Autumn Budget 2026: A UK CFO’s Scenario-Planning Checklist
UK CFOs should build three funded budget scenarios before 28 October, using OBR fiscal-headroom signals and confirmed tax targets as triggers. Chancellor John Healey delivers his first Autumn Budget 2026 that day, alongside a fresh Office for Budget Responsibility (OBR) economic and fiscal forecast, and finance teams without a pre-built response plan will be reacting in real time rather than executing a plan.
This is not a call to guess the Chancellor’s exact measures. It is a call to do what finance functions are built for: quantify exposure across a plausible range of outcomes, and know which lever moves first when the announcement lands.
What’s confirmed about the Autumn Budget 2026 so far?
The date and mechanics are fixed: 28 October 2026, with the OBR publishing its forecast alongside the Chancellor’s statement. Beyond that, CFOs are working with directional signals rather than detail. According to BDO’s Autumn Budget 2026 analysis, this would be Labour’s third consecutive tax-raising Budget, following the £41.5 billion package in 2024 and £26 billion in November 2025 — a pattern that matters more to scenario planning than any single rumoured measure, because it sets the scale finance teams should be modelling against.
The macro backdrop is tighter than it was a year ago. According to the Centre for Economics and Business Research (Cebr), UK GDP grew 0.4% in the second quarter of 2026 after 0.6% in the first, with Cebr forecasting just 1.2% growth for the year as a whole — below trend, and squeezed further by energy-price volatility linked to the Middle East conflict, which has pushed Bank of England rate cuts off the table for now. With government debt at roughly 95% of GDP and borrowing costs at multi-decade highs, the Chancellor has little room to manoeuvre without either raising revenue or trimming spending.
Executive Action:
- Calendar 28 October as a board-reporting checkpoint, not just a tax-team date.
- Brief the board now that a third consecutive tax-raising Budget is the base case, referencing the BDO pattern above.
- Flag the growth and rate backdrop to treasury: don’t assume rate cuts arrive on the previously expected timeline.
Which tax changes should CFOs build into their scenarios?
The government has ruled out increases to the “big three” — income tax, National Insurance and VAT — under its manifesto commitments. That pushes revenue-raising pressure onto a narrower set of levers, and CFOs should model exposure to each rather than betting on one.
The most-discussed targets include a higher bank corporation tax surcharge (commentators cite a possible move from 28% back toward the post-pandemic high of 31%), a possible windfall levy on energy or oil company profits given current price volatility, and continued speculation around capital gains tax — though Treasury modelling reportedly shows large CGT increases can reduce net revenue as asset owners simply defer disposals. Business rates policy also looks set to shift, with relief expansion for hospitality and high-street occupiers likely funded by higher rates on large warehouse operators — a direct cost-base and logistics-network planning issue for retail and distribution finance teams. Pension tax relief remains, in BDO’s words, “the most-discussed lever that has never quite been pulled,” and a mechanism that would let the government offset public-asset spending against borrowing — potentially freeing up to £9 billion a year by 2031 — is also in play as a way of creating headroom without a headline tax rise.
Executive Action:
- Quantify P&L exposure separately for bank-levy-style, CGT, business rates and pension-relief scenarios rather than a single blended estimate.
- If the business operates large warehouse or logistics space, model a business rates increase alongside any hospitality or high-street relief that might offset group-level exposure.
- Review pension salary sacrifice and pension-relief-dependent reward structures now, given the direction of travel already set by the 2029 salary sacrifice cap.
How should finance teams structure a three-scenario response?
A workable Budget-response model doesn’t try to predict the Chancellor’s speech. It builds three funded, board-ready positions the finance team can pivot between within days of the announcement: a base case reflecting current trajectory; a tax-heavy case modelling the specific levers set out above; and a fiscal-tightening case where spending-side conditionality (signalled welfare reforms, departmental spending discipline) reduces public-sector demand relevant to the business. This complements, rather than replaces, the broader capital allocation discipline CFOs have been rebuilding all year under sustained macro uncertainty — see our earlier briefing on capital allocation under uncertainty for the underlying framework.
Each scenario needs an owner, a trigger (the specific Budget line that activates it), and a pre-approved response — not a plan to convene a working group once the detail is public. Where capital projects sit near an approval threshold, run them through a formal capital approval assessment now so the board has a decision-ready view under each scenario, rather than reopening the business case in November.
Executive Action:
- Assign a named owner and trigger condition to each of the three scenarios before mid-October.
- Pressure-test capital projects near approval thresholds against all three scenarios using a structured capital approval assessment.
- Pre-clear communication lines with investor relations and the audit committee so scenario activation doesn’t wait on a full board cycle.
What should CFOs bring to the board before 28 October?
Boards will expect more than a watching brief. The CFO’s pre-Budget board paper should set out the three scenarios with quantified P&L and cash-flow impact, the specific triggers being tracked, and the decisions that need pre-approval so they aren’t delayed by a post-Budget board cycle — particularly on capital projects, pricing responses to any VAT or rates changes, and reward structures exposed to pension policy shifts. Where the finance function’s own self-assessment of Budget-readiness would help sharpen that paper, INFORMD’s executive self-assessment tools are a useful starting point before the board meets.
Executive Action:
- Present quantified, not qualitative, scenario impacts at the next board meeting ahead of 28 October.
- Get pre-approval for the decisions each scenario triggers, not just the scenarios themselves.
- Schedule a short post-Budget board update within 72 hours of 28 October to confirm which scenario is now live.
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The Autumn Budget 2026 is confirmed for Wednesday 28 October 2026. Chancellor John Healey will deliver it alongside a fresh economic and fiscal forecast from the Office for Budget Responsibility (OBR), his first Budget since taking the role.
Tax rises are widely expected. It would be Labour’s third consecutive tax-raising Budget, per BDO analysis. Income tax, National Insurance and VAT are reportedly protected under manifesto commitments, pushing pressure onto bank taxes, business rates, pension relief and other targeted levers.
Fiscal headroom is the buffer between government spending plans and its self-imposed fiscal rules, calculated by the OBR. Shrinking headroom — from weaker growth, higher rates or new spending pledges — increases the probability and scale of tax rises CFOs need to model.
Build three funded scenarios — base, tax-heavy and fiscal-tightening — each with a named owner, a specific trigger, and a pre-approved response. Bring quantified impacts to the board before 28 October rather than waiting for the announcement to start planning.
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