UK Autumn Budget 2026: What Property Investors and Landlords Must Prepare For Now

The October 2024 Budget hit property investors with a 5% SDLT surcharge and a CGT rate hike on residential property — both from the date of announcement, giving sellers with live transactions no time to complete before the change. With the 2026 Budget expected in October, UK landlords and investors now face the same pre-announcement window: the only period where you can actually do something before the policy lands.

The short answer on what to do: review any planned disposals, refinancing, or portfolio restructuring now. The changes most likely to affect property investors in 2026 centre on inheritance tax, corporation tax for SPVs, and potential SDLT tweaks — not, at this stage, a further CGT rate increase. But "most likely" is not a guarantee, and the pre-Budget window closes when the Chancellor stands up.

What is the UK Autumn Budget? The Autumn Budget is the Chancellor of the Exchequer's annual fiscal statement to Parliament, typically delivered in October or November, setting out government spending plans and all tax changes for the year ahead. For property investors, it is the single most consequential policy event of the year — Budgets have historically changed stamp duty, capital gains tax, mortgage interest relief, and housing supply policy, often with immediate effect from the date of announcement, not from the following April.

The fiscal backdrop: why property is always in scope

Residential property is the UK's largest asset class — accounting for roughly 62% of household net wealth according to ONS Wealth and Assets Survey data. That makes it an irresistible target whenever the Treasury is under fiscal pressure, and the OBR's most recent forecasts confirm the pressure is real: the UK's underlying debt interest bill remains elevated following years of higher gilt yields, and the government's spending commitments in health, defence and infrastructure leave limited headroom.

Property-related taxes — SDLT, CGT on residential disposals, and Inheritance Tax on estates containing property — collectively raise over £20 billion per year for the Exchequer. Any Budget that needs to find additional revenue will look here first.

"Residential property transactions in England and Wales ran at approximately 88,000 per month in the first half of 2026 — down 9% year-on-year, with investor purchases disproportionately affected by the October 2024 SDLT surcharge increase." — ONS UK House Price Index, August 2026

1. Capital gains tax on residential property

The October 2024 Budget raised CGT rates on residential property to 18% for basic-rate taxpayers and 24% for higher-rate taxpayers, while simultaneously extending Private Residence Relief for homeowners. Investors selling investment properties now pay at the 18%/24% rates with no Annual Exempt Amount above £3,000.

The question for 2026 is whether rates rise further. Most credible analysis — including commentary from HMRC's independent OTS successor body — suggests further rate alignment (bringing residential property CGT fully in line with income tax) is a medium-term risk rather than a 2026 certainty. The 2024 changes have already dampened transaction volumes; a further rate hike risks a lock-in effect that would reduce CGT receipts, not increase them.

If you have a significant deferred gain on an investment property and were already considering a sale in the next 12–18 months, the pre-Budget window deserves a serious conversation with your accountant. If rates do not change, you have lost nothing by being prepared. If they do, completing before the announcement date is the only way to lock in current rates — and you cannot complete in a week.

2. SDLT: the 5% additional dwellings surcharge

Since October 2024, investors purchasing additional residential properties in England and Northern Ireland have paid a 5% SDLT surcharge on top of the standard rates — effectively making the total SDLT on a £250,000 BTL property £12,500 before any other transaction costs. Scotland (LBTT) and Wales (LTT) have their own equivalents at broadly similar levels.

A further rate increase in 2026 looks unlikely on pure economics — transaction volumes are already subdued and the government's own housebuilding targets depend on a functional investment market. More plausible is a targeted tweak: either a relief for specific property types (energy-efficient homes, social housing conversions, co-living developments) or a discount for build-to-rent institutions. Neither change would reduce the cost for the typical individual BTL investor.

One area to watch: the government has been consulting on whether to extend SDLT relief for first-time buyers purchasing with a family member. Any such change could affect investors who hold property jointly with a first-time buyer partner — currently the FTB surcharge exemption does not apply if any buyer already owns property.

3. Inheritance tax and property

This is arguably the highest-stakes area for established landlords in 2026. The October 2024 Budget confirmed that pension assets would become subject to inheritance tax from April 2027 — a change that transforms the IHT planning calculus for landlords who had been sheltering wealth in SIPPs. The 2026 Budget may introduce further detail on implementation, or — in the worst case for investors — extend the IHT net to other asset classes currently benefiting from relief.

Business Property Relief (BPR) is the current protection for qualifying commercial property held within a business. If a landlord can demonstrate their portfolio constitutes a trading business (rather than a passive investment), BPR could reduce the IHT exposure on the portfolio by 50% or 100%. A tightening of BPR eligibility rules — flagged in multiple pre-Budget consultations — would remove this planning option for many portfolio landlords.

"Transfers of residential property into trust before death are subject to a 10-year periodic charge of up to 6% of the trust's value under the current IHT framework. Estate-planning structures that appeared settled in 2022 may now need reassessment in light of the 2024 and proposed 2026 changes." — Nationwide HPI and HMRC IHT receipts analysis, Q2 2026

4. Corporation tax and the SPV landlord

Many portfolio landlords restructured into Special Purpose Vehicles (limited companies) following Section 24 mortgage interest relief changes, which phased out personal name mortgage interest deductibility between 2017 and 2020. A limited company pays corporation tax on profits at 25% (for profits over £250,000) rather than up to 45% income tax for a higher-rate individual taxpayer — a significant structural advantage.

The 2026 Budget risk here is a reduction in the Small Profits Rate (currently 19% for profits up to £50,000) or an increase in the main corporation tax rate. Neither change is widely forecast, but the erosion of the SPV advantage — even a 2–3 percentage point increase in the effective tax rate — changes the buy-or-hold decision for properties that are only marginally profitable.

Equally important: the 2026 Budget may clarify the tax treatment of property income through SPVs following HMRC's ongoing consultation on the treatment of furnished holiday lettings (FHL) income in corporate structures. The FHL regime was abolished for individuals from April 2025 — the corporate equivalent is still being worked through.

5. Section 24 — could anything change?

Section 24 of the Finance (No. 2) Act 2015 removed the ability for individual landlords to deduct mortgage interest as a business expense, replacing it with a 20% tax credit. The change has been fully in force since April 2020. The political direction of travel — from any party — makes a reversal essentially impossible.

What could change is the percentage credit itself. Some landlord lobby groups have pushed for a return to the 25% credit that applied during the transition period, or for the credit to be calculated on the property's gross rental income rather than the finance cost. This remains a long-shot, but it is the one area where a Budget change would unambiguously help personal-name landlords.

Pre-Budget risk matrix

Area	Likely in 2026 Budget	Risk level
CGT residential property rate increase above 24%	No — analysts consider further increases unlikely this cycle	Low
SDLT surcharge increase above 5%	No — transaction volumes already depressed	Low
SDLT targeted relief (BTR, energy-efficient)	Possible — under consultation	Medium
IHT Business Property Relief tightening	Possible — flagged in consultations	Medium-High
IHT pension rules (April 2027 implementation detail)	Likely — Budget will clarify mechanics	High (for SIPP holders)
Corporation tax rate increase	Unlikely at this stage	Low-Medium
Section 24 reversal or credit increase	No	Very Low

What to do before the Budget announcement

Review any planned property sales

If you have a property you were planning to sell in the next 12 months, now is the time to model the numbers at both current and higher CGT rates. If the figures work now and only marginally work at a higher rate, bring the sale forward. Remember that the window is shorter than it feels — instructing an agent, finding a buyer, and completing a sale takes a minimum of 8–12 weeks in most markets. The Budget is likely in late October.

Audit your IHT position

If your estate includes significant property holdings — particularly properties held personally rather than in a company structure — book a review with an estate planning solicitor before the Budget. Any changes to BPR eligibility or IHT treatment of property-rich trusts could have immediate effects on structures established in prior years.

Review SIPP and pension strategy

With the April 2027 pension IHT changes already confirmed, the 2026 Budget will likely set out the implementation framework in detail. If you have been using a SIPP as an IHT shelter (a common strategy for landlords who have sold properties and reinvested the proceeds), this year's Budget may be your last opportunity to review that structure before the new rules crystallise.

Model a refinancing now, not in November

The Bank of England base rate has fallen to 4.0% through 2026 — a meaningful improvement from the 5.25% peak. Use our BTL mortgage calculator to model the post-refinance position now, because if Budget changes tighten lending criteria or affect ICR calculations, waiting until post-Budget may mean worse terms on your remortgage.

The investor takeaway

• CGT and SDLT rate increases are low probability in 2026 — but IHT changes affecting Business Property Relief and SIPP implementation are much more likely. That is where the real planning risk sits.
• Pre-Budget action only works if you can complete before the announcement. Budget changes typically take effect from the date of the Chancellor's speech. A sale that completes the day after is subject to the new rate. Build in time.
• The worst outcome is inaction based on speculation. Investors who held properties through the 2024 Budget waiting for CGT to come down found rates went up instead. Review the numbers, talk to your accountant, and make a decision — don't wait for certainty that will never come.
• Limited company structures remain advantageous post-2026 for most higher-rate taxpayers — unless corporation tax rates move, which remains a low-probability scenario. New acquisitions still benefit from the SPV structure in most cases.
• The Budget is one event, not the whole picture. The Renters' Rights Act, EPC C by 2030, and ongoing mortgage rate movements will collectively have more impact on your portfolio returns than any single Budget announcement. Keep perspective while taking the right pre-Budget precautions.

Use the pre-Budget period for what it is: a planning window, not a panic event. Investors who are clear on their numbers, their IHT exposure, and their exit plans in the next 12–18 months have real decisions to make now. Everyone else can watch the announcement with calm — and act on the detail once the specifics are confirmed.