For direct protection against U.S. consumer-price inflation, TIPS are generally the closer match. Their principal is adjusted with the non-seasonally adjusted U.S. City Average All Items CPI-U, and their fixed coupon is calculated on that changing principal. Conventional Treasury notes and bonds keep both principal and coupon fixed in dollars, so unexpectedly high inflation reduces the purchasing power of their payments. Nominal Treasuries can still be the better fit when predictable dollar cash flow matters more, inflation is expected to remain low, or you need a particular maturity or market price. The right choice depends on current yields, time to maturity, taxes, liquidity needs and how closely your expenses track CPI-U.
What you actually own
TIPS link principal to CPI-U
Treasury Inflation-Protected Securities (TIPS) are marketable U.S. Treasury securities issued in 5-, 10- and 30-year terms. The Treasury adjusts their principal using the non-seasonally adjusted U.S. City Average All Items Consumer Price Index (CPI-U), published monthly by the Bureau of Labor Statistics. When the index rises, the security’s adjusted principal rises; when the index falls, the adjusted principal falls.
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The stated interest rate on a TIPS does not reset. Instead, the Treasury applies that fixed rate to the adjusted principal, with interest paid every six months. Consequently, the dollar amount of each coupon can increase or decrease even though the percentage rate printed at issuance stays the same.
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Nominal Treasuries keep dollars fixed
Conventional Treasury notes and bonds—often called nominal Treasuries in this comparison—have a fixed face value and a fixed coupon rate. They return the stated principal at maturity and make scheduled dollar-interest payments along the way. There is no CPI adjustment to compensate for an unexpected rise in prices.
A nominal Treasury can therefore deliver every promised dollar and still lose purchasing power. If your bond pays a 4% annual coupon while your relevant inflation rate is 6%, the cash flow is predictable in dollars but declining in real terms before taxes and fees.
How a TIPS payment changes when inflation changes
An inflation example
Suppose an illustrative TIPS has $1,000 of original principal and a 2% annual coupon, paid in two equal installments. If the CPI adjustment increases principal by 3%, the adjusted principal becomes $1,030. The annual coupon is then 2% of $1,030, or $20.60, so each semiannual payment is $10.30. The coupon rate remains 2%; only the base used to calculate the payment has changed.
In a period of continuing inflation, successive upward index adjustments can increase both the redemption amount and the dollar value of future coupons. The adjustment is calculated by the Treasury’s indexation rules, so it may not match the inflation rate you personally notice in rent, food, medical care or tuition.
A deflation example
If the same $1,000 original principal experiences a 4% downward adjustment, the adjusted principal used for current coupon calculations would be $960. At that point, a 2% annual coupon would produce $19.20 for the year, paid as two $9.60 installments.
At maturity, however, Treasury rules provide a floor: you receive the greater of the inflation-adjusted principal or the original principal. In this illustration, a maturity redemption after that deflation would be at least $1,000. The floor applies to the maturity payment, not to the market price you might receive if you sell earlier.
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TIPS and nominal Treasuries compared
| Feature | TIPS | Nominal Treasury notes and bonds |
|---|---|---|
| Inflation linkage | Principal is adjusted with non-seasonally adjusted U.S. City Average All Items CPI-U. | No indexation; principal remains fixed in dollars. |
| Coupon rate | Fixed percentage rate applied to adjusted principal. | Fixed percentage rate applied to fixed principal. |
| Dollar coupon payments | Can rise or fall as adjusted principal changes; paid every six months. | Remain fixed under the bond’s schedule. |
| Deflation at maturity | Redemption is the greater of adjusted principal or original principal. | Face value remains the contractual redemption amount. |
| Sale before maturity | Market price can be above or below face value; maturity floor does not protect an early sale. | Market price can be above or below face value. |
| State and local income tax | The cited Treasury summary says both securities are exempt from state and local income tax. | The cited Treasury summary says both securities are exempt from state and local income tax. |
| Federal tax timing | Inflation adjustments that increase principal are generally federally taxable when they accrue, even before cash is received at maturity. | Current dollar interest is taxable under applicable federal rules; no inflation adjustment is created. |
| Current yield or price | Not provided here; changes with market conditions and maturity. | Not provided here; changes with market conditions and maturity. |
Are TIPS better when inflation is high?
When inflation runs above what was reflected in a nominal bond’s price and coupon, TIPS normally provide the more direct hedge because their principal and coupon base move with CPI-U. A nominal bond’s promised payments do not change, so the investor bears the full loss of purchasing power.
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That does not make every TIPS purchase profitable in every high-inflation episode. The price you pay already reflects market expectations, the fixed TIPS coupon may be low or negative in real terms, and rising interest rates can reduce the market value of a long-maturity TIPS before maturity. A buyer who sells early can realize a loss even while the index-adjusted principal is increasing.
Conversely, a nominal Treasury can outperform a TIPS if inflation stays below the rate implied by the relative prices at purchase. Because current yields and market-implied inflation expectations change daily, a security-specific decision requires contemporaneous quotes rather than a permanent rule that one type always wins.
What happens if inflation falls or turns negative?
Falling inflation
If prices continue rising but at a slower rate, TIPS principal may still increase, just more slowly. Nominal Treasury payments do not respond to either the level or the change in inflation. The comparison therefore depends on the inflation path that the market price already anticipates, not merely on whether the latest monthly CPI reading is higher or lower than the previous one.
Deflation
With deflation, TIPS adjusted principal declines and the next coupon is calculated on that lower amount. The maturity guarantee prevents the redemption value from falling below original principal, assuming you hold the security to maturity. There is no equivalent CPI mechanism on a nominal Treasury because its principal is already fixed.
Before maturity, either security can trade below its face value. A TIPS maturity floor is not a promise that an exchange, broker or dealer will pay you par today. Market interest rates, expected inflation, remaining term and liquidity all influence the price available for an early sale.
Cash-flow predictability versus purchasing-power protection
When fixed dollars are the priority
Nominal Treasuries make budgeting straightforward: the coupon amount and scheduled principal repayment are known in dollars when you buy. That can be useful for a liability with a fixed dollar amount, provided you accept that inflation can erode what those dollars buy.
When real spending power is the priority
TIPS trade fixed dollar coupons for an inflation-linked principal. Their payments are less predictable in nominal dollars, but the design seeks to preserve value against CPI-U inflation. Investors funding expenses that tend to rise with broad consumer prices may prefer that linkage, especially for a holding intended to reach maturity.
Neither security eliminates interest-rate risk. If market rates rise after purchase, the price of an existing bond generally falls; if rates fall, its price generally rises. The same marketability applies to TIPS and nominal Treasuries, so a pre-maturity sale can produce a gain or loss unrelated to the maturity guarantee.
Taxes can change the practical result
The TIPS “phantom income” issue
When CPI-U adjustments increase TIPS principal, the increase is generally included in federal taxable income as it occurs, even though the investor may not receive that increase in cash until the security matures or is sold. This mismatch can require cash from another source to pay the tax. It is especially important to examine when TIPS are held in a taxable account during a period of substantial inflation.
State and local treatment
The Treasury summary cited for these securities says interest from both TIPS and nominal Treasuries is exempt from state and local income tax. State rules and filing situations can still be technical, so confirm how your jurisdiction treats the income and any sale gain or loss.
After-tax comparison
Do not compare the quoted TIPS rate with a nominal coupon as though they were identical after-tax returns. Estimate the federal tax on any accruing TIPS adjustment, account for the tax treatment of interest, and consider whether the securities are held in a taxable or tax-advantaged account. The relevant question is how much purchasing power remains after taxes over the period you expect to own the security.
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CPI-U is a useful hedge, not a personal inflation guarantee
TIPS use a broad national index. Your personal inflation rate can differ substantially because your budget may be concentrated in categories whose prices move differently from the all-items CPI-U. A retiree with unusually high medical costs, a renter facing a local housing shortage or a household paying international tuition may experience a different pattern.
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How to decide between TIPS and nominal Treasuries
Start with the purpose of the money
- Known real spending goal: TIPS may fit when maintaining purchasing power is the central objective and you can tolerate changing dollar coupons.
- Known nominal payment: A nominal Treasury may fit when the future obligation is a fixed number of dollars and inflation uncertainty is acceptable.
- Uncertain timing: Compare maturities and liquidity because selling before maturity exposes either security to market pricing.
Check the purchase economics
- Record the maturity date, purchase price, coupon rate and expected holding period for each candidate.
- Obtain current market yields and prices from your purchase channel. These figures change daily and are not supplied by this comparison.
- For TIPS, examine the real yield and the index-adjusted principal conventions; for nominal Treasuries, examine the nominal yield and the inflation assumption you are willing to make.
- Compare the two securities at the same maturity horizon and with the same assumptions about reinvestment of coupons.
- Model federal taxes, including possible taxable TIPS adjustments before cash arrives, and include your state and local situation.
- Decide whether you can hold to maturity. If not, stress-test the price effect of higher rates and changing inflation expectations.
Use a blended approach only for a reason
Owning both types can separate objectives: nominal Treasuries for scheduled dollar liabilities and TIPS for a portion of inflation-sensitive spending. The mix should reflect your liabilities, risk tolerance, tax location and liquidity reserve, not a generic percentage. A blend does not remove market risk or guarantee that your personal expenses track CPI-U.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Buying, holding and selling considerations
Purchase channels
TreasuryDirect identifies TreasuryDirect, banks, brokers and dealers as channels for purchasing marketable Treasury securities. Review the exact offering terms, fees, settlement details and sale procedures on the channel you use. An account’s ability to buy at auction or in the secondary market, and its minimums or commissions, can vary.
Holding to maturity
Holding a TIPS to maturity is the only way to rely on the greater-of-adjusted-principal-or-original-principal redemption rule. It does not guarantee a positive real return after taxes, nor does it prevent the opportunity cost of owning a different security. Holding a nominal Treasury to maturity likewise delivers its contractual dollars but not a guaranteed level of purchasing power.
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Selling early
Both securities are marketable, so you can sell before maturity. The sale price reflects current rates, remaining maturity, inflation expectations and market liquidity. A TIPS investor can face a loss on sale even after years of positive CPI adjustments; a nominal Treasury investor can face the same rate-driven price risk without an inflation-linked principal.
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Common mistakes to avoid
- Confusing coupon rate with return: A TIPS coupon is applied to adjusted principal, while a nominal coupon is applied to fixed principal. Neither quoted coupon alone tells you the result at your purchase price.
- Treating the maturity floor as a daily guarantee: The TIPS floor applies at maturity, not to a secondary-market sale.
- Ignoring tax timing: An increase in TIPS principal can be federally taxable before you receive that increase in cash.
- Assuming CPI-U equals your budget: The index is broad and national; household inflation can differ.
- Using stale market data: Yields, prices and implied inflation expectations change. A historical comparison cannot substitute for the quote available when you invest.
- Matching unlike maturities: Comparing a short nominal note with a long TIPS can make the apparent result reflect maturity and rate risk rather than inflation protection.
Illustrative outcomes
Inflation higher than expected
A nominal Treasury continues paying its scheduled dollars. A TIPS experiences upward principal adjustments, and later coupons are calculated on the larger base. Before taxes and any sale, that gives the TIPS holder a closer mechanical match to CPI-U.
Inflation lower than expected
The TIPS adjustment is smaller than investors may have anticipated, while the nominal Treasury’s fixed payments may look comparatively attractive. The actual winner depends on the prices and yields at purchase, not only on the eventual inflation reading.
Deflation while holding to maturity
TIPS coupons can shrink as adjusted principal declines, but the maturity redemption cannot be below original principal. A nominal Treasury pays its fixed coupon and face value regardless of CPI-U, so its cash flows are steadier in dollars but have no special deflation adjustment.
A practical decision rule
Choose TIPS when your primary question is, “How can this Treasury holding adjust with broad U.S. consumer inflation?” Choose a nominal Treasury when your primary question is, “How many dollars will I receive on each scheduled date?” If both questions matter, compare a same-maturity pair using current prices, model the tax consequences and decide how much early-sale risk you can accept.
No security can guarantee that every expense keeps pace with it. TIPS provide CPI-U linkage and a maturity principal floor; nominal Treasuries provide fixed dollar cash flows. Your inflation outlook, required maturity, tax account and need for liquidity determine which protection is more valuable in your situation.
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