Four London boroughs to cover half of Labour’s £430m mansion tax bill

By the Editorial Team · Friday, August 7, 2026

The UK Government plans to introduce a mansion tax in April 2028, targeting properties over £2 million with an annual surcharge expected to raise £430 million, more than half of which will come from just four London boroughs. Local leaders warn this will disproportionately affect long-term residents and pensioners, potentially disrupting established communities as the funds are used to support less affluent areas.

Homeowners in just four London boroughs are projected to shoulder more than half of the expected revenue from the UK Government’s proposed mansion tax, according to recent analysis. Under the planned high-value council tax surcharge, properties valued above £2 million will face an annual tax between £2,500 and £7,500 starting in April 2028. This measure is anticipated to raise approximately £430 million annually, with £275 million—about 55 percent—coming from residents of Richmond-upon-Thames, Kensington and Chelsea, Westminster, and Wandsworth.

Council leaders from these boroughs have formally expressed concern, arguing that the tax disproportionately burdens London homeowners, describing them as “cash cows” whose contributions would subsidize funding gaps elsewhere in the country. They warn the surcharge would affect long-established residents, including pensioners and families, who have seen their property values increase sharply without corresponding rises in income.

In a letter to Chancellor John Healey, the borough leaders urged the Government to pause and reconsider the rollout of the mansion tax. They emphasized the social and personal value of homes, stating that “a home is the centre of family life, not an untapped tax stream,” and highlighted that many affected individuals have built communities over decades despite flat or declining incomes.

The Government defends the policy as an attempt to address inequities in the council tax system, pointing out that high-value properties in London currently pay disproportionately lower tax relative to lower-valued homes elsewhere in the country. A Government spokesperson noted the surcharge aims to correct the anomaly where a Band D property in areas such as Darlington or Blackpool may pay more in council tax than a London mansion valued at £10 million in Mayfair.

Concerns have also been raised about potential further expansion of the tax base. Rumors suggest the Prime Minister, Andy Burnham, is considering lowering the mansion tax threshold from £2 million to £1.5 million, a move that could bring an additional 137,000 properties across England into the scope of the tax. This adjustment would increase the total number of liable homes to over 271,000, according to analysis by estate agency Hamptons.

Local council leaders reject the notion that the tax targets only the very wealthy. Elizabeth Campbell, leader of Kensington and Chelsea council, remarked that the surcharge will impact many residents who have lived in their homes for years, experiencing rising property values without increased earnings. Gareth Roberts, leader of Richmond council, criticized the approach, asserting it treats his borough’s residents as a financial resource to be exploited to compensate for fiscal shortfalls elsewhere.

Industry representatives have echoed these sentiments. Becky Fatemi of UK Sotheby’s International Realty cautioned that “London shouldn’t be treated as a cash machine,” warning that harming the capital’s financial ecosystem could have wider repercussions across the nation. Revenues from the surcharge will be collected by the Treasury, with expectations that funds will be redistributed to more deprived regions to help balance inequalities in public funding.

This article was reported by synthesizing coverage from multiple independent news outlets to present a balanced, unbiased account. Read about our editorial standards. Spotted an error? Let us know.