25th September 2026
The US bond market is sending an important signal about the future direction of interest rates.
The yield on the 10-year US Treasury bond climbed to around 5.14% on Thursday, its highest level since 2007, while the 30-year Treasury yield reached about 5.44%, its highest level since 2004.
It is worth remembering that bond prices and yields move in opposite directions. When investors demand a higher return for holding government debt, bond prices fall and yields rise.
The move is particularly interesting because the Federal Reserve has only recently raised its short-term interest rate to 3.75%-4%. It is therefore not simply a case of the central bank pushing up borrowing costs. Investors themselves are demanding higher returns on longer-term US government debt.
There are several reasons.
US economic activity remains stronger than expected, while inflation is proving difficult to bring down. Higher energy prices are adding to the problem, and stronger business activity has led financial markets to reassess how quickly interest rates can come down.
The Federal Reserve's September decision also matters. The central bank raised rates by a quarter of a percentage point and its latest projections indicate that policymakers are still concerned about inflation.
Markets are consequently no longer assuming that interest rates will simply fall steadily from here.
That does not mean that rates must continue rising. If inflation eases, energy prices fall or economic activity weakens substantially, the situation could change. Bond yields can also move quickly when investors change their expectations.
But the current market message is clear enough: the return to very cheap money may be further away than previously expected.
This matters beyond the United States. US Treasury yields influence borrowing costs internationally because American government bonds are one of the world's major financial benchmarks. Higher US yields can therefore contribute to higher borrowing costs elsewhere, although each country's interest rates ultimately depend on its own economic circumstances.
For Britain, this is another reason to watch what happens to inflation and government borrowing costs. The Bank of England has its own decisions to make, but it cannot completely ignore what is happening in global bond markets.
The big question now is whether the recent rise in US bond yields is a temporary reaction to inflation and energy prices, or the beginning of a longer period in which investors expect higher interest rates and higher returns on government debt.
For households, businesses and governments carrying significant amounts of debt, that distinction could become increasingly important.
US bond market sends a warning to UK mortgage borrowers
If your fixed mortgage is coming to an end, don't simply assume that interest rates will be lower by the time you need to refinance. Start looking at your options early and keep an eye on the rates available to you.