UK Homeowners Granted Six-Month Window to Appeal New £2 Million Mansion Tax

Homeowners facing the UK government’s new mansion tax will have approximately six-months to appeal against the decision before it comes into effect, it has emerged. The methodology for deciding valuations is due to be announced before the end of this year, with owners told by next autumn whether their homes are deemed to be above the £2 million mark at which the charge is introduced.

HM Revenue and Customs has built in a period to allow for appeals before the system goes live in spring 2028. Owners who dispute the valuation of their home will be given time to check and challenge the charge, which was introduced by former chancellor Rachel Reeves in last year’s budget.

Under the plans, owners are expected to pay £2,500 a year for properties worth £2 million to £2.5 million, and £3,500 for properties worth up to £3.5 million. Properties between £3.5 million and £5 million would incur a charge of £5,000 annually, while those worth more than £5 million would face a £7,500 levy. The surcharge, officially named the high value council tax surcharge, is separate from the council tax and would rise annually with inflation. It is expected to affect around 200,000 homes or 1 per cent of properties, mostly in London and the south-east of the country.

John-Paul Marks, the chief executive of HMRC, told the Treasury Committee this week that 300 extra staff would be needed within the Valuation Office to implement the tax. Committee chairman Meg Hillier noted there was concern regarding inspectors visiting homes. Mr Marks stated that valuations would be done using AI and publicly available data such as property sales and registry, with inspections used as a last resort.

James Cleverly, the Conservatives’ shadow housing secretary, criticized the measures, stating families faced tax inspectors checking properties to justify higher taxes. Meanwhile, the government defended the tax as a way to address long-standing unfairness in the property tax system.