Southern England’s property owners have been handed a significant reprieve after Chancellor John Healey ruled out lowering the proposed mansion tax threshold from £2 million to £1.5 million ahead of the Autumn Budget on 28 October 2026.
The decision means thousands of homeowners across London, the South East and other expensive housing markets are expected to escape an additional annual property tax that could have cost between £2,500 and £7,500.
However, the wider debate over UK property tax increases is far from over. The government is still proceeding with its High Value Council Tax Surcharge, scheduled to begin in April 2028, while rising mortgage costs and uncertainty over future taxation continue to influence housing market activity.
New research from estate agency Yopa suggests that almost one in ten London properties currently advertised for sale would have crossed the proposed £1.5 million threshold. The South East would have been the next most exposed region.
For homeowners in expensive parts of Southern England, the immediate question is no longer whether the threshold will fall this month, but how the existing £2 million tax, property valuations and other ownership costs could affect future buying and selling decisions.
Almost One in Ten London Homes Could Have Faced Higher Property Taxes
The scale of the proposed tax expansion has become clearer following research published on 13 October by Yopa.
The estate agency examined 792,456 properties advertised for sale across England and found that 11,848 had asking prices of at least £2 million, representing approximately 1.5% of the available stock.
Reducing the threshold to £1.5 million would have increased that number to 22,092 properties, bringing another 10,244 advertised homes into the potential tax bracket.
That represents an 86% increase in the number of properties potentially affected, based on the agency’s listing analysis.
London would have experienced the largest concentration of exposure.
At the existing £2 million threshold, approximately 6,963 London properties on the market qualify by asking price. That represents 5.8% of homes currently advertised in the capital.
A £1.5 million threshold would have increased the number to 11,316 properties, equivalent to 9.4% of London listings.
The decision to retain the higher threshold has therefore prevented an estimated 4,353 additional London listings from falling within the potential tax bracket.
However, these figures relate to advertised asking prices, not official tax valuations, and they should not be interpreted as percentages of all homes in London.
Verona Frankish, Chief Executive of Yopa, highlighted the difficulty of distinguishing expensive family housing from luxury property in the capital.
“The concern has always been that £1.5million doesn’t necessarily buy you a mansion in London.”
Her comments reflect concerns among homeowners whose property values have risen substantially because of location rather than significant increases in household income.
In areas such as Richmond, Wimbledon, Hampstead and parts of Kensington and Chelsea, a property worth more than £1.5 million may be a long-held family residence rather than a recently acquired luxury investment.
For these households, an additional annual ownership tax could create financial pressure despite considerable property wealth.
The implications extend beyond London.
Yopa’s analysis found that the South East had 5,025 homes advertised at £1.5 million or more, representing 3.4% of properties available for sale across the region.
The South West followed at 1.7%, with the East of England at 1.4%.
These findings reinforce the geographical imbalance at the centre of the property tax debate.
High-value homes are not distributed evenly across England, and the same property tax threshold can capture very different kinds of housing depending on the region.
A relatively ordinary detached family home in an expensive London commuter area may attract a similar surcharge to a substantially larger rural property elsewhere.
Knight Frank’s September analysis illustrated this disparity through differences in property space. Based on local average prices per square foot, £1.5 million would purchase considerably less space in Kensington and Chelsea than in more affordable areas of Northern England.
The regional contrast helps explain why lowering the threshold became politically controversial.
The £2 Million Mansion Tax Is Still Going Ahead
Despite the Chancellor’s decision to abandon the proposed lower threshold, the existing High Value Council Tax Surcharge remains government policy.
First announced in November 2025, the charge is scheduled to take effect in England from April 2028.
It will be paid by owners of qualifying residential properties, in addition to ordinary council tax.
The initial annual charges have been set out across four property-value bands.
| Property value | Annual surcharge |
| £2 million–£2.5 million | £2,500 |
| £2.5 million–£3.5 million | £3,500 |
| £3.5 million–£5 million | £5,000 |
| Above £5 million | £7,500 |
The government also plans to increase these charges annually in line with inflation from 2029–30.
For an owner whose property is valued at £2.2 million, the additional £2,500 represents approximately £208 per month before normal council tax.
Over five years, that would amount to £12,500 before inflation-related increases.
Owners of properties valued above £5 million face an initial annual surcharge of £7,500, equivalent to £625 per month.
The tax is not calculated as a percentage of the home’s entire value. Instead, the annual bill is determined by the valuation band.
Importantly, the new charge will involve a separate assessment of qualifying homes using 2026 property values. Existing council tax bands based on 1991 valuations will not determine whether a property is included.
The Valuation Office is expected to conduct targeted valuations, with future revaluations planned every five years.
Homeowners looking for further details on how property values will be assessed can review the existing explanation of the England high-value property tax, including the planned valuation and payment arrangements.
For households with substantial housing wealth but limited income, the government has also consulted on a deferral scheme.
This could allow eligible owners to postpone paying the surcharge until a change of property ownership, potentially including a sale.
The consultation proposed financial eligibility criteria involving household income of £35,000 or less and capital savings of £16,000 or less, together with certain disability-related circumstances.
However, those thresholds and the interest arrangements for deferred payments should not be treated as final until the government confirms the detailed rules.
Southern England’s Housing Market Was Already Under Pressure
The latest development comes at a difficult time for the residential property market.
Property tax speculation has added another layer of uncertainty to a market already affected by higher mortgage rates, affordability constraints and weaker buyer confidence.
Lloyds’ September housing index reported an average UK house price of £298,441, with annual price growth effectively at a standstill.
Meanwhile, Knight Frank reported on 9 October that values in its country-house market, covering properties above £750,000 outside London, had fallen by 4.2% over the year to September.
The agency also reported that the number of offers made in that market during the third quarter was 10% lower than a year earlier.
Higher borrowing costs are a particularly important factor.
Average five-year fixed mortgage rates reached approximately 6% in October, according to market data discussed by Knight Frank.
This makes purchasing an expensive property materially more difficult, particularly for buyers moving from smaller homes or relying on significant mortgage borrowing.
James Cleland, Head of Country Sales at Knight Frank, said that tax uncertainty and rising borrowing costs had left buyers and sellers struggling to find stable conditions.
The broader concern is that potential purchasers may postpone decisions until after the Budget, while sellers may become increasingly realistic about asking prices.
For example, a seller marketing a property at £2.05 million may encounter buyers concerned about the additional annual surcharge.
A reduction to £1.95 million could potentially change the property’s expected tax treatment, although an advertised or agreed sale price would not itself determine the official tax valuation.
Consequently, the £2 million boundary may become an additional consideration in price negotiations.
There is no evidence that every property near the threshold will experience a price reduction. Nevertheless, the annual ownership cost may influence buyer affordability calculations and the relative attractiveness of competing homes.
For buyers assessing a cautious housing market, understanding how much lower an offer can be than the asking price remains relevant, particularly where properties have remained unsold for several months.
The tax decision provides some certainty, but it does not resolve the wider affordability problems facing Southern England.
Buy-to-Let Landlords Face a Different Tax Reality
The government’s retreat from a broader mansion tax has also renewed attention on the tax treatment of landlords and property investors.
Reports ahead of the Budget suggest the Chancellor is reluctant to introduce some additional taxes on property wealth and investment gains.
However, landlords have not escaped all forthcoming tax increases.
Changes legislated under the Finance Act 2026 will introduce separate income tax rates for property income from 6 April 2027.
The rates are:
- 22% for property income falling within the basic-rate band.
- 42% for property income falling within the higher-rate band.
- 47% for property income falling within the additional-rate band.
These represent increases of two percentage points compared with the previous equivalent rates.
For illustration, a landlord with £20,000 of taxable rental profit falling entirely within the higher-rate band would face an additional £400 of income tax annually under the new rate, assuming all other relevant circumstances remain unchanged.
That example concerns taxable profits, not gross rental receipts, and the actual liability will depend on the landlord’s income and allowable deductions.
The changes principally affect individuals receiving taxable property income. Company-owned rental properties operate under different taxation rules.
Property investors must also distinguish these income tax changes from the proposed mansion tax.
A landlord holding a £2.5 million residential property in Southern England could potentially be affected by the High Value Council Tax Surcharge as an owner, while separately paying income tax on profits earned from letting it.
For landlords thinking about converting their main residence into a rental property, the existing rules concerning renting out a first home remain important when considering mortgage permissions, legal responsibilities and potential taxation.
Further uncertainty surrounds capital gains tax.
Reports on 13 October indicated that Chancellor Healey had ruled out aligning capital gains tax rates with income tax rates, although smaller changes had not been entirely excluded from Budget discussions.
For owners of investment properties, capital gains tax remains a separate consideration when selling. The current residential property capital gains tax rates are generally 18% and 24%, subject to the individual’s taxable income and available reliefs.
The distinction matters because capital gains tax on UK property is normally calculated on the taxable gain rather than the total property sale price.
A decision not to introduce a further tax increase in October does not remove the existing costs of owning and disposing of rental properties.
Will the Mansion Tax U-Turn Restore Confidence?
The immediate decision has removed one source of anxiety for owners of properties valued between £1.5 million and £2 million.
However, it does not necessarily mean that Southern England’s housing market will experience a rapid recovery.
Mortgage rates, borrowing capacity, stamp duty and household confidence remain influential factors.
The Conservative Party has also promised to abolish the mansion tax if it wins power, creating a further political disagreement over the future direction of property taxation.
Labour continues to argue for an additional charge on the most valuable residential properties, pointing to disparities between council tax bills on ordinary homes and exceptionally expensive properties.
Supporters of the surcharge regard it as a way to make property taxation more progressive. Critics argue that expensive homes are not always accompanied by high disposable incomes, particularly for older residents who purchased their homes decades ago.
There is also a wider debate surrounding the possible replacement of council tax and stamp duty with a system linked more directly to current property values.
Prime Minister Andy Burnham has previously supported property tax reform, but no complete replacement system has been enacted.
The potential impact of proportional property taxation remains especially important for landlords because a shift in responsibility from occupiers to owners could alter rental investment costs.
The mansion tax decision does not establish that such a wider reform will proceed.
As the 28 October Budget approaches, the property market will therefore be watching for clarification on whether additional changes to stamp duty, capital gains tax or other property-related liabilities are proposed.
For now, the most significant development is that homes valued between £1.5 million and £2 million have avoided being brought into the scheduled mansion tax through the proposed threshold reduction.
Owners of homes valued at £2 million or more still face the planned additional annual charges from April 2028.
For Southern England’s property market, that distinction will influence the financial calculations of homeowners, purchasers and investors as the government prepares to announce its next Budget.
