US 10-year Treasury yield nears 5% after CPI as real yields drive bond selloff

The US 10-year Treasury yield came within two basis points of 5% during Thursday's global bond selloff, then fell toward 4.92% on Friday as oil declined and markets digested the August inflation report. The 30-year yield retreated toward 5.32% after reaching about 5.37%, its highest level since 2007. The reversal reduced the immediate pressure but left long-duration borrowing costs materially above the level of a week earlier.

August consumer prices rose 3.4% from a year earlier. More important for the front end, futures pricing after the release put the probability of a 25-basis-point Federal Reserve increase at the September 15-16 meeting at about 80%, according to the Financial Times. A September increase is therefore the market's base case, although the decision remains uncertain.

The long end is pricing a different mix of risks. The 10-year Treasury yield was about 4.77% on September 4 and about 4.95% on September 10, a rise of roughly 18 basis points on a comparable daily basis. Over the same dates, the 10-year breakeven inflation rate increased from 2.35% to 2.40%. Using the standard calculation of nominal yield minus breakeven inflation, the implied 10-year real yield rose from roughly 2.42% to 2.55%, or about 13 basis points, while inflation compensation supplied only about 5 basis points of the nominal move.

The long-end selloff was mostly a real-rate repricing

That decomposition does not measure the term premium directly. It does reject the simplest explanation that investors pushed the 10-year toward 5% mainly because long-run inflation expectations jumped. Most of the September 4-10 move came through the real component, which can reflect expected policy rates, growth, duration supply-demand and term compensation.

Thursday's market supplied evidence for the supply side of that story. A weak 30-year auction and a Treasury buyback operation that fell short of the amount investors had hoped would be absorbed added pressure at the long end while oil was simultaneously lifting inflation risk. The combination matters more than assigning the entire residual to a single label such as "fiscal risk."

The financing consequence is immediate. With a 5% Treasury benchmark, an investment-grade issuer borrowing at a 100-basis-point spread starts near a 6% nominal coupon before fees; a riskier company at a 300-basis-point spread starts near 8%. Refinancing debt issued in the low-rate years becomes an earnings event even if operating profit is unchanged.

Equity valuation feels the same pressure through the discount rate. The damage is concentrated in businesses with distant cash flows, weak current free cash flow or high debt loads that force refinancing into the new rate structure. A Treasury yield near 5% also gives institutional capital a materially higher risk-free alternative without mechanically implying any fixed amount of equity downside.

The 5% threshold should not be fetishized. There is no historical rule that a 5% 10-year produces a 10% stock-market correction. The more informative result is that the latest long-end repricing was predominantly real rather than breakeven-driven. Friday's rally shows part of that move can reverse when energy pressure eases; persistence above the old range would require investors to keep demanding unusually high real and duration compensation after the near-term inflation shock stops doing the work.

Sources

• Financial Times, September 11, 2026: https://www.ft.com/content/2c9ce5b0-32ae-4460-aa89-9c80eb05ee41
• Associated Press market coverage: https://apnews.com/article/8c3272812f5e9b9238c6a3301921c17a
• US Treasury daily interest-rate data: https://home.treasury.gov/resource-center/data-chart-center/interest-rates
• Federal Reserve Bank of St. Louis, 10-year breakeven inflation: https://fred.stlouisfed.org/series/T10YIE
• Federal Reserve Bank of St. Louis, 10-year inflation-indexed Treasury yield: https://fred.stlouisfed.org/series/DFII10