What Are TIPS? A Beginner’s Guide

A government bond can repay every promised dollar and still leave its owner with less purchasing power. Treasury Inflation-Protected Securities, or TIPS, address that problem by linking principal to a consumer-price index.

The adjustment does not make their trading prices stable. This guide builds on our explanations of inflation, bond yield, and bond duration to explain what TIPS protect, how their payments work, and which risks remain.

What Are TIPS?

TIPS are marketable debt securities issued by the US Treasury. Their principal adjusts with inflation and deflation, while a fixed coupon rate determines interest payments on that adjusted amount.

TreasuryDirect explains that new TIPS are issued with five-, 10-, or 30-year terms and pay interest every six months. They can be held to maturity or sold in the secondary market.

Three numbers need to be kept separate: original principal, inflation-adjusted principal, and market price. They perform different roles in the contract and can move differently.

How the Inflation Adjustment Works

The adjustment follows the non-seasonally adjusted Consumer Price Index for All Urban Consumers, or CPI-U. Treasury uses an index ratio to translate changes in the reference index into an adjusted principal balance.

That reference index measures a broad consumption basket. Your household’s costs may rise faster or slower because your spending differs. The mechanism also uses published index data with a lag, so it does not respond instantly to every price change you observe.

Treasury’s TIPS explanation describes the indexing process. The principal adjustment is separate from an investor’s ability to sell the security for a particular market price.

A Simple Coupon Example

Consider a hypothetical TIPS with $1,000 original principal and a 2% annual coupon. With adjusted principal of $1,000, its next semiannual payment would be $10: half the annual coupon rate multiplied by principal.

If indexed principal is $1,030 at the next payment date, the coupon payment becomes $10.30. The coupon rate remains 2%; the dollar payment changes because the balance used in the calculation has increased.

If adjusted principal later falls to $1,020, the corresponding semiannual payment becomes $10.20. These are simplified payment-date examples, excluding accrued interest, taxes, and dealing costs. They are not current market quotes or forecasts.

The increase in principal is not another cash coupon paid into the investor’s account immediately. It changes the indexed balance used for subsequent calculations and eventual redemption.

What the Maturity Floor Covers

At maturity, Treasury pays the greater of the inflation-adjusted principal or the security’s original principal. This provides a floor against cumulative deflation over the security’s life.

The floor applies to original principal, not necessarily the amount a later buyer pays. Suppose an investor pays $1,150 for a security with $1,000 original principal. The contractual floor alone does not guarantee repayment of that $1,150 purchase cost.

It also does not guarantee an early sale price. A holder who needs cash before maturity must accept the market terms available at the time.

Why TIPS Prices Can Fall During Inflation

TIPS trade at prices that reflect real yields, time remaining, and market conditions. When the real yield required by buyers rises, the price of an existing TIPS generally falls, even if its indexed principal is increasing.

For example, a $30 increase in adjusted principal does not stop a larger decline in market value caused by repricing. The contract’s indexing mechanism and the market’s valuation operate together.

Longer-duration holdings generally respond more strongly to yield changes. Our duration guide explains the sensitivity. Treasury also permits negative real yields at auction; a positive coupon does not by itself establish a positive real investment yield.

Real Yield and Breakeven Inflation

Conventional Treasury yields are quoted in nominal terms, while TIPS yields are quoted in real terms relative to their inflation adjustment. Comparing similar maturities gives a market measure commonly called breakeven inflation.

If a nominal Treasury yields 4% and a comparable TIPS yields 1.5% in real terms, the simple difference is 2.5 percentage points. These hypothetical figures illustrate the comparison, rather than an exact trading rule.

The San Francisco Fed explains that breakeven inflation contains inflation-risk and liquidity premiums as well as expectations. It should be read as market-priced inflation compensation, with those influences kept in view.

Individual TIPS and TIPS Funds

An individual security has a defined maturity date and its own contractual repayment terms. A conventional open-ended TIPS fund continually manages a portfolio and does not promise to repay an investor’s purchase amount on a personal maturity date.

Fund value reflects the market prices of the holdings, expenses, and portfolio decisions. Investor.gov warns that government-bond funds can lose money when interest rates rise.

Target-maturity funds have different structures, so their termination arrangements require a separate review. Our ladder guide explains how maturity dates can organize expected repayments.

Tax Timing and Cash Flow

For US federal tax purposes in a taxable account, inflation increases in principal generally must be reported as original issue discount even before that principal is repaid. Coupon interest is another component of taxable income.

The IRS describes this treatment in Publication 550. It can create a mismatch between reportable income and cash received. Account type, investor circumstances, and jurisdiction affect the applicable treatment, so tax comparisons should use the relevant rules.

How TIPS Differ From I Bonds

Both instruments reference inflation, but Series I savings bonds are not marketable securities. Their interest accrues until redemption, while TIPS make semiannual coupon payments and can trade in the secondary market.

Treasury’s comparison also distinguishes their purchase limits, tax timing, and early-access rules. The products should not be treated as interchangeable simply because both provide inflation-related adjustments.

What to Check Before Comparing TIPS

Read the purchase price, real yield, maturity, adjusted principal, and original principal together. Then consider when cash is needed, whether an early sale is likely, and how tax liabilities will be funded.

Compare an individual TIPS with the actual alternative being considered, using compatible maturities and costs. Inflation protection is a specific contractual feature; its usefulness depends on the price paid and the investor’s cash-flow timetable.