Chancellor Rachel Reeves will deliver her first full Autumn Budget on 26 November 2025. Although final measures are not yet confirmed, a consistent picture has emerged from Treasury briefings and economic reporting: a significant fiscal gap, restraint on headline tax rates and a shift towards threshold freezes, property-focused taxes and targeted reforms.
This alert summarises the expected direction of travel and highlights what UK businesses and particularly those planning to buy or sell a business, should be preparing for now.
1. Likely Tax Measures Affecting Businesses
Income tax: no rate rises, but higher effective tax
Reeves is expected to avoid increasing headline income tax rates, but to freeze thresholds for at least two further years, raising c.£7.5–8bn through fiscal drag. This will increase effective tax for owner-managers and senior staff and will raise employment costs for businesses.
Property taxes: main area of change
Reports suggest significant movement on property taxation, including:
· Council Tax reform and/or a new levy targeting high-value homes;
· Ongoing speculation around mansion-style charges and possible SDLT restructuring.
This will affect property-heavy businesses, corporate real estate structures and valuations in sectors reliant on high-value premises.
Property taxes: main area of change
Likely areas of tightening include:
· ISAs and tax-advantaged savings;
· elements of pension relief;
· potential adjustments to inheritance tax.
These will influence exit planning for founders and long-term wealth structuring following a sale.
Business taxation and partnerships
Proposed NIC changes for LLP partners and a possible “exit tax” on wealthy individuals have been dropped for now, but targeted anti-avoidance and technical reforms are still expected.
2. Implications for UK Businesses
Larger corporates
· Higher employment-related tax burdens will affect labour-intensive business models and EBITDA forecasts.
· Property-linked charges could increase occupational costs or impact portfolio values.
· Consumer-driven sectors may face softer demand if households experience higher wealth and property taxes.
SMEs and owner-managed businesses
· Threshold freezes will increase the tax burden on salaries and dividends.
· Changes to pension and savings vehicles will affect post-sale wealth planning.
· Any shifts in IHT may influence decisions around succession vs sale.
3. Effects on M&A: Buyers and Sellers
Valuation
Higher tax on labour, dividends and property will depress net cash flows, affecting deal pricing. Sellers may find near-term exits more attractive if post-Budget taxation becomes less favourable.
Deal structure
Potential SDLT or property-tax reforms may shift relative advantages of share vs asset purchases, especially for property-rich businesses.
Earn-outs and deferred consideration
Tax uncertainty increases the risk that deferred or contingent payments deliver lower after-tax value to sellers. Buyers may seek adjustment mechanisms for post-Budget tax changes.
Incentives and management equity
Changes to the treatment of salary sacrifice, pensions or share-based pay could require redesigning management incentive plans, particularly in PE-backed transactions.
SPA drafting
Expect heightened focus on:
· tax covenants and warranties,
· exposure to new property or wealth taxes,
· transitional rules and anti-forestalling risks.
4. What Businesses Should Do Before 26 November
If you may sell a business:
· Ensure the business is deal-ready so you can act quickly if the Budget accelerates your timetable.
· Model post-tax sale outcomes under multiple scenarios (income tax drag, IHT changes, ISA/pension tightening).
· Review family business and succession structures ahead of potential IHT reform.
If you are buying:
· Update valuation models with higher employment and property tax assumptions.
· Stress-test financing under tighter cash-flow scenarios.
· Prepare SPA wording addressing Adverse Tax Change risk between signing and completion.
5. What to Watch on Budget Day
· Final decisions on threshold freezes, dividend treatment and savings relief.
· Exact design of property tax reforms and SDLT changes.
· Effective dates, transitional rules and any anti-forestalling measures.
· OBR forecasts, which will influence deal appetite, lending and valuation multiples.
Summary
The Autumn Budget 2025 is shaping up to be tax-raising without rate-raising, with major implications for employment costs, property exposure and the personal tax position of business owners. For buyers and sellers, the next few weeks should be used to prepare flexibly so that once the Chancellor announces the detail, you can move decisively.
