Autumn Budget 2025: how will it shape the FTSE 250?

Chancellor of the Exchequer Rachel Reeves faces the daunting task of closing a £22bn–30bn fiscal gap – and the measures she unveils on 26 November could ripple through the FTSE 250, an index dominated by domestically-focused companies. Potential tax hikes, spending shifts and a sharp squeeze on consumers are likely make the index more volatile in the months ahead as investors await the statement from the floor of the House of Commons and in the wake of the announcement as measures are implemented.

The big picture: fiscal tightening meets market sensitivity

The Budget is expected to deliver £30bn-£35bn in fiscal consolidation, with the burden falling heavily on households rather than corporates. While corporation tax is set to remain capped at 25% - the lowest in the G7 club of developed nations – other changes, such as a mooted hike in dividend tax, could hit income-focused investors and mid-cap companies reliant on equity financing.

The FTSE 250 has underperformed its bigger brother the FTSE 100 by more than ten percentage points in 2025 so far (as of 5 November). The midcap index is up 6.5% in the year to date compared with a gain of 17.5% for blue chips. Midcap-listed companies are particularly exposed because of the indexes domestic UK tilt. Unlike the FTSE 100, which earns 75%–80% of revenues overseas, many midcaps depend on UK consumer demand and business investment. Both these factors are now vulnerable to tax-driven headwinds.

Sector breakdown: winners and losers

Retail & Leisure:
Consumer-facing sectors are braced for pain. Rumoured increases in income tax, capital gains tax (CGT) and potential tweaks to value added tax (VAT) could dampen disposable income, squeezing retail and hospitality margins. Expect discretionary spending to weaken, which could be a direct blow to mid-cap retailers such as AO World, WH Smith, Currys and Pets at Home, as well as leisure operators including Domino’s Pizza, JD Wetherspoon, Rank Group and Wizz Air. 

Meanwhile, the National Living Wage is set to rise by 4% to £12.70/hour in April 2026, adding cost pressure onto employers already hit by last year’s employer National Insurance Contributions hike.

Property and Real Estate:
The government is considering replacing stamp duty land tax (SDLR) with a property tax on homes worth more than £500,000, shifting liability to sellers. This could slow transaction volumes and weigh on real estate investment trusts (REITs) within the FTSE 250. Higher CGT rates – potentially as much as 24% for higher-rate taxpayers – will further deter property investors. These include PRS REIT, which operates in the private rental sector, but any wider SDLT increases would impact Tritax Big Box REIT, which focuses on large-scale logistics warehouses, and British Land, which holds a broad commercial property portfolio. 

Financial Services:
Investment platforms and asset managers may see mixed fortunes. While cuts to overall Individual Savings Account (ISA) allowances are off the table for now, higher dividend taxes and CGT will reduce the attractiveness of taxable accounts. However, if the Budget limits tax-free cash ISAs, capital could flow into equities, benefiting brokers such as AJ Bell.

Industrial and Manufacturing:
The UK Corporate Tax Roadmap, published alongside the Autumn Budget 2024, sets out the government’s approach to corporation tax for the duration of the current parliament, aiming to provide stability and predictability for businesses. It allows full expensing of capital investment – and generous research and development (R&D) reliefs remain intact. This stable regimen remains good news for engineering and manufacturing mid-caps, which could leverage these incentives to offset rising wage and energy costs. These include aerospace and automotive engineer Senior, defence technology group Chemring and flow control group Rotork.

Potential FTSE 250 winners

Despite the gloom, some businesses could thrive because of their position in growth markets:

• Defence and Aerospace: with defence spending set to rise to 2.6% of gross domestic product (GDP) by 2027, contractors in the FTSE 250 may benefit from procurement tailwinds.
• Green Energy and Infrastructure: net-zero commitments and funding for gigafactories and hydrogen projects will support mid-cap companies in renewables and advanced manufacturing.
• Digital and R&D-heavy businesses: Continued support for R&D tax credits and Making Tax Digital reforms will favour tech-oriented mid-caps.

Volatility ahead: brace for choppy waters

So, heightened volatility in the FTSE 250 around UK Budget Day is expected for several reasons:

• Domestic exposure: the FTSE 250 is heavily weighted toward UK-focused companies making it more sensitive to fiscal policy changes than the globally diversified FTSE 100.
• Policy uncertainty: Investors anticipate measures to plug a large fiscal gap, including potential hikes in capital gains tax, inheritance tax, and income tax, as well as changes to business rates and stamp duty. These policies directly affect mid-cap firms’ margins and consumer demand, amplifying market reactions.
• Debt and gilt yields: concerns about higher borrowing costs and rising gilt yields ahead of the Budget have already unsettled markets. If the Chancellor signals aggressive borrowing – or fails to reassure on fiscal discipline – gilt yields could spike further, pressuring equity valuations – especially for mid-caps reliant on domestic credit conditions.
• Historical precedent: The memory of the 2022 mini-Budget crisis when Liz Truss was prime minister, which roiled UK assets, still looms large. While a repeat is unlikely, traders often hedge aggressively before major fiscal events, increasing intraday swings in mid-cap stocks. 

It is for these reasons that the FTSE 250 is the share index most prone to sharp moves when the Budget reshapes expectations on growth, taxation, and government borrowing.

The Autumn Budget is unlikely to spark a meltdown, but it will reshape the playing field for mid-cap investors. Expect greater volatility around the event, sector-specific winners and losers, and a renewed focus on fiscal prudence. For FTSE 250 companies, the challenge is clear: navigate higher operating costs and tax complexity while capitalising on targeted incentives. For investors, agility will be key – because in this Budget cycle, the devil is in the detail.