IFS Warns Healey's Budget Risks Being a 'Work of Fiction' Over £35bn Gap

The Institute for Fiscal Studies has told Defence Secretary-level budget custodian John Healey that his budget risks becoming a "work of fiction" unless he sets out plans to cover £35bn in spending pressures.

The warning comes from the IFS's influential pre-budget report, published as Britain's public finances face fresh strain from the war in the Middle East. The conflict is rattling the fiscal outlook through higher inflation, the thinktank said, and that inflation damage now sits at the centre of the chancellor's arithmetic.

The stakes are specific. According to the IFS, Healey faces a binary choice: he can top up the funds allocated to his current government spending plans, or he can impose deep real-terms cuts by the end of the decade. There is, in the thinktank's framing, no comfortable middle path that survives contact with the numbers.

Why does the IFS call the budget a potential 'work of fiction'?

The phrase is the sharpest line in the report, and it targets the gap between stated spending plans and the money actually available to deliver them. Without a clear plan to cover the £35bn in spending pressures, the IFS argues, the budget document would describe a fiscal position that does not exist in reality — hence the warning delivered directly to Healey by what the Guardian describes as Britain's leading tax and spending experts.

The charge is not that the numbers are wrong. It is that they are incomplete. A budget that leaves £35bn of identified pressures unfunded is, on the IFS's reading, a plan without a funding mechanism — a document that reads as policy but functions as postponement.

The thinktank's pre-budget reports carry weight in Westminster. Chancellors routinely brace for them, and the IFS's assessments of fiscal gaps and spending pressures frequently shape the pre-budget debate in the press and in Parliament. This year's intervention lands with particular force because of its timing message.

What does the IFS say the chancellor must do now?

The report's central recommendation is about the clock. The IFS urges that key decisions be made now — not put off until next year. Delay, on this argument, is itself a policy choice, and an expensive one: every month that passes without a decision on the £35bn gap narrows the chancellor's options and hardens the eventual adjustment.

The IFS lays out the decision in stark terms. Higher inflation, amplified by the war in the Middle East, has damaged the public finances to the point where the current spending envelope no longer covers the pressures built into it. Healey must therefore either:

• top up the funds behind his current government spending plans, or
• impose deep real-terms cuts by the end of the decade.

Both options carry political cost. Topping up the funds implies finding money — through borrowing, taxation or reprioritisation — at a moment when the war in the Middle East is already rattling the public finances. Deep real-terms cuts, the alternative, would bite into departmental budgets that have already absorbed years of pressure.

How did the Middle East war change the arithmetic?

The IFS points to inflation as the transmission channel. The war in the Middle East, the thinktank said, has pushed inflation higher, and higher inflation feeds through the fiscal system in ways that raise the cost of delivering the same real level of public services. Debt interest, benefit uprating and the general price of government purchases all climb when inflation does.

That dynamic is what turns a manageable planning problem into a £35bn one. The spending pressures the IFS identifies are the cumulative result of inflation damage running through the decade's fiscal forecast — damage the thinktank says must now be addressed in this budget rather than deferred.

The message to Healey is therefore less about a single year's figures and more about credibility across the forecast horizon. A budget that covers the pressures now, with named funding decisions, sets a track for the rest of the decade. One that does not leaves the deep real-terms cuts, or the funding top-up, as an unresolved liability landing on whichever fiscal event comes next.

On the IFS's timetable, that next event is precisely where the problem lies. The thinktank's pre-budget report urges the key decisions be made now — and its "work of fiction" warning signals how the fiscal institutions that judge these budgets will read a document that leaves the £35bn unanswered.