Treasury Inflation-Protected Securities (TIPS): How They Work and When They Make Sense

Forrukh Abdullah October 11, 2026

The U.S. Treasury began issuing inflation-indexed securities in 1997. The basic idea was simple: adjust the bond’s principal with inflation so that its payments respond to changes in consumer prices.

Nearly thirty years later, that mechanism remains straightforward. What is less obvious is what “inflation-protected” actually means.

TIPS adjust for inflation, but their market price can still fall sharply when real interest rates rise. Understanding that distinction is the key to knowing when TIPS provide useful protection and when they can still disappoint.

Why Fixed-Rate Bonds Have an Inflation Problem

A traditional Treasury bond pays fixed coupon payments in nominal dollars and returns a fixed principal amount at maturity. What the contract does not include is any adjustment for inflation.

If inflation turns out higher than expected, those fixed dollars lose purchasing power. The investor can receive every payment exactly as promised and still end up worse off in real terms.

For example, a bond earning about 2% a year while inflation averages 3% produces a real return of roughly -1% before taxes. Over long periods, even a modest gap like that can meaningfully erode purchasing power.

The TIPS Solution

Treasury Inflation-Protected Securities address this problem by adjusting their principal for inflation.

When CPI rises, the principal increases. When CPI falls, the principal can decrease. Because the coupon rate is applied to the adjusted principal, the dollar amount of the coupon payments also rises or falls with inflation.

At maturity, the investor receives the greater of the inflation-adjusted principal or the bond’s original principal amount. That maturity floor protects an investor who holds an individual TIPS to maturity from receiving less than the original principal because of cumulative deflation.

How the Mechanism Actually Works

Consider a simplified example: a $1,000 TIPS with a 1% coupon rate, with inflation averaging 3% a year.

After the first year, 3% inflation would increase the adjusted principal to about $1,030. Because the coupon rate is applied to the adjusted principal, the amount of interest paid also increases.

If inflation continued at 3%, the adjusted principal would rise to about $1,061 after the second year. After ten years, it would reach roughly $1,344.

At maturity, assuming cumulative inflation remained positive, the investor would receive that inflation-adjusted principal rather than the original $1,000.

Actual TIPS calculations are more precise than this annual example. Interest is paid every six months, and Treasury adjusts principal using CPI-U and published index ratios. But the underlying mechanism is simple: inflation changes the principal, and the coupon payments change with it.

Table showing a simplified $1,000 TIPS with a 1% coupon under 3% annual inflation. Adjusted principal rises from $1,000 to $1,343.92 over ten years and the approximate annual coupon rises from $10.00 to $13.44.

What Real Yield Means

The yield quoted on a TIPS is a real yield. It represents the return apart from the bond’s inflation adjustment.

If a 10-year TIPS is purchased at a 2% real yield and held to maturity, the investor has effectively locked in an annualized real return of about 2% above inflation, before taxes. Inflation determines how large the bond’s nominal dollar payments become, while the real yield determines the return in purchasing-power terms.

A nominal Treasury is different. Its yield is quoted in dollars that are not adjusted for inflation. That means a 4.5% nominal Treasury yield and a 2% TIPS real yield cannot be compared simply by asking which number is larger.

The difference between those two yields is where breakeven inflation comes in.

Breakeven Inflation: The Comparison Tool

Breakeven inflation provides a simple way to compare a nominal Treasury with a TIPS of similar maturity.

Nominal Treasury yield – TIPS real yield = breakeven inflation

Suppose a 10-year nominal Treasury yields 4.5% while a 10-year TIPS offers a 2% real yield. The difference is 2.5%, so the breakeven inflation rate is 2.5%.

If inflation over the next ten years averages more than 2.5%, the TIPS should do better, assuming both bonds are held to maturity. If inflation averages less than 2.5%, the nominal Treasury should do better.

That changes the question an investor should ask. It is not simply, “Will inflation be high?” It is, “Will inflation be higher or lower than the level already reflected in bond prices?”

Breakeven inflation is not a perfect forecast of future CPI. Market factors can also influence the spread between nominal Treasuries and TIPS. But as a practical comparison tool, it shows the inflation hurdle TIPS must beat.

The 2022 Lesson

The experience of 2022 shows why the word “inflation-protected” can be misleading if it is interpreted too broadly.

Inflation remained extremely high, yet TIP, the iShares TIPS Bond ETF, lost about 12% for the year.

The reason was real yields.

At the beginning of 2022, the 10-year TIPS real yield was close to -1%. By the end of the year, it was about +1.6%. That sharp rise in real yields pushed TIPS prices lower, just as rising nominal yields push ordinary bond prices lower.

Line chart of the 10-year TIPS real yield from October 2016 to October 2026, highlighting minus 0.97% at the start of 2022, plus 1.58% at the end of 2022, and 2.87% in October 2026.

The inflation adjustment helped offset some of that damage, but it was not enough to overcome the effect of rising real yields.

That is the important distinction: TIPS protect against inflation, but they do not protect against rising real interest rates. A TIPS fund can therefore lose money during a period of high inflation if real yields rise far enough.

The ETF Route

Investors can buy individual TIPS directly or gain exposure through ETFs. TIPS ETFs make it easier to hold a diversified portfolio of inflation-protected Treasuries, but their market value still moves as real yields change.

The main choice is duration.

Broad TIPS funds such as TIP and SCHP hold securities across a range of maturities and therefore carry meaningful interest-rate sensitivity. Short-term funds such as STIP and VTIP hold shorter-maturity TIPS and generally experience smaller price swings when real yields change. Long-duration TIPS funds are much more sensitive.

That distinction matters because two TIPS funds can offer the same basic inflation protection while behaving very differently when real interest rates move. Investors who want inflation protection with less price volatility will generally find shorter-duration TIPS less sensitive than longer-duration alternatives.

A Tax Quirk Worth Knowing (U.S. Investors)

For investors holding individual TIPS in a taxable account, the inflation adjustment creates an unusual tax issue.

When inflation increases the bond’s principal, that increase is generally taxable as federal income in the year it occurs, even though the investor does not receive the adjusted principal until maturity. This is sometimes called “phantom income.”

TIPS ETFs handle the cash flow differently. Their distributions can include the inflation adjustment earned by the underlying securities, giving investors cash alongside the taxable income.

As with other U.S. Treasury securities, TIPS income is generally exempt from state and local income taxes but remains subject to federal income tax.

Because of this annual taxation, some investors prefer to hold TIPS in tax-advantaged retirement accounts when that fits their broader portfolio and tax situation.

When TIPS Make Sense

TIPS are most useful when the investor cares about preserving purchasing power rather than simply receiving a fixed number of dollars.

They can make sense for long-term goals where inflation is a meaningful risk, especially retirement spending that may continue for decades. They are also useful for investors who specifically want protection against inflation turning out higher than the market currently expects.

TIPS are less useful for very short-term cash needs. For money that must remain highly stable and readily available, Treasury bills or ultra-short Treasury funds are generally simpler and less exposed to real-yield movements.

They can also disappoint over shorter holding periods if real yields rise sharply. The inflation adjustment does not prevent the market price of a TIPS or TIPS fund from falling before maturity.