A mansion tax is a common name for an annual property tax on high value homes, although the term itself is widely regarded as a misnomer.
Until the Budget of Autumn 2025, the tax was only a proposal in the United Kingdom, but will now come into effect in April 2028 on properties worth over ã2 million.
Many US states levy a surcharge on the highest-value homes or have a progressive taxation in their real estate transfer tax system, sometimes referred to as âÂÂmansion taxes.âÂÂ
In the United Kingdom, the concept of a mansion tax is widely attributed to Vince Cable. In its original form, proposed in 2009, Cable suggested that all properties valued at over ã1 million would be taxed annually. He raised the proposed threshold to ã2 million in January 2012.
In an accommodation with Coalition partners, the proposal was modified and a 7% rate of Stamp Duty Land Tax was levied on house sales over ã2 million, following George Osborne's 2012 budget. In contrast to an annual "mansion tax", this one-off tax is only paid when a property is bought.
Support for the original proposal re-emerged at the Liberal Democrat 2012 conference.
The motion called for "an annual mansion tax on the excess value of residential properties over ã2 million as a first step towards wealth taxation designed to reduce inequality". It was passed in a vote of over 200 delegates, with two against.
Despite this, the Liberal Democrat's coalition government partner, the Conservatives, ruled out the introduction of a Mansion Tax; Chancellor of the Exchequer George Osborne said in October 2012: "We are not going to have a mansion tax, or a new tax that is a percentage value of peopleâÂÂs properties. Before the election they will call it a mansion tax, but people will wake up the day after the election and discover suddenly their more modest home has been labelled a mansion."
On 14 February 2013, the Labour Party leader Ed Miliband said that he would, if in government, introduce a mansion tax and then re-introduce a ten pence tax rate for low earners. However, there was no commitment to put this policy into the Labour Party manifesto and there was also criticism of the fairness and practicality of the proposal. Miliband reiterated this policy proposal at the 2014 Labour Party Conference and it became a firm commitment. Labour claimed the policy would raise ã1.2 billion a year which would be used to fund the National Health Service. Based on an estimated 100,000 homes valued over ã2 million, this means each property would be liable for an average bill of ã12,000.
On 20 October 2014 in response to widespread publicity about the proposal, the Shadow chancellor Ed Balls published further details. He confirmed properties valued between ã2 million and ã3 million would pay ã3,000 per annum, but properties over ã3 million would pay considerably more. Commentators have suggested that in order to raise the projected ã1.2 billion, the mansion tax payable on homes over ã3 million would have to be ã28,000.
After Labour's May 2015 election defeat, Labour leadership candidates began to distance themselves from the policy. Andy Burnham said the mansion tax had been too "symbolic" and played into a public dislike of the "politics of envy". Mary Creagh, another candidate for the leadership, said: "It alienated a whole bunch of people who said we were against them getting on and doing well".
In October 2014, the Liberal Democrats abandoned plans for a new tax on high-value homes, opting instead for a change in the existing Council Tax system. Nick Clegg, speaking on the BBC during the Liberal Democrat Party Conference 2014, said: "I went off, big time, the idea that you have a fixed levy as a percentage over a certain value. The more I looked at it, the more I thought, 'ThatâÂÂs very crude.' It leads to eye-watering amounts of tax being paid. What we should do is go with the grain of the council tax system and apply bands to higher properties."
On 3 December 2014 George Osborne announced changes to stamp duty. These measures included large increases in tax for more expensive houses. A buyer of a house at ã2 million would now have to pay ã153,750 in stamp duty. In his speech he alluded to this being his alternative to Labour's mansion tax.
Rachel Reeves announced the High Value Council Tax Surcharge, a new charge on owners, rather than occupiers, of residential property in England. The following annual charges would apply from April 2028:
Properties valued from ã2m to ã2.5m will pay ã2,500
Properties valued from ã2.5m to ã3.5m will pay ã3,500
Properties valued from ã3.5m to ã5m will pay ã5,000
Properties valued at more than ã5m will pay ã7,500
Critics have said such a policy would hurt pensioners, as according to analysis by the think-tank the Centre for Policy Studies, almost one third of all properties worth over ã2 million have been in the same ownership for over ten years.
The phrase "mansion tax" has been described as a misnomer as 10% of properties in London valued at ã2m-plus are one- or two-bedroom flats.
Los Angeles has a 4% tax on property sales above $5 million and 5.5% on sales above $10 million. As of January 2026, the tax has raised over $1 billion.