The 10-Year Treasury at 5.12% Is a Real-Yield Story: What Treasury's Own Tables Say About Breakevens

September's consumer price index rose 3.7 per cent from a year earlier, above the 3.6 per cent forecast, and the 10-year Treasury yield has spent October above 5 per cent, a level Trading Economics described on 13 October as near 24-year highs. It would be natural to read that as bond investors pricing in a decade of high inflation. Treasury's own data says otherwise. Between 1 and 20 October, the 10-year nominal par yield ranged over 22 basis points. The 10-year breakeven rate, which is what the market's inflation compensation looks like when you subtract the real yield, ranged over 4.

The calculation uses only two public tables from the US Treasury: the daily par yield curve and the daily par real yield curve. Subtracting the second from the first gives an approximate breakeven inflation rate for each maturity. The breakeven figures below are DrafterDaily's arithmetic, not a series Treasury publishes. DrafterDaily has already covered the September inflation print and, in August, the term premium on the 30-year bond; this piece does something different, which is to decompose the 10-year yield itself.

The decomposition in one sentence

A nominal Treasury yield is, to a first approximation, a real yield (what investors demand above inflation) plus a breakeven (what they expect to be compensated for inflation over the same period). Inflation-protected securities, TIPS, reveal the real yield; the gap between the nominal and TIPS yields at the same maturity is the breakeven. If the 10-year nominal yield rises 20 basis points and the real yield rises 20, the market has changed its price for waiting, not its view on prices.

Thirteen sessions of Treasury data

Treasury's tables, read for 1 to 20 October 2026, show the following 10-year par yields. The third figure in each line is the nominal yield minus the real yield (our calculation). Treasury shows no row for 12 October.

• 1 Oct: nominal 5.24%, real 2.88%, breakeven 2.36%
• 2 Oct: nominal 5.28%, real 2.92%, breakeven 2.36%
• 5 Oct: nominal 5.31%, real 2.95%, breakeven 2.36%
• 6 Oct: nominal 5.27%, real 2.91%, breakeven 2.36%
• 7 Oct: nominal 5.28%, real 2.92%, breakeven 2.36%
• 8 Oct: nominal 5.22%, real 2.87%, breakeven 2.35%
• 9 Oct: nominal 5.24%, real 2.91%, breakeven 2.33%
• 13 Oct: nominal 5.21%, real 2.88%, breakeven 2.33%
• 14 Oct: nominal 5.19%, real 2.84%, breakeven 2.35%
• 15 Oct: nominal 5.10%, real 2.78%, breakeven 2.32%
• 16 Oct: nominal 5.09%, real 2.74%, breakeven 2.35%
• 19 Oct: nominal 5.15%, real 2.80%, breakeven 2.35%
• 20 Oct: nominal 5.12%, real 2.77%, breakeven 2.35%

Across those sessions the nominal yield ranged from 5.09 to 5.31 per cent, a span of 22 basis points. The real yield ranged from 2.74 to 2.95, a span of 21. The breakeven ranged from 2.32 to 2.36, a span of 4. From the peak on 5 October to the low on 16 October the nominal yield fell 22 basis points, the real yield fell 21, and the breakeven slipped 1. Put differently, in this window nearly all of the movement in the 10-year yield was a movement in the real yield.

What happened on the days that mattered

On 14 October the September CPI was published: 3.7 per cent year on year against 3.6 expected, with core at 2.6 per cent against 2.5 expected and a monthly headline gain of 0.6 per cent, according to investingLive's summary of the release. The 10-year nominal yield that day eased from 5.21 to 5.19. The real yield fell 4 basis points and the breakeven rose 2, from 2.33 to 2.35 per cent. A hotter-than-expected print therefore moved the market's 10-year inflation compensation by two basis points, which is within the range of ordinary day-to-day noise in these tables.

The next two sessions saw the largest declines. On 15 October the nominal yield fell 9 basis points to 5.10, with the real yield down 6 and the breakeven down 3. On 16 October it slipped another basis point, with the real yield down 4 and the breakeven up 3. Over the two days from 14 to 16 October the nominal and real yields each fell 10 basis points while the breakeven finished unchanged at 2.35 per cent. Sources disagree on why. Trading Economics, on 13 October, attributed an earlier dip to safe-haven demand, falling oil and a global semiconductor selloff. A report published on 15 October by Eastern Herald said traders could not determine whether bonds were acting as a refuge or as a source of risk. Neither establishes a cause for the move in real yields, and the Treasury tables alone cannot either.

On Monday 19 October the 10-year rose 6 basis points, from 5.09 to 5.15. The real yield also rose 6, from 2.74 to 2.80, so the breakeven was unchanged. On Tuesday the yield eased 3 basis points to 5.12 and the real yield fell 3, again leaving the breakeven at 2.35. Treasury's tables stop at 20 October, so we have no data for later sessions.

A 1.35 percentage point gap

The latest breakeven, 2.35 per cent, sits 1.35 percentage points below the 3.7 per cent headline CPI and about 0.25 below the 2.6 per cent core rate (our arithmetic). A 10-year breakeven is an average over a decade, so a gap to a single month's year-on-year reading is expected if investors think the current rate will fade. This one is wide enough to suggest the market treats the spike as temporary, but the data cannot say whether that is because of energy prices, because of the Federal Reserve's policy, or both. The 27 to 28 October meeting of the Federal Open Market Committee is the next test; the decision is due on Wednesday 28 October. Quoted odds of a rate increase differ by source and date, from about 19 per cent for October on 13 October (Trading Economics) to a spike near 47 per cent that later eased to about 26 per cent (CoinDesk, as relayed by Eastern Herald), so we do not rely on any single figure.

The shorter and longer ends tell a consistent story. On 20 October, the 5-year breakeven was 2.39 per cent (nominal 4.94 less real 2.55) and the 30-year was 2.26 per cent (5.42 less 3.16). The 5-year was 2.36 per cent on 1 October and the 30-year 2.30. The 5-year gained 3 basis points in the window while the 30-year lost 4; the 30-year nominal yield fell 19 basis points over the month (5.61 to 5.42) and its real yield 15 (3.31 to 3.16). The market, on this evidence, expects slightly more inflation in the nearer years than in the distant ones, and by a small margin.

Why it matters for mortgages and stocks

If the 10-year yield is mostly a real-yield story, then what borrowers and equity investors face is not primarily an inflation scare. The 10-year Treasury yield is a widely used benchmark for long-term borrowing costs, including mortgages. A higher real yield raises the return available without taking inflation risk, and it also raises the discount rate applied to company profits expected far in the future, which weighs most on long-duration assets such as growth stocks. These are standard relationships, not findings of this analysis. What the Treasury tables add is that, in October, the pressure on those prices came through real yields and was not accompanied by a rise in breakevens.

What breakevens cannot tell you

A breakeven is not a pure measure of expected inflation, and the counter-argument is a serious one. It combines expected inflation with a premium investors may demand for the risk that inflation surprises, and subtracts a premium for the lower liquidity of TIPS compared with ordinary Treasuries. A flat breakeven can therefore hide two offsetting changes, such as expectations rising while liquidity worsens. Readers who think the inflation-risk premium is rising would say a steady breakeven is understating the danger. TIPS payouts also follow the consumer price index with a lag and are affected by seasonal patterns, and an energy-driven spike in the headline CPI can flatter or depress the near-term break-even in ways that fade. Our subtraction also uses par yields from two separately constructed curves, so the third decimal of any breakeven here should not be over-read.

What the evidence does not establish

• The cause of the real-yield moves: the tables show what moved, not why, and the sources we read offer competing explanations.
• Longer-run inflation expectations: breakevens include risk and liquidity premiums that cannot be separated with public data.
• Anything after 20 October: Treasury's October tables ended there at the time of writing.
• Rate-hike probabilities: sources give conflicting figures at different dates, and we do not endorse one.

The practical conclusion is a modest one. If you are asking whether a 5 per cent 10-year yield means the bond market expects inflation to stay high, the Treasury tables for October say it does not, at least not by the measure these two curves allow. If you want to know whether that holds, watch the breakeven on the days around the 28 October decision, and watch whether the real yield keeps doing the moving.