A Labour member of Parliament has expressed concerns over the party’s reported plans to lower the mansion tax threshold from £2 million to £1.5 million, cautioning that such a move could disproportionately impact family homes. Rachel Blake, MP for Cities of London and Westminster and former Treasury minister, raised the warning amid discussions that the tax change would double the number of affected properties.

The mansion tax, introduced last year by former Chancellor Rachel Reeves, is set to add a council tax surcharge on homes valued at £2 million or more starting in April 2028. However, reports indicate that John Healey, Reeves’s successor, is considering reducing the threshold to £1.5 million. Analysis from estate agents Hamptons suggests this adjustment would increase the number of liable homes to approximately 272,000, affecting about one in four detached homes in London.

Speaking on BBC’s Politics Live, Blake highlighted her apprehension about the proposed reduction, emphasizing potential unintended consequences. She pointed out that there is a significant distinction between ultra-high-value properties—such as those worth £30 million or £40 million—and smaller family homes whose values have appreciated greatly over several decades. Blake also criticized leaks about the possible threshold change, warning that such speculation might influence homeowner decisions detrimentally and distract from broader national interests.

In contrast, Shadow Housing Minister David Simmonds framed the potential cut as an overreach, stating it would effectively bring suburban semi-detached houses and bungalows within the tax’s scope. He suggested that many families could suddenly find their homes classified as mansions and face substantial new tax liabilities.

The Labour Party has yet to confirm officially whether the mansion tax threshold will be lowered, but ongoing debate underscores the challenge of balancing revenue generation with housing market sensitivities and the tax burden on middle-income homeowners.