Real rates, not inflation, drive US yields higher and lift the dollar

The noise is inflation fear, the signal is the real rate

Since early September the US bond market's story has been told as 'inflation is back'. The data do not support it. According to FRED, the 10-year Treasury yield was 4.79% on 1 September and 5.22% on 8 October, peaking at 5.31% on 5 October. Over the same period the 10-year breakeven inflation rate, the market expectation derived from the gap between nominal and inflation-linked bonds, was 2.35% on both dates. It slipped to 2.33% on 9 October.

The whole increase came from the real yield. The yield on the 10-year inflation-linked Treasury rose from 2.44% on 1 September to 2.87% on 8 October, touching 2.95% on 5 October. Investors, in other words, are demanding more not to protect themselves from inflation but for the real cost of tying up money in US Treasuries. The New York Fed's ACM model estimate of the 10-year term premium also rose, from 0.90% on 1 September to 1.08% on 2 October.

Why the constraint binds now

The real yield has two sources, and both tightened within the same month. The first is policy. The Fed raised rates to a 3.75–4.00% range in September, and August PCE inflation, at 3.4%, is 1.4 points above target. The 2-year yield rose from 4.39% on 1 September to 4.75% on 8 October; markets are pricing at least one more hike by year-end.

The second is supply. The CBO says the fiscal 2026 deficit rose to $1.993 trillion, or 6.2% of GDP, and net interest costs increased by $115 billion. The Treasury is financing that deficit at 10- and 30-year auctions with yields of 5.30% and 5.618%. The buyer base leans on foreigners, and the indirect bidder share fell from 80.3% at the 10-year to 72.3% at the 30-year. The cost of absorbing supply is paid in price, that is, in the real yield. The constraint is not inflation expectations but the match between America's borrowing needs and the real return foreigners demand.

The dollar exports the gap

When real rates rise, capital chooses the dollar. FRED's broad nominal dollar index stood at 118.57 on 31 August and rose to 121.79 on 1 October. EUR/USD hit a 17-month low of 1.1161 this week and was around 1.1226 on 9 October. The ECB's 2.50% deposit rate sits 1.3 points below inflation of 3.8%; most economists expect a December hike, but the gap is not closing.

The same mechanism works harder in emerging markets. The Reserve Bank of India raised rates on 7 October for the first time in nearly four years, and the rupee fell to 96.88 a day later. The CBRT's net reserves excluding swaps fell to $37.9 billion in the week of 2 October. The US real yield acts as a floor that other central banks must pay regardless of their own conditions.

The gap between households and markets

The regime's breaking point lies in expectations. In the Michigan survey, households' 5–10 year inflation expectations rose from 3.4% to 3.5% in October, and one-year expectations reached 4.7%. The market's breakeven rate is 2.33%. This 1.2-point gap shows that bond investors trust the Fed while households do not.

If the gap closes in the market's favour, today's regime persists: real yields stay high and the dollar stays strong. If it closes in households' favour and breakeven rises above 2.5%, the source of rising yields shifts from real rates to an inflation premium. The dollar could then lose value along with America's debt burden, breaking today's pairing of high yields and a strong dollar. That is why the first series to watch is not the nominal yield but the breakeven rate.

What it means for Türkiye

Türkiye feels this regime through two channels. The first is reserves: while the broad dollar index rose 2.7%, the CBRT's net reserves excluding swaps fell to $37.9 billion. The second is room on rates: with the US 10-year real yield at 2.87%, the real-rate premium needed to sustain carry demand for lira assets is rising. Unless the real yield drops back below its mid-September level of 2.62%, the CBRT cannot take a rate-cut decision independently of the exchange rate.