UK Autumn Budget 2026: What Changes Are Likely and How to Prepare Your Finances

What the Autumn Budget is and why it matters

The UK Autumn Budget is the government's main mechanism for announcing tax changes that take effect from the following April. Unlike the Spring Budget — which tends to confirm existing plans — the Autumn Budget is where significant new tax policy is most commonly introduced. The October 2024 Autumn Budget raised CGT rates, altered stamp duty, and introduced pension IHT; it is the model for what October 2026 could look like.

The budget process runs to a fixed cycle: the Chancellor presents their statement in the House of Commons, the Office for Budget Responsibility (OBR) publishes updated economic forecasts simultaneously, and the Finance Bill containing the legislative changes follows in the weeks after. Most changes take effect from 6 April of the following tax year, though some (such as CGT rate changes) can take effect on Budget day itself.

The current tax landscape: what is already locked in

Before assessing what might change, it is worth being clear about what is already legislated and not up for debate at the Autumn Budget.

Income tax thresholds — frozen until April 2028

The Personal Allowance (£12,570), Basic Rate Band (£12,571–£50,270), and Higher Rate threshold (£50,270) are frozen in legislation until April 2028. This is not a policy choice the Autumn Budget 2026 can easily reverse — it would require new primary legislation. What the Budget could do is signal what happens from 2028/29 onwards.

The impact of this freeze is substantial. With wages rising at 4–5% annually, more taxpayers cross threshold boundaries each year without any change in legislation. HMRC estimates approximately 600,000 extra taxpayers enter the 40% band each year of the freeze, purely from wage growth rather than any active tax rise.

Capital Gains Tax — rates set from October 2024

The October 2024 Budget raised CGT rates:

• Basic rate: 10% → 18% (non-residential assets)
• Higher rate: 20% → 24% (non-residential assets)
• Residential property (higher rate): 24% (unchanged from October 2024 increase)

These rates are in place now and are not expected to change in the Autumn Budget 2026, though nothing prevents a further revision. The annual exempt amount (£3,000 for 2026/27) is also frozen.

Pension IHT — already legislated from April 2027

The October 2024 Budget legislated that unspent pension pots will form part of the estate for Inheritance Tax purposes from 6 April 2027. This is not a Budget 2026 change — it is already passed into law. However, the implementation details (including how the tax will be collected from pension providers) are still being consulted on by HMRC, and the Autumn Budget 2026 may include technical clarifications.

What could actually change in October 2026

The following areas have been discussed in parliamentary debate, think-tank analysis, and media reporting. This is analysis of what is plausible, not prediction. Always verify against the actual Budget statement when it occurs.

Income tax: threshold freeze extension or unfreeze signals

The current freeze ends in April 2028. The Autumn Budget 2026 would be a natural moment to signal whether:

• The freeze will be extended beyond 2028 (raising revenue without a rate rise)
• Thresholds will rise with inflation from 2028/29 (a crowd-pleasing announcement ahead of any election cycle)

Any announcement here is likely to be prospective (affecting 2028/29 onwards) rather than immediate.

Capital gains tax: further alignment with income tax

When CGT was raised in October 2024, the reform stopped short of full alignment with income tax rates (which would mean 20%/40%/45%). Some economists and the Institute for Fiscal Studies have advocated for full alignment. Another step towards this in October 2026 is plausible but not inevitable.

If you hold assets with significant unrealised gains, the period before the Autumn Budget is a prudent time to review whether crystallising some gains at current 24% rates makes sense against a potential future rise. This is a personal decision depending on your circumstances.

Inheritance tax: allowance adjustment or reform

IHT rates (40% above £325,000, or £500,000 with residence nil-rate band) and thresholds have been frozen since 2009. With UK house prices having roughly doubled since then, IHT is affecting a much broader population. The Autumn Budget could:

• Extend the threshold freeze (current policy to 2030)
• Announce consultation on reform of business property relief (BPR) and agricultural property relief (APR), following October 2024 changes
• Clarify the pension IHT implementation mechanism

Dividend allowance: potential further reduction

The Dividend Allowance has been cut multiple times: from £5,000 (2016) to £2,000 (2018) to £1,000 (2023) to £500 (2024). Further reduction — or even elimination — is technically possible, though reducing a £500 allowance further has limited revenue effect.

Stamp Duty Land Tax

The temporary higher thresholds introduced in September 2022 and extended multiple times are now largely expired. SDLT for residential property returned to its previous structure in April 2025. Further changes are possible but are usually driven by housing market conditions at the time of the Budget.

Proactive steps to take before October 2026

None of the following actions require correctly predicting what the Budget will contain. They are prudent financial planning regardless.

1. Maximise your ISA allowance now

Your £20,000 ISA allowance for 2026/27 is available from 6 April 2026. Money invested inside an ISA is protected from any future CGT, dividend tax, or interest tax changes. ISA rules themselves have been stable for years, and mid-year changes affecting already-subscribed amounts are extremely rare.

Even if you invest only part of your allowance before October, that money is sheltered regardless of what the Budget does.

2. Review unrealised capital gains

If you hold assets outside an ISA with significant unrealised gains, consider whether crystallising some or all of those gains at current rates (18%/24%) makes financial sense. You do not need to wait for the Budget to know whether current rates are lower than rates might be.

Example calculation:

If you plan to sell these shares within 3 years anyway, and you believe CGT rates may rise, selling before October 2026 locks in the current 24% rate. If rates stay the same, you lose nothing (other than the time value of money on the CGT payment).

3. Pension contributions

Basic and higher-rate tax relief on pension contributions is confirmed at current rates for 2026/27 and 2027/28. There is no current proposal to reduce pension tax relief, but it has been discussed as a reform option. If you have unused pension carry-forward allowance (see our separate guide on pension carry-forward), using it before April 2027 locks in the relief at current rates.

4. Inheritance tax planning

If your estate is approaching or above the IHT threshold (£325,000, or £500,000 with the residence nil-rate band), the October 2026 Budget is a plausible moment for further IHT reform. Review:

• Pension pots: these will be included in your estate from April 2027 regardless. If you have a large unused pension, your IHT position already needs reviewing.
• Gifts: annual IHT exemption (£3,000/year) and potentially exempt transfers (PETs) become exempt after 7 years. Making gifts now starts the 7-year clock.
• Business and agricultural property: the October 2024 Budget introduced a £1m cap on 100% relief for BPR/APR; further changes to these reliefs are possible.

What the Budget cannot do: your protections

It is worth being clear about what the Budget cannot retroactively change:

• ISA gains already made are tax-free permanently — a future Budget cannot tax growth within an existing ISA
• Pension contributions already made receive their tax relief when made — contributions in April 2026 cannot be retrospectively taxed at a higher rate
• Gifts already made start the 7-year clock from the date given — a future Budget cannot reset this retrospectively

Acting before the Budget does not require certainty about what the Budget will contain. It simply takes advantage of the rules as they stand today.

Using OBR forecasts to assess likely pressure

The Office for Budget Responsibility publishes Economic and Fiscal Outlooks alongside each Budget. The Spring 2026 forecast will give a view of the UK's fiscal headroom — how much the government can afford to spend without breaching its own debt rules.

If fiscal headroom is tight (which OBR forecasts through 2026 suggest), the government faces pressure to raise revenue or cut spending. In this environment, tax rises or further freezes are more likely than cuts. The Autumn Budget comes after the OBR's updated forecast, meaning the Chancellor has a clear picture of fiscal space before making announcements.

Watch the OBR's Spring 2026 forecast for:

• Whether fiscal headroom is above or below £10bn (below this, tax rises become more likely)
• Revised economic growth forecasts (lower growth = less revenue = more pressure)
• Debt interest projections (higher gilt yields increase borrowing costs and constrain the Chancellor)

Official sources to monitor

For authoritative information on Budget dates, announcements, and policy:

• gov.uk/government/organisations/hm-treasury — Budget documents and tax consultation papers
• obr.uk — Economic and Fiscal Outlook publications
• legislation.gov.uk — Finance Acts as they are passed
• HMRC technical consultations — often published 3–6 months before Budgets for significant changes

This article will be updated when the Autumn Budget 2026 date is confirmed and again following the statement. All figures and projections here are based on publicly available information as of May 2026.