Autumn Budget 2026: Potential tax changes and stock market sector impact

The Autumn Budget is scheduled for 28 October 2026. With the government committed not to raise the main rates of income tax, employee National Insurance or VAT, and corporation tax expected to remain capped at 25%, the focus is likely to fall on capital gains, property, pensions, sector levies, business rates and tax reliefs as Chancellor John Healey seeks to rebuild his fiscal buffer after the sharp spike in bond yields eroded his headroom. Moreover, this is likely to be a placeholder Budget as the prime minister, Andy Burnham, has indicated any major changes (such as ending the pension triple lock to pay for a national care service) will be reserved for the next Labour manifesto. As such sweeping fiscal reform looks off the table; but targeted tax moves could have market impact on various stock market sectors.

None of the measures below is confirmed but presenting them is intended as a guide to what could transpire and what potential upside and downside risks exist for UK stocks and sectors. It’s important not to make financial decisions based on what could change but be aware of the potential risks, whilst also analyse what is expected to happen versus what would constitute a surprise. Individual stocks are mentioned as illustration and does not include company-specific factors.

Most plausible tax changes

1. Higher capital gains tax
   A moderate increase in CGT, possibly accompanied by indexation or incentives for longer holding periods, appears more plausible than full alignment with income-tax rates. This could discourage disposals, reduce investment turnover and affect wealth managers, platforms, property companies and smaller quoted businesses whose owners may be considering exits. Full alignment of CGT with income tax would be a major downside surprise for UK shares across the board. We had a detailed look at the impact of higher CGT here.

2. Changes to pensions and tax-free cash
   Thankfully this year there has not been the same rumours about pension tax relief, which prompted many people to sell down holdings before the Budget only for there to be no reduction in relief. Nevertheless, possible measures include restrictions on pension tax relief, employer contributions or the tax-free lump sum. These would affect long-term savings flows and could be negative for life insurers, asset managers and investment platforms. Major overhaul of pension tax relief, such as flattening the top rates to 20% or reducing the tax-free lump sum people can take from their pension, would have broad UK equity market impact.

3. Property and land taxation
   Options reportedly under discussion include higher taxes on property gains, landlord income, high-value homes and reform of stamp duty or council tax. Housebuilders could benefit from transaction-tax reform but suffer if high-value housing or landlord demand is targeted. REITs and estate agents are also exposed. A new Help to Buy scheme has already been announced, which is a boost for housebuilders, though it’s unclear if there is further support coming.

4. Business-rates reform
   The government has already signalled lower business rates for pubs and clubs. A broader redistribution away from hospitality and physical retail, potentially toward warehouses or digital businesses, would create clear subsector winners and losers.

5. Sector-specific windfall taxes or levies
   Banks, energy producers, utilities, gambling companies and large digital businesses are potential targets when broad-based tax increases are politically constrained. Such measures would present the clearest direct downside risk to earnings and dividends. I highlighted how banks could be the easiest targets by far for the Chancellor here.

6. Higher defence, infrastructure and regional investment + R&D focus
   This is primarily a spending rather than tax story, but additional investment in defence, shipbuilding, clean energy, transport and regional development could offset tax pressure in selected industrial and construction stocks. Recent reports the government is delaying its decision on increasing defence spending to 3% of GDP has weighed on the sector, but a clear commitment in the Budget to cover the existing £4.7bn shortfall in the government’s defence investment plan would likely be seen as a positive catalyst. There could also be important funding and tax measures for life sciences R&D supportive of the pharma industry such as extending the R&D tax credit to capital expenditure and committing to fully funding the recently announced medicine evaluation and adoption pilots. Also, we should note recent reports the government remains committed to the Oxford and Cambridge corridor to create ‘Europe’s Silicon Valley’ and are looking for any further concrete commitments on this front.

Most important market read-throughs

Potential winners

• Defence and aerospace: additional procurement, shipbuilding and security expenditure – need to plug £4.7bn shortfall. Healey resigned from MoD over pace of reaching 3% of GDP – will he preside over the exact same delays but as Chancellor?

• Construction and infrastructure: regional investment, transport and housing programmes.

• Pubs and selected high-street retailers: confirmed or expanded business-rate relief. Supporting pubs is very much Burnham territory politics.

• Medical equipment and healthcare services: Investment to support life sciences R&D, health spending ratchet maintained.

• Housebuilders: only if the Budget prioritises stamp-duty or planning reform rather than new property taxes. Help to Buy already announced – govt knows housebuilding is key to votes.

Most exposed

• Banks: vulnerable to a sector surcharge or windfall-style levy. Could be offset with lower capital requirement, encouraging lending.

• North Sea producers: exposed to an extension or tightening of the energy-profits regime. Energy profit levy (EPL) current 38%, due to be replaced in 2030 with more targeted windfall tax rate of 35% only when prices are >$90 on Brent. 

• Gambling companies: vulnerable to higher remote-gaming, machine or general betting duties. Gambling risk is real but more specifically aimed at machine gaming duty on land-based machines than a broad-based levy, which matters for how you'd view diffusion of the imapct.

• Asset managers, platforms and life insurers: exposed to CGT, ISA and pension reform.

• REITs and property services: exposed to business-rate redistribution and high-value property taxation.

• Alcohol and tobacco producers: perennial revenue-raising targets through excise duties.

The equity impact is likely to come less from a change in the main corporation-tax rate and more from targeted interventions. The key dividing line is between sectors that could fund the Budget, notably banks, energy, gambling, property and wealth, and those positioned to receive spending, notably defence, infrastructure, healthcare and regional development.

For investors, the three most important questions on 28 October will be:

1. Does the Chancellor impose new sector-specific levies?

2. Are CGT, pensions or property taxes changed materially enough to alter household investment behaviour?

3. Which industries receive the proceeds through public investment and tax incentives?

4. Is your portfolio exposed to material Budget risk?

Table: Impact across the 11 FTSE sectors

Detailed map across 20 FTSE subsectors

The following 20 subsectors capture the most material listed-equity sensitivities while providing coverage of all 11 headline ICB sectors.