Speculation is mounting that Andy Burnham, a potential contender for the Labour leadership, could significantly expand the reach of the High Value Council Tax Surcharge, commonly dubbed the ‘mansion tax’. Under rumoured plans, the threshold at which properties become subject to the levy could be lowered from £2 million to £1.5 million, drawing an estimated 150,000 additional households into its scope.
The ‘mansion tax’, initially announced by Chancellor Rachel Reeves in the 2025 Autumn Budget, is slated to come into force in April 2028. As it stands, homes valued at £2 million or more will face an annual surcharge ranging from £2,500 to £7,500, depending on their precise value. For instance, properties between £2 million and £2.5 million would incur a £2,500 charge, escalating to £7,500 for homes valued at £5 million or more. These charges are intended to increase annually in line with the Consumer Price Index (CPI).
Should Mr Burnham secure the Labour leadership, a primary motivation behind lowering the threshold would be to address pressing financial commitments. Reports suggest he would need to find new revenue streams to fund an expanding welfare budget and a multi-billion pound shortfall in the Defence Investment Plan (DIP). Lowering the mansion tax entry point is seen as one potential mechanism, alongside other rumoured policies such as a review of the triple lock pension system.
Analysis from the think tank Tax Policy Associates indicates that reducing the threshold to £1.5 million could nearly double the number of households affected. Their calculations suggest approximately 243,000 households would become liable for the surcharge, a substantial increase from the 127,000 anticipated under the current £2 million threshold. The Valuation Office (VO), part of HMRC, is tasked with assessing property values for the surcharge, with revaluations expected every five years.
For UK households and the property market, a reduced threshold could have considerable implications. While the current policy targets the very highest end of the market, a £1.5 million entry point would encompass a broader segment, particularly in affluent areas of London and the South East. This move could increase the tax burden on a significant number of homeowners, potentially influencing property transactions and valuations in the coming years. The Bank of England's current focus on inflation and interest rates adds another layer of complexity, as any additional property taxes could impact disposable income and consumer confidence.