UK mortgage market reshaped by property taxes and rate volatility, DBRS says
- Once the principle that occupants of expensive properties ought to contribute more levy is established, lowering the limit to GBP 2.0 million, GBP 1.5 million or GBP 1.0...
- With the same income, you now get a smaller mortgage and need a higher deposit.
- More on this story: Housing Market Supports Gone as Borrowing Costs Rise
Property taxes and interest rate volatility are reshaping the UK mortgage market as lenders reprice fixed-rate products and buyers face tighter affordability constraints, dbrs.morningstar.com reported. Three successive Budgets between Spring 2024 and Autumn 2025 added material property taxes, including the abolition of the furnished holiday lettings tax regime, higher stamp duty surcharges on additional homes, and increased tax rates on rental income starting in April 2027.
Mansion Tax Takes Effect in April 2028
A new High Value Council Tax Surcharge, commonly called the mansion tax, takes effect in April 2028 as an annual charge on England homes valued at GBP 2.0 million or more. Ketan Thaker, Managing Director of European Real Estate and NPL Ratings at Morningstar DBRS, spoke at the DealCatalyst UK Mortgage Finance Conference 2026 in London and noted that the announcement opens the door to further housing taxation.
The tough part is over. Once the principle that occupants of expensive properties ought to contribute more levy is established, lowering the limit to GBP 2.0 million, GBP 1.5 million or GBP 1.0 million simply becomes an exercise in political persuasion.
Ketan Thaker
Recent news reports indicate the government is considering lowering that threshold to GBP 1.5 million, though no formal decision has been announced. These cumulative fiscal measures hit the London housing market particularly hard due to existing affordability pressures and heavy regulatory reforms in the buy-to-let sector.
Swap Rate Volatility Forces Lenders to Retool Hedging
Aside from legislative burdens, the mortgage market contends with persistent interest rate uncertainty driven by swap rate movements rather than the direct Bank of England rate. Between December 2021 and August 2023, the Bank Rate climbed from 0.10% to 5.25%, leaving some lenders exposed when their fixed-rate pipelines were not fully hedged. By 25 September 2026, markets priced in roughly an 80% chance of a rate rise by November 2026 following a 35-basis-point move in swap rates over a three-week period. Lenders now reprice rapidly and pay closer attention to hedging strategies to avoid legacy funding mismatches.
For prospective buyers, this dynamic restricts borrowing capacity under the same income levels, requiring larger deposits and creating hesitation.
With the same income, you now get a smaller mortgage and need a higher deposit. Purchasers face considerable doubt as they weigh whether to proceed immediately or hold off. Overall, buyers are more hesitant.
Ketan Thaker
Remortgage Growth Versus Stagnant New Purchase Lending
Despite affordability hurdles and narrowing rate spreads between two- and five-year fixed products, overall lending volumes remain stable. UK Finance maintained its September 2026 mid-year forecast projecting a 4% increase in gross mortgage lending for 2026, reaching GBP 300 billion, with growth powered primarily by remortgaging rather than new home purchases. Arrears stay very low at present, though Thaker cautioned that refinancing shocks could push arrears upward by mid-2027.
Market participants await official confirmation on whether the government will lower the mansion tax threshold to GBP 1.5 million and how upcoming refinancing cycles will impact borrower arrears by mid-2027.