On 13 October 2026, the 10-year Treasury Inflation-Protected Security (TIPS) offered a real yield of 2.88%, while the regular 10-year Treasury yielded 5.21%, according to the US Treasury's daily par yield curve data. The gap, about 2.33 percentage points, is the price of the umbrella. Financial pros call it breakeven inflation.
This guide shows you how real yield and breakeven work, how the principal adjustment is calculated, and where investors get caught out. TIPS are issued by the US government, but many countries sell similar inflation-linked bonds, so the framework applies wherever you invest. For background on how bond prices react to rates, see our guide to bond duration.
Daily Treasury par real yield curve, 13 October 2026. Source: US Department of the Treasury.
What Are Inflation-Protected Bonds?
Inflation-protected bonds are bonds whose principal is adjusted for changes in a consumer price index. The best-known example is TIPS, issued by the US Treasury. Other markets run their own versions, usually called inflation-linked bonds or linkers. The mechanics are similar everywhere, but the price index, the indexation lag and the tax treatment differ, so check the rules in your own market.
According to TreasuryDirect, the US sells TIPS for terms of 5, 10 or 30 years. Unlike a regular Treasury, where the principal is fixed, the principal of a TIPS can go up or down over its term. At maturity, if the adjusted principal is higher than the original amount you receive the higher amount. If it is equal to or lower, you receive the original amount.
Interest works in two steps. The bond pays a fixed coupon rate every six months, but that rate is applied to the adjusted principal. When inflation lifts the principal, each interest payment grows with it. When prices fall, payments shrink.
The yield quoted on a TIPS is a real yield, meaning the return above inflation. A 2.88% real yield means that if you buy at that level and hold to maturity, you earn 2.88% a year plus whatever the price index adds to your principal.
2.88% is the 10-year TIPS real yield on 13 October 2026, against 5.21% on the regular 10-year Treasury.
Why Inflation-Protected Bonds Matter
A regular bond promises fixed dollar payments. If inflation runs hotter than expected, those payments buy less every year, and the loss compounds over a 10 or 30 year hold. Our primer on how inflation erodes savings shows how quickly that adds up.
Real yields also tell you something about the whole market. At a 10-year TIPS auction on 21 May 2026, the real yield came in at 2.169%, according to Tipswatch. By the 17 September 2026 reopening, a $19 billion offering cleared at 2.653%, the highest for that term since an auction in October 2008. Demand looked soft, with a bid-to-cover ratio of 2.24, and the sale followed a Federal Reserve decision that week to raise interest rates.
$19 billion of 10-year TIPS sold at a 2.653% real yield on 17 September 2026, the highest for the term in nearly 18 years.
For long-term investors, that matters. A positive real yield of this size means you can lock in purchasing-power growth with government backing, something that was hard to find for much of the past decade. It also gives you a clean benchmark: any risky asset you own should offer a return well above the real yield to justify its volatility. Compare it with the nominal curve in our explainer on yield curve inversion.
How to Evaluate Inflation-Protected Bonds
Use this five step framework before you buy any inflation-linked bond or fund. It takes about ten minutes once you know where the numbers live.
Step 1: Read the real yield
Start with the real yield, not the headline coupon. The Treasury publishes a par real yield curve every business day. Compare it with the matching nominal par yield curve for the same maturities. The table below shows both for 13 October 2026.
Real yield, nominal yield and breakeven inflation, 13 October 2026
Source: US Department of the Treasury par yield curves. Breakeven is nominal yield minus real yield, calculated for this article.
Step 2: Calculate breakeven inflation
Breakeven inflation is the nominal yield minus the real yield for the same maturity. For the 10-year point, 5.21% minus 2.88% gives 2.33%. If average inflation over the next ten years exceeds 2.33% a year, the TIPS ends up ahead of a regular Treasury. If inflation averages less, the regular Treasury wins.
Think of it as the umbrella price. You pay for protection through a lower starting yield, and you win the bet only if actual inflation beats the market's forecast.
Nominal par yields, 13 October 2026. The 10-year yield of 5.21% less the real yield of 2.88% gives breakeven near 2.33%.
Step 3: Compare breakeven with your own inflation view
Ask a simple question: will average inflation over my holding period be above or below the breakeven? Many central banks target inflation of about 2%, so a 2.33% breakeven prices in a slight overshoot. If you expect inflation to settle near target, a regular Treasury is the better deal. If you expect persistent overshoots, the TIPS looks cheap.
Step 4: Match the maturity to your goal
A TIPS held to maturity locks in its real yield, whatever happens to prices on the way. A bond fund has no maturity date, so its return depends on where real yields are when you sell. If you need money in a specific year, a single bond or a ladder of bonds maturing that year gives you certainty that a fund cannot. Our fixed income beginner guide explains ladders in detail.
Step 5: Check the account and the tax rules
In some countries, including the US, the yearly increase in a TIPS principal is taxed as income in the year it accrues, even though you only collect the cash at maturity. Holding these bonds inside a tax-advantaged retirement account can remove that mismatch. Check how your own tax authority treats inflation-linked bonds before you buy in a taxable account.
Real Examples
Numbers make the mechanics concrete. The first example is a simple illustration with round figures. The second uses the real auction yields quoted above.
Example 1: A $10,000 bond with a 2% coupon
Suppose you hold $10,000 of inflation-protected bonds with a 2% coupon, and the price index rises 3% in year one. Your adjusted principal becomes $10,300, and the year's interest is 2% of $10,300, or $206, compared with $200 on an unadjusted bond. Both your principal and your income moved with prices.
Example 2: Breakeven scenarios on the 10-year
Using the 13 October 2026 pricing, here is how the 10-year TIPS compares with the regular 10-year Treasury at three inflation outcomes.
TIPS versus regular 10-year Treasury, by average annual inflation
Approximate TIPS return is the 2.88% real yield plus average inflation. It is an illustration, not a forecast.
4.38% versus 5.21% is the shortfall a TIPS investor would carry if inflation averaged 1.5% instead of the 2.33% breakeven.
Example 3: Edge cases that change the result
Edge cases that surprise investors
The second row is the one that hurts. Higher real yields mean lower prices, so an investor who bought near the May level and sold after the September rise would have been sitting on a paper loss even though inflation protection was working as designed.
Common Mistakes
Mistake 1: Assuming inflation-protected means risk-free
The principal adjustment protects you from inflation, not from interest rate moves. A long TIPS can lose real money when real yields rise, which is why duration still matters. The 30-year real yield of 3.28% on 13 October 2026 shows how much compensation the market demands for locking in that long a maturity.
Mistake 2: Ignoring the breakeven
Buying TIPS because inflation is in the news is a bet on the headlines, not on the price. If breakeven already sits above the inflation you expect, you are overpaying for the umbrella. Run the subtraction every time.
Mistake 3: Comparing a fund's yield with a bond's
A bond held to maturity delivers a known real yield. A fund quotes a trailing or current yield that changes daily and can even turn negative. They are different products with different risks, so compare like with like.
Mistake 4: Forgetting the tax on phantom income
In some tax systems you owe tax on the principal adjustment each year without receiving any cash. In a taxable account, that cash drag can quietly reduce the real yield you thought you locked in.
Mistake 5: Confusing the index with your own inflation
TIPS follow a national consumer price index, not your personal basket. If your costs rise faster than the index because of rent, tuition or healthcare, the bond will under-protect you. Treat TIPS as one layer of protection, alongside diversification. See our guide to portfolio diversification for the other layers.
TreasuryDirect explains how TIPS principal and interest work. Always read the issuer's rulebook before you buy.
Frequently Asked Questions
Are inflation-protected bonds worth buying when real yields are high?
A real yield near 2.88% is attractive by recent standards because it is a return above inflation with a government guarantee on the payments. Whether it is worth it for you depends on your time horizon and how your inflation view compares with the 2.33% breakeven.
What is breakeven inflation in plain terms?
It is the inflation rate that makes a TIPS and a regular Treasury of the same maturity earn the same return. You get it by subtracting the real yield from the nominal yield.
What happens to inflation-protected bonds if inflation falls?
Your principal adjusts downward as the index falls, and interest payments shrink with it. At maturity, TreasuryDirect says you still receive no less than the original amount, so the downside to principal is limited if you hold to maturity.
Are inflation-linked bonds better than regular bonds?
Neither is better in every case. Inflation-linked bonds win when inflation beats breakeven, and regular bonds win when it falls short. Many investors hold both, which spreads the bet.
Key Takeaways
Back to the umbrella. Inflation-protected bonds are not a way to beat the market, they are a way to buy a known level of protection. The price you pay is the breakeven, and the only question that matters is whether you expect heavier rain.
- Real yield is the return above inflation. On 13 October 2026 the 10-year TIPS real yield was 2.88%.
- Breakeven inflation equals the nominal yield minus the real yield, about 2.33% on the 10-year that day.
- TIPS beat regular Treasuries only when average inflation exceeds breakeven.
- Held to maturity, a TIPS locks in its real yield and returns at least the original principal.
- Higher real yields lower bond prices, so duration risk is real.
- Check the tax treatment of the inflation adjustment before buying in a taxable account.
What to Watch Next
- Does the 10-year real yield stay above 2.65%, the September auction level, or fall back toward May's 2.169%?
- Does 10-year breakeven stay near 2.33%, or does it move toward the 30-year level of 2.28%?
- Does demand at the next TIPS auction hold above the 2.24 bid-to-cover ratio from September?
- Do further central bank rate rises push real yields on 5-year TIPS above 2.67%?
This article is educational and is not personal financial advice. Check current figures and your local tax rules before you invest.