonds help investors separate real yield from expected inflation and can hedge inflation-sensitive liabilities. Their market prices still move with real interest rates, liquidity, taxes, index lags, and changing inflation expectations.
How it is applied
For U.S. Treasury Inflation-Protected Securities, principal is adjusted using the Consumer Price Index and the fixed coupon rate is applied to adjusted principal. Other jurisdictions use different indices, lags, floors, and tax rules. Investors separate real yield, expected inflation compensation, indexation lag, and any deflation floor. Cash flows should be modeled using the bond’s specified price index and reference lag. Relative value is often assessed against nominal government bonds through break-even inflation, adjusted for liquidity and market-specific features.
Portfolio example
A bond starts with $1,000 principal and a 1% coupon. If its reference index rises 3%, adjusted principal becomes about $1,030 and annual coupon becomes about $10.30, subject to contractual timing and rules. If principal begins at 1,000 and the applicable inflation index rises 3%, inflation-adjusted principal becomes 1,030. A 1% coupon applied to that balance pays 10.30 rather than 10. At maturity, contractual floor rules determine whether deflation can reduce principal below its original amount.
How to interpret it
The quoted real yield is the return above the bond’s specified inflation adjustment if held under its assumptions. Breakeven inflation compares nominal and real yields, but also contains liquidity and risk premiums. A positive nominal return does not guarantee a positive real return because the bond’s market price responds to changes in real yields. Outperformance versus nominal bonds generally requires realized inflation and pricing effects to exceed the market’s initial break-even expectation. Currency also matters for foreign investors.
Limitations and common misconceptions
The chosen index may not match an investor’s personal inflation. Indexation is delayed, deflation treatment varies, and taxable investors may owe tax on principal adjustments before receiving cash. Real yields can rise and cause market losses. The referenced consumer-price index may not match an investor’s spending pattern. Indexation is delayed, taxes may apply to inflation accrual before cash is received, and market liquidity can vary. Real yields can rise sharply, causing losses even while reported inflation remains high.
Sources and further reading
- TIPS in DepthU.S. Department of the Treasury
- Fixed-Income Securities: Defining ElementsCFA Institute