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Inflation-Linked Bonds vs. Conventional Bonds: How They Work, Returns and Risks

Inflation-linked bonds adjust payments with an official price index, while conventional bonds promise nominal cash flows. Here’s how their returns and risks differ.
From TheFinanceBase Team4 min to read
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Inflation-linked bonds adjust some cash flows using a published price index; conventional fixed-rate bonds promise fixed nominal payments. Linkers can help preserve purchasing power against the index they track, but neither type is guaranteed to outperform, and either can lose market value if sold before maturity.

How conventional and inflation-linked bonds work

Conventional fixed-rate bonds

A conventional fixed-rate bond pays its stated coupon during its life and repays principal at maturity. Its cash flows are nominal: inflation can reduce what those payments buy. The SEC’s Investor.gov explains that “Inflation reduces purchasing power, which is a risk for investors receiving a fixed rate of interest.” Investor.gov’s bond FAQ describes this risk.

U.S. Treasury Inflation-Protected Securities (TIPS)

TIPS use a Bureau of Labor Statistics CPI measure to adjust principal. Treasury sets the coupon rate at auction and pays interest every six months; because the fixed rate is applied to adjusted principal, the dollar interest payment changes as principal changes. TreasuryDirect says TIPS are issued in 5-, 10- and 30-year terms. TreasuryDirect’s TIPS page sets out the product terms.

Principal may rise with inflation or fall with deflation during the term. At maturity, Treasury pays the greater of adjusted principal or original principal. That floor applies to the maturity payment, not to the price an investor can get by selling earlier.

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UK index-linked gilts

UK conventional gilts pay a fixed cash coupon every six months and repay principal at maturity. Index-linked gilts adjust coupons and principal in line with the Retail Prices Index (RPI), subject to an indexation lag. These are UK instrument terms, not rules that should be assumed for U.S. TIPS. See the UK Debt Management Office’s About Gilts page.

Can TIPS or other inflation-linked bonds lose money?

Yes. The inflation adjustment does not prevent a market-price decline before maturity. Bond prices generally fall when relevant yields rise; for an inflation-linked bond, rising real yields can outweigh the increase in inflation-adjusted principal. Treasury explains the inverse relationship between prices and yields in its pricing and interest-rate guide.

If you sell before maturity, the sale price reflects market conditions at that time and may be below what you paid. A TIPS maturity floor does not guarantee that an early seller gets the original principal back. An individual bond held to its scheduled maturity also differs from a bond fund: a fund generally does not promise to return your purchase principal on a personal target date.

TIPS vs. I Bonds: they are different products

TIPS are marketable Treasury securities whose prices can move in the market before maturity. I Bonds are a separate U.S. savings bond product; their terms and purchase and redemption rules should not be inferred from TIPS mechanics. The TIPS principal-adjustment and maturity-floor description above applies to TIPS, not automatically to I Bonds.

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What drives returns: compare yields, inflation and price

A conventional bond’s yield reflects its purchase price and promised nominal cash flows. For an inflation-linked bond, investors commonly focus on real yield, while indexation affects the future nominal cash flows. The relative result depends in part on inflation actually recorded by the bond’s index compared with inflation compensation already reflected in market pricing. This is a framework for comparison, not a forecast or a guarantee of outperformance.

A precise breakeven comparison must account for compounding conventions, maturity, index lags, liquidity, taxes and each security’s terms. Coupon rates alone are not enough: compare yields at the price you would actually pay. There is no synchronized, date-stamped yield comparison here, so no claim that one type currently offers a higher expected return is warranted.

Risks and limits to consider

Index and personal-inflation mismatch

Indexation follows a specified official measure, not each household’s personal spending. U.S. TIPS use a Treasury-specified CPI measure, while UK index-linked gilts use RPI. Your own costs may rise faster or slower, and the relevant geography and index matter.

Indexation lag and deflation

UK RPI-linked cash flows include an indexation lag, so current inflation does not immediately flow through to every payment. TIPS principal can decline during a deflationary period, although Treasury’s original-principal floor applies when TIPS mature. Do not assume another country’s securities have the same floor.

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Duration, liquidity and reinvestment

Longer-duration bonds are more sensitive to yield changes. An investor who must sell early may face an unfavorable price, and liquidity can weaken in stressed markets. Coupon payments also have to be reinvested at whatever rates are then available. These risks affect implementation as well as the headline inflation adjustment.

Tax and issuer risk

Tax treatment of coupons and principal adjustments varies by jurisdiction and account type; check current guidance from the relevant tax authority. Inflation linkage also does not remove the issuer’s credit or political risk.

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How to compare the two for your situation

  1. Set the currency and holding period. Identify the currency of your future spending and whether you can hold an individual bond to maturity or may need to sell sooner.
  2. Match the inflation measure. Check the specific index and any lag. A bond linked to a foreign or differently constructed index may not track your household costs.
  3. Compare maturity and duration. Align the time horizon where practical; longer duration usually means more sensitivity to yield changes.
  4. Compare yields at the purchase price. Look at nominal yield for conventional bonds and real yield for linkers, rather than comparing coupon rates alone.
  5. Consider expected versus realized inflation. High inflation may already be reflected in market prices and linker yields; the outcome depends on what the index records over your holding period.
  6. Account for liquidity, costs and taxes. Include the possibility of an early sale, trading spreads, fund fees where relevant, and current local tax rules.

The choice is therefore price- and scenario-dependent. An inflation-linked bond is not automatically the better bond during every inflationary spell; the index, yield, duration, entry price and holding period all shape the result.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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