Autumn Budget 2025: What It Means For Homeowners and Landlords

If you were watching the headlines yesterday, you probably saw the chaos unfold before the Chancellor even stood up. In an unprecedented move, the Office for Budget Responsibility (OBR) accidentally published its analysis online minutes before Rachel Reeves started speaking. It was a final, chaotic moment in a run-up characterised by frequent leaks, wild media speculation, and questions about the leadership of the Prime Minister and Chancellor.

Reluctant to cut spending, but under immense pressure to demonstrate “fiscal responsibility,” the Chancellor delivered a massive £26bn tax-raising package.

Rumours That Didn’t Materialise

There is still no capital gains charge on selling your primary residence – selling your main home remains tax-free. The government was also considering introducing National Insurance charges on landlord rental income, but this didn’t materialise either.

The silence on stamp duty was notable. Buyers in England and Northern Ireland will continue to pay stamp duty on homes purchased for over £125,000. If you’re buying your first home, there is still no stamp duty to pay on the first £300,000 of the property value, provided the property is purchased for £500,000 or less.

The “Mansion Tax” Arrives

The government has carefully branded this the “High Value Council Tax Surcharge”. Crucially, this isn’t a percentage wealth tax (like 1% of the property value), but a flat-rate surcharge added to your Council Tax bill for properties valued over £2 million. It comes into effect in April 2028, with the majority of homes impacted located in London and the South East.

This targets the top 0.5% of homes, and we expect to see a surge in equity release enquiries, as asset-rich, cash-poor homeowners may need to release funds to settle their yearly bill to the government.

Fiscal Drag Impacts Affordability

The Chancellor extended the freeze on income tax thresholds until 2031. This is arguably the biggest issue for mortgage borrowers. As wages rise with inflation, more people will be dragged into higher tax brackets, raising considerable revenue for the Treasury.

This is a direct hit to mortgage affordability. When lenders calculate how much you can borrow, they look at your net disposable income. If taxes eat up a larger chunk of your pay, your borrowing power could decrease. It also makes it harder to save for a deposit.

More Pain for Small Landlords

The government has effectively separated and recategorised rental income as a unique form. From April 2027, rental income will be taxed at new rates 2 percentage points above the standard income tax rates.

• Basic Rate: Rises from 20% to 22%
• Higher Rate: Rises from 40% to 42%
• Additional Rate: Rises from 45% to 47%

This applies more pressure on a sector many are already exiting from due to increased costs and the upcoming Renters’ Rights Bill. We expect smaller landlords to continue exiting the sector, with more consolidation of properties into the ownership of larger operators who can handle the regulatory burden. It’s also likely to impact smaller landlords more harshly, as professional operators are more likely to own their properties through Limited Company Structures (SPVs), which are not subject to these personal tax rates.

More Fiscal Headroom Could Provide Relief for Mortgage Rates

The Chancellor successfully doubled her fiscal headroom from a precarious £9.9bn to a healthier £21.7bn. The markets have reacted positively, and Gilt yields dropped immediately after the initial speech. In the short term, this stability is excellent news and should help suppress fixed rates.

A word of caution: The OBR’s official forecast accompanying the Budget was less optimistic for the long term, predicting that average mortgage rates might drift up to 5% by 2029 due to stubborn inflation. So, while the Budget prevents a spike in rates today, we aren’t returning to the era of 2% mortgages anytime soon.

Final Thoughts

This was a budget for stabilisation rather than growth. For borrowers, boring is good, as it keeps rates steady. However, frozen tax thresholds can affect affordability, and there are concerns that the “mansion tax” could expand down the property ladder. If you’re looking to buy or remortgage, the window of stability is open, but the long-term forecast suggests costs are only going one way.