The mansion tax in the UK, officially the High Value Council Tax Surcharge, is currently set to apply to homes in England worth £2 million or more from April 2028. But there is growing speculation that the Autumn Budget 2026, set to be delivered on 28 October, could lower that threshold to £1.5 million.
That is not confirmed. However, an analysis by the think tank Tax Policy Associates estimates that lowering the threshold to £1.5 million could bring around 160,000 additional homes into scope, taking the total number of affected homes from roughly 123,000 to 283,000.
This article covers what is fixed with regard to the threshold reduction and what are just rumours. It also discusses what property owners should do now.
Key Takeaways
- The UK mansion tax, officially known as the High Value Council Tax Surcharge, is confirmed for homes in England worth £2 million or more from April 2028
- Speculation ahead of the Autumn Budget 2026 suggests that the threshold could be reduced to £1.5 million, but this is not government policy so far
- Tax Policy Associates estimates that a £1.5 million threshold would bring around 160,000 additional homes into scope
- Owners of homes subject to the surcharge will pay between £2,500 and £7,500 a year, depending on the property’s value
- Tax Policy Associates estimates that around 85% of the additional homes that could be brought into the surcharge if the threshold falls to £1.5 million are located in London and the South East
What is the UK Mansion Tax?
The UK mansion tax, officially known as the High Value Council Tax Surcharge (HVCTS), is an annual charge on high-value residential properties in England. It was announced at the 2025 Budget and will apply from April 2028 to properties valued at £2 million or more. According to the government’s consultation, which ran from 19 May to 14 July 2026, the Valuation Office Agency will assess property values for this surcharge. Properties will then be revalued every five years.
Furthermore, HVCTS will be charged in addition to normal Council Tax. Local councils will collect the mansion tax and pass the revenue to central government.
How Much is the Mansion Tax?
The mansion tax will range from £2,500 to £7,500 a year, depending on the value of the property. Under the presently confirmed £2 million model, the tax will be charged on the basis of the following bands.
Property Value | Annual Surcharge |
|---|---|
£2 million to £2.5 million | £2,500 |
£2.5 million to £3.5 million | £3,500 |
£3.5 million to £5 million | £5,000 |
£5 million and above | £7,500 |
These charges are currently set out in the Government’s plans but have not yet been legislated, so they should not be described as final law. The charges are also set to rise with inflation from 2029/30. Meanwhile, the Government expects the mansion tax to raise around £430 million a year.
Could the Autumn Budget 2026 Lower the Threshold to £1.5 Million?
Yes, the Autumn Budget 2026 could lower the mansion tax threshold from £2 million to £1.5 million, but the Government has not confirmed that it will do so. Reuters reported on 18 September that the Government was considering the change, citing two government sources familiar with the matter. But press reports do not necessarily indicate final government positions.
Because the HVCTS is a council tax measure, lowering the threshold (and thereby bringing more people into scope) would not breach the government’s promise to hold the rates of Income Tax, National Insurance and VAT. This further makes the threshold reduction a politically convenient lever.
As with most Budget measures, treat the rumour as a planning scenario, not a decision.
Who Would Be Affected If the Threshold Drops to £1.5 Million?
A lower £1.5 million threshold would bring high-value homes currently worth between £1.5 million and £2 million into the mansion tax net. Tax Policy Associates estimates that this would add around 160,000 homes to the HVCTS. Around 85% of these additional homes are estimated to be in London and the South East, with Surrey identified as the area with the largest number of newly affected properties.
The impact would, therefore, naturally extend beyond owners of properties already worth more than £2 million. A property owner whose home is valued at £1.6 million, for example, would currently sit below the proposed £2 million threshold and would not face the surcharge. If the threshold were reduced to £1.5 million, however, that same property would come within the tax’s scope.
Worked Example: What Would a £1.6 Million Home Cost Its Owner in Mansion Tax?
Consider a property owner in Surrey with a family home valued at £1.6 million. Under the current plan, the property would be below the £2 million threshold, so there would be no HVCTS surcharge. If the threshold were reduced to £1.5 million, the property would fall into the £1.5 million to £2 million range and, under the structure modelled by Tax Policy Associates, would face a £2,500 annual surcharge.
Scenario | Mansion Tax |
|---|---|
Current £2 Million Threshold | £0 |
Rumoured £1.5 Million Threshold | £2,500 |
That would mean an additional £2,500 a year, or £25,000 over 10 years if the charge remained unchanged, on top of the property's normal Council Tax.
Conclusion: What Should High-Value Property Owners Do Before the Autumn Budget?
If your property is worth somewhere between £1.5 million and £2 million, the most useful thing you can do before the Autumn Budget is establish where you stand. Get a credible current valuation and check how the potential £1.5 million threshold would affect your annual property costs if it were introduced.
For now, the £2 million threshold is the only confirmed position. So, treat the £1.5 million threshold as a scenario worth preparing for, but not as a tax that has been introduced.
Use This Planning Time Wisely
Talk to experts who have been watching and working in the UK property sector for decades and understand how best to proceed.
FAQs
The UK mansion tax will work by applying an annual surcharge to residential properties in England that meet the relevant value threshold. Under the current plans, the Valuation Office Agency will assess properties at their April 2026 values, and properties worth £2 million or more will be placed into one of four surcharge bands. The owner will then pay an annual charge of between £2,500 and £7,500 in addition to normal Council Tax.
There is no legal definition of a “mansion” for UK tax purposes, so a property does not need to meet any particular standard to be treated as one. For the purposes of the High Value Council Tax Surcharge, the relevant test is its value. Under the current plans, a residential property in England worth £2 million or more at April 2026 values will fall within the surcharge from April 2028.
Not yet. The current threshold is £2 million, but press reports say the Government is considering lowering it to £1.5 million ahead of the Autumn Budget.
The owner of the property pays the mansion tax, not the tenant or the occupier.
The mansion tax is currently scheduled to start in April 2028.
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