The Ten-Year Treasury Pays 5.28%. After Expected Inflation, 2.92% — and That Is Where This Year's Rise Came From.

On October 7 the ten-year Treasury constant maturity yield was 5.28% and the ten-year inflation-indexed constant maturity yield was 2.92%, according to the Federal Reserve's H.15 release published the following day. The difference between those two numbers, about 2.36 percentage points, is the breakeven inflation rate: the average annual inflation rate at which a buyer of the nominal note and a buyer of the inflation-protected note would end up equally well off.

On January 2 the same pair of yields was 4.19% and 1.94%, a breakeven of about 2.25%. So over nine months the nominal yield rose roughly 109 basis points and the breakeven rose roughly 11. The remaining 98 basis points is the real yield. Whatever has repriced long-term borrowing costs this year, the bond market is not saying it expects materially more inflation.

What a real yield is

Treasury Inflation-Protected Securities pay a fixed coupon on a principal amount that is adjusted for changes in the consumer price index. Their quoted yield is therefore a return above realised inflation, whatever that turns out to be. A nominal Treasury pays a fixed coupon on fixed principal, so its yield has to cover both the real return a lender wants and the inflation the lender expects to lose to. Subtract the first from the second and what is left is the market's compensation for inflation risk and expectation combined.

The whole curve, not just the ten-year

Treasury's daily par yield curve shows the move was not confined to one maturity. These are closing yields for the dates shown:

• January 2, 2026 — 3-month 3.65%, 2-year 3.47%, 10-year 4.19%, 30-year 4.86%
• September 1, 2026 — 3-month 3.92%, 2-year 4.39%, 10-year 4.79%, 30-year 5.27%
• October 7, 2026 — 3-month 4.22%, 2-year 4.77%, 10-year 5.28%, 30-year 5.67%

Measured from the start of the year, the two-year is up about 130 basis points, the ten-year about 109 and the thirty-year about 81. The two-to-ten-year spread has narrowed from about 72 basis points to about 51 over that period. The front end has moved most, which is consistent with a policy rate that has been raised and is expected to be raised again, but the long end has moved a long way too.

Why the level matters mechanically

Real yields are the rate at which future cash flows get discounted once inflation is stripped out, so they set the hurdle for anything financed over a long horizon — a mortgage, a utility project, a government deficit. They also set the government's own cost of funds in real terms. The H.15 release puts the federal funds effective rate at 3.88% on October 7, about 140 basis points below the ten-year, and the bank prime loan rate at 7.00%. The one-month bill was 4.07% and the one-year 4.42%.

A reading, not an explanation

A real yield is an observed price, and the decomposition above is arithmetic. It does not say why the real yield rose. Three candidate explanations — a higher expected path of real policy rates, a larger term premium demanded for holding duration, and the supply of Treasury debt itself — all produce the same observable number, and the published data cannot separate them.