UK Mortgage Rates Climb as Gilt Yields Hit 28-Year High Ahead of Budget

UK mortgage rates are on the rise again in October 2026, driven by a surge in gilt yields to levels not seen in decades. The 30-year gilt yield briefly hit 6.029% on 1 October, its highest since early 1998, while the 10-year yield climbed to around 5.5%, the highest since July 2007. This increase in borrowing costs is directly impacting mortgage pricing, as lenders like HSBC, Halifax, and BM Mortgages have already adjusted their fixed-rate deals in response to higher funding costs.

The rise in mortgage rates is particularly challenging for homeowners coming off fixed-rate deals this autumn. The Bank of England notes that two-year fixed mortgage rates are about 95 basis points higher than before the energy conflict in the Middle East began. This increase can significantly add to monthly payments, especially for households with large loans relative to income, such as first-time buyers in the South East.

Several factors are driving the gilt sell-off, including elevated oil prices, uncertainty around monetary policy, heavy gilt issuance, and global market trends. Kathleen Brooks, research director at XTB, highlights that sovereign yields have been moving in lockstep with oil prices. The Debt Management Office's financing remit for 2026-27 includes a £257.1 billion net financing requirement, raising concerns about the trajectory of public finances.

The upcoming Budget on 28 October 2026 is crucial, as any reliance on substantial gilt issuance in 2027 could put further pressure on gilt yields and mortgage rates. Goldman Sachs has lifted its end-2026 forecast for the 10-year gilt yield to 5% from 4.4%, warning that markets want evidence of borrowing being brought under control. Comparisons to the 2022 mini-budget crisis are inevitable, but the current situation is more gradual and tied to global factors.

For homeowners, the advice is to explore mortgage options early rather than wait for the Budget. Securing a mortgage offer now provides a cost ceiling, and borrowers can often switch to a better product if pricing improves before the new deal starts. For savers, higher gilt yields generally lead to better rates on fixed-term savings products and improved annuity rates for retirees.

The gilt market now sets the tone for mortgage costs, government fiscal room, and the valuation of rate-sensitive stocks. Until there is clearer evidence on Middle East energy supply, UK inflation, and the fiscal plans in the Budget, volatility in gilts and mortgage pricing is likely to remain elevated.