Week 22 Day 3: TIPS: Bonds That Protect Against Inflation

Regular bonds pay a fixed interest rate. If inflation rises, the purchasing power of those fixed payments shrinks. TIPS solve this by linking the bond's principal to the Consumer Price Index. If you buy a TIPS with a 1.5% real yield and inflation is 4%, your total return is approximately 5.5%. The inflation protection is guaranteed by the U.S. government.

How TIPS work: You buy a $1,000 TIPS with a 1.5% coupon. After one year of 4% inflation, your principal adjusts to $1,040. You receive 1.5% interest on the adjusted principal ($15.60 instead of $15). If inflation continues at 4% for 10 years, your principal grows to approximately $1,480 -- you get the full inflation-adjusted amount back at maturity. TIPS vs. nominal Treasuries: If actual inflation exceeds the market's inflation expectation ('breakeven inflation'), TIPS outperform. If actual inflation is lower than expected, nominal Treasuries outperform. The breakeven rate (difference between nominal and TIPS yields of the same maturity) was approximately 2.3% for 10-year maturities in 2024, meaning the market expected 2.3% annual inflation. If you expect more, buy TIPS. TIPS funds: VTIP (Vanguard Short-Term TIPS, 0.04%) -- good for emergency fund supplement. SCHP (Schwab TIPS, 0.05%) -- broader TIPS exposure. TIP (iShares TIPS, 0.19%) -- the largest TIPS fund.

TIPS pricing reveals the market's inflation expectations through the breakeven inflation rate: BEI = Nominal Yield - TIPS Real Yield. However, the breakeven is not a pure inflation forecast. It includes an inflation risk premium (compensation for bearing inflation uncertainty) and a liquidity premium (TIPS are less liquid than nominal Treasuries). Pflueger and Viceira (2016) estimated that the inflation risk premium is approximately 50-100 basis points for 10-year maturities, meaning the true market inflation expectation is about 0.5-1.0% lower than the breakeven implies. D'Amico, Kim, and Wei (2018) at the Federal Reserve estimated that TIPS also carry a negative liquidity premium of approximately 40-80 basis points (TIPS yields are higher than they would be in a perfectly liquid market). For portfolio construction, TIPS serve as an inflation hedge that nominal bonds cannot provide. Bodie (1982) showed that TIPS (or their economic equivalent) are the theoretically risk-free asset for real-return investors, making them ideal for: (1) retirement portfolios where maintaining purchasing power is the primary goal, (2) liability matching for inflation-indexed expenses (healthcare, education), and (3) as the risk-free asset in a mean-variance framework (replacing nominal Treasuries). The optimal TIPS allocation for a retiree is significantly higher than most advisors recommend -- potentially 30-50% of the fixed-income allocation.