Treasury Inflation-Protected Securities (TIPS)

A Treasury Inflation-Protected Security — or TIPS — is a Treasury security whose principal value is adjusted semi-annually based on changes in the Consumer Price Index. Unlike conventional Treasury bonds, which pay a fixed coupon on a fixed principal, TIPS pay a fixed real coupon on a principal that rises (or falls) with inflation.

How TIPS work: principal adjustment and real yields

A TIPS security with a 2% coupon and initial $1,000 principal will pay $10 every six months (1% of the current principal) and $1,000 at maturity — but only if there is no inflation. If the Consumer Price Index rises 3% over the first six months, the principal adjusts upward to $1,030. The next coupon payment becomes $10.30 (1% of $1,030). If inflation rises again in the second half, the principal adjusts again.

Over a 10-year TIPS holding period, if cumulative inflation reaches 25%, the principal grows from $1,000 to $1,250. The holder receives coupons based on this larger principal and receives $1,250 at maturity instead of $1,000. The 2% coupon is a real yield — the return after inflation, not before.

This structure inverts the inflation risk of conventional Treasury bonds. A conventional 10-year Treasury note at 3% yields 3% nominally. If inflation averages 4% over those 10 years, the real return is negative (3% nominal minus 4% inflation). A TIPS at 1% real yield will deliver exactly 1% real return no matter what inflation does, because the principal adjusts automatically.

The breakeven inflation rate

The difference between conventional Treasury yields and TIPS yields is called the “breakeven inflation rate” — it reflects the market’s expectation of average inflation over the security’s remaining life. If the 10-year Treasury note yields 4% and the 10-year TIPS yields 1.5%, the breakeven inflation rate is approximately 2.5% (4% - 1.5%).

When breakeven inflation is high, it means the market expects strong future inflation and is compensating conventional Treasury holders accordingly. When breakeven inflation is low, it suggests the market expects inflation to remain subdued. The breakeven inflation rate is one of the Fed’s most-watched economic indicators — it signals what the market truly believes about future inflation independent of Fed guidance.

During periods of deflation or very low inflation, TIPS yields can go deeply negative in real terms (though usually not more negative than a few hundred basis points). Even then, a TIPS investor knows they will earn that real yield — no surprises from future price increases.

Investment uses and limitations

TIPS are primarily used by long-term investors seeking to lock in a real return independent of future inflation. Pension funds, endowments, and insurance companies use them to protect the purchasing power of their long-dated liabilities. An endowment with 30-year spending commitments can buy 30-year TIPS and know with certainty that the real value of payouts will be preserved.

Individual investors often buy TIPS through mutual funds or ETFs as an inflation hedge within a diversified portfolio. In inflationary periods, TIPS can significantly outperform conventional Treasuries. In deflationary periods, TIPS underperform because the principal adjusts downward.

A crucial limitation is the tax treatment. TIPS holders owe federal income tax on the coupon payments (as with all Treasury securities) but also on the phantom income created by principal adjustments. A TIPS investor receives no cash from the principal adjustment — it simply increases the amount due at maturity — yet must pay tax on it annually. This makes TIPS most attractive inside tax-deferred accounts like IRAs or pension funds rather than in taxable brokerage accounts.

TIPS and real interest rates

Real interest rates — the yield on TIPS — are distinct from nominal rates and are particularly sensitive to Fed policy and growth expectations. When the Fed raises real rates (by raising nominal rates faster than inflation rises), TIPS yields rise and prices fall. When the Fed cuts real rates, TIPS yields fall and prices rise.

In the 2010s, real interest rates (TIPS yields) fell close to zero as the Fed maintained accommodative policy and inflation remained low. When the Fed pivoted to aggressive rate hikes in 2022, real rates rose sharply, causing TIPS prices to decline significantly. This demonstrates that TIPS are not risk-free — they carry duration risk just like conventional bonds, and they carry deflation risk (principal declines if the CPI falls).

The TIPS market and supply

The Treasury issues TIPS at regular intervals — 5-year, 10-year, and 20-year maturities are most common. The secondary TIPS market is considerably less liquid than the conventional Treasury market, with wider bid-ask spreads. Institutional investors and hedge funds are the dominant traders.

TIPS never became as dominant as some economists expected in the early 2000s, partly because of the tax complications and partly because investors remained skeptical of long-term inflation concerns. However, after sustained inflation in 2021–2023, institutional interest in TIPS revived substantially.

See also