Autumn Budget 2025: What it means for homeowners, landlords, and the UK housing market

Four key outcomes

1. A new annual surcharge on high-value homes from April 2028

Commonly described as the ‘mansion tax’, homes in England valued at £2 million or more will pay an extra levy on top of normal council tax. Illustrative figures for properties valued at:

• £2.0m – £2.5m: the surcharge starts at £2,500 per year
• £5m+: the highest band will pay up to £7,500 per year.

Impact on homeowners:

The mansion tax affects a small fraction of UK properties – fewer than 1% nationally and mainly concentrated in London and the Southeast.

As the surcharge is annual and revaluations will take place every five years – the measure may change the way forward for long-term owners of prime property. Impacted homeowners may need to reconsider expensive renovations, downsize, or selling before valuations rise.

2. A rise in income tax on property (rental) income from April 2027

Landlords will face higher tax rates on rental profits, with a 2% increase across the three income tax bands. The new rates for property income are:

• Basic: 22%
• Higher: 42%
• Additional: 47%

There was speculation that property income would be subject to national insurance payments, but this did not become a reality this time round.

Impact for landlords and private rental providers:

The 2% increase in property income tax will squeeze landlord net returns. Some landlords may pass these costs on via rent increases, others – especially smaller landlords or those with marginal portfolios – may exit the market entirely.

The change also adds more financial pressure at a time when the rental market faces other headwinds (cost-of-living pressures for tenants, regulation changes, demand shifts), making long-term planning for landlords more difficult. 

3. No fundamental overhaul to Stamp Duty Land Tax (SDLT)

Despite lots of speculation, there was no radical overhaul of SDLT for owner-occupied property. The existing SDLT regime effectively remains in place.

4. Supply-side commitments

Beyond taxation, the Budget reaffirmed the government plans to deliver a substantial increase in funding for social and affordable housing, plus reforms to planning systems to speed up housebuilding.

Over the medium term, additional supply could ease price pressures and improve affordability, though timing and local implementation will matter.

Outlook for the mortgage market

For most homebuyers (purchasing properties below the £2m threshold), the Budget brought no new stamp duty hikes or purchase-tax reforms. As such, first-time buyers and owner-occupiers should see a stable tax environment (at least on purchase).

On the supply side, the government’s commitment to build hundreds of thousands of socially-rented and affordable homes – backed by billions in public funding – could moderate upward pressure on prices over the medium term.

What this means for the broader housing market

The Autumn Budget signals a shift in emphasis: generating sustained revenue from existing property, particularly at the high end. The mansion tax and rental-income tax changes suggest the government is targeting wealthier homeowners and investors, rather than first-time buyers, or ordinary homeowners.

For the upper end of the market this may dampen demand. Property experts warn of “price bunching” – where sellers deliberately price properties just under the £2m threshold to avoid the surcharge.

For the rental sector, reduced yields may push some owners to offload properties – further tightening rental supply or prompting higher rents for tenants. 

Conversely, the boost in social and affordable housebuilding and planning reforms could gradually improve housing supply, which over time may relieve some pressure on housing costs.

Considerations

For high-value homeowners

• Valuation check: If you are near the £2m threshold, review the latest market comparables and consider timing for any planned renovations or potential sales.
• Cashflow modelling: Consider how best to budget for the annual surcharge from 2028 and potential changes after revaluations. A wealth planner can support with this financial planning tool.

For landlords

• Tax scenarios: Calculate your portfolio’s after-tax returns using the new rates to see how they affect overall profitability. Factor in mortgage interest, maintenance, and management costs. Identify low-performing units early and consider whether restructuring – such as incorporation – could improve your tax position.
• Finance review: Explore refinancing options to lock in competitive rates and improve cash flow. Consider adjusting loan-to-value ratios where possible to reduce risk and reviewing whether moving properties into a company structure offers long-term benefits. Always weigh these changes against costs and compliance requirements.
• Seek advice: Talk to our Real Estate Finance team for advice and support. We have deep connections across the industry and offer solutions across a range of different asset classes within residential and commercial, investment and development.

For buyers and movers

• Stamp duty: Plan purchases with the current SDLT rules in mind.

Final thoughts

  
The Autumn Budget 2025 sends a clear signal: residential property, particularly at the top end and in rental investment, will face tighter, ongoing taxation. For most owner-occupiers under the £2m threshold, the landscape remains stable. For landlords and high-value homeowners, however, these measures change the financial calculus – making portfolio discipline and strategic planning more important than ever.

Over the next few years, the interplay between the ‘mansion tax’, higher property income tax rates, and housing supply initiatives will influence prices, rents, and ownership patterns across the UK.

Need guidance on how these changes affect your property plans?

Speak to your banker today for tailored advice and support on financing, tax planning, and strategic next steps. Not yet a client? Please get in touch for a call back from our team.