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October budget pressure builds
Higher yields matter because they raise the rate at which the government may need to refinance maturing debt or issue new bonds, increasing projected interest costs used in official fiscal forecasts. Bond prices move in the opposite direction to yields, so investor selling pushes prices down and effective yields up. The Treasury does not refinance its entire debt stock at once — the effect passes through gradually as bonds mature.
Economists at Pantheon Macroeconomics estimated that higher borrowing costs could reduce the government's fiscal headroom from about £23.6 billion at the previous Spring Statement to approximately £13 billion. That is an external estimate rather than an official calculation. The government is due to present its budget on Oct. 28, and updated forecasts will determine whether ministers need to raise taxes, reduce planned spending or change other policies to meet fiscal rules. No emergency spending package has been announced, and the current government has not confirmed it will adopt the course Truss described — her forecast remains a forecast.
Truss's warning carries history
The political context is hard to ignore. Truss's government introduced approximately £45 billion of largely unfunded tax cuts in September 2022 without an accompanying Office for Budget Responsibility forecast. The announcement caused a rapid selloff in long-dated gilts and instability among pension funds using liability-driven investment strategies, forcing the Bank of England into temporary bond purchases. The 30-year gilt yield rose from about 3.38% when she became prime minister to almost 5% during the turmoil, most measures were reversed, and she resigned after 49 days. Current yields are higher than the peaks recorded during that episode — though the present move is part of a global repricing rather than a response to a single U.K. policy announcement.
A global bond selloff
Government borrowing costs have increased across the U.S., Japan, Germany and France. The benchmark 10-year U.S. Treasury yield reached approximately 4.81%, its highest level since November 2023, after briefly falling to about 4.62% following the Treasury's August bond buyback expansion. Rising oil prices have added to inflation concerns, with Brent crude briefly approaching $95 per barrel as fighting between the U.S. and Iran threatened energy supplies. Higher energy costs can keep consumer inflation elevated, limiting central banks' ability to cut rates — and expectations of higher-for-longer rates reduce demand for existing bonds carrying lower fixed payments.
Bitcoin holds its ground, for now
Bitcoin traded near $76,500 on Sept. 2, down about 2% over 24 hours, after climbing from approximately $64,000 to a high above $81,000 and losing momentum. It remained above its main daily moving averages following its August rally, and above levels recorded before the Treasury intervention. Gold followed a similar path, climbing toward $4,700 per ounce before retreating to approximately $4,300.
Bitcoin and gold are sometimes presented as protection against currency depreciation or excessive government borrowing, but their recent declines show the relationship is not consistent over short periods. Higher government bond yields make interest-paying assets more attractive relative to non-yielding assets and can reduce demand for riskier instruments by tightening financial conditions. Analysts have flagged weak spot flows behind Bitcoin's recovery, and rising yields give the skeptics another argument. The U.K.'s next confirmed milestone is the Oct. 28 budget — until then, macro pressure remains the dominant force over crypto prices.
