UK Long-Term Borrowing Costs Reach Highest Level Since 1998

Yields on UK government bonds, known as gilts, climbed sharply on Tuesday, with the 30-year gilt yield reaching 5.79%, its highest level since May 1998. This surge came amid reports of a plot by lawmakers to oust Prime Minister Keir Starmer, just days before local elections expected to deliver significant losses for the ruling Labour Party.

Shorter-term 10-year gilt yields also rose to 5.122%, though below recent peaks. The bond market reaction reflected investor concerns about political instability, with votes on Thursday projected to shift toward parties like Reform UK and the Green Party, potentially costing Labour up to 2,000 council seats.

Multiple sources linked the yield increases to fears that election fallout could weaken fiscal discipline, prompting demands for Starmer's resignation or a departure timeline from backbench MPs.

Investors now anticipate at least two interest rate hikes from the Bank of England in coming months, despite the central bank holding rates at 3.75% last week. Inflation expectations over the next 10 years climbed to 2.5%, the highest since 2023, based on breakeven rates.

A chief investment strategist at Wealth Club highlighted the role of energy prices and the Middle East situation in pushing yields higher, noting unease ahead of the elections where Labour is expected to face setbacks. The strategist added that higher borrowing costs shrink the Treasury's room for maneuver, with more revenue absorbed by debt interest payments at a time of calls for support to households and businesses.

“UK gilt yields have edged even higher as painful energy prices and the tense Middle East situation mean multiple interest rate hikes look likely.”

Sterling remained steady at 1.353 against the dollar amid the turmoil. The yield increases, which move inversely to bond prices, mean the government must offer higher returns to attract buyers, directly translating to elevated debt servicing costs.

The rise presents challenges for Chancellor Rachel Reeves, who faces pressure over mounting debt and a constrained fiscal position. Reeves has indicated that any financial support for households affected by the Iran crisis would be targeted rather than universal.

A Downing Street spokesperson confirmed that the Chancellor briefed ministers on the fiscal outlook. Mortgage borrowers are particularly exposed, as fixed-rate deals track gilt movements, leading some lenders to pull cheaper offers. Housebuilder shares declined in early trading, reflecting potential impacts on property demand, while elevated costs could delay business investments and force choices between higher taxes or tighter spending.

The UK already has the highest government borrowing costs among G7 nations, with 10-, 20-, and 30-year yields above 5%. Memories of the 2022 mini-budget crisis, which sparked a gilt market meltdown under a previous administration, remain fresh, heightening sensitivity to any perceived shift toward looser fiscal policy.

Starmer has faced internal discontent over fiscal policies, welfare reforms, and appointments, including naming Peter Mandelson as ambassador to the United States. Potential successors mentioned include Health Minister Wes Streeting, former Deputy Prime Minister Angela Rayner, and Greater Manchester Mayor Andy Burnham, though Burnham currently lacks a parliamentary seat.

The local elections involve electing over 4,800 council representatives, with results seen as a test of Starmer's leadership. Investors worry that signs of instability could lead to less disciplined spending, further pressuring yields, especially at the longer end where supply risks are higher.

“There's also unease ahead of the local elections, with Labour expected to take a drubbing in the polls.”

Political uncertainty has negatively affected gilt performance, compounding macroeconomic pressures like weak growth and elevated borrowing.