IFS: Healey Needs £35bn or Budget Is 'Work of Fiction'

What is the £35bn budget challenge?

The Institute for Fiscal Studies has warned Chancellor John Healey he must find about £35bn in extra funding or his 28 October budget risks becoming a “work of fiction”. The IFS estimate, reported by the BBC, comes as UK diesel prices hit a record 200.01p per litre and global fuel disruption feeds inflation, squeezing the chancellor’s fiscal headroom.

The IFS green budget report, published on 12 October, says higher inflation linked to the war in the Middle East and Russia’s invasion of Ukraine has eroded departmental budgets. At the same time, the government’s commitment to raise defence spending to 3% of GDP by 2030 creates a structural gap. The result, according to the think tank, is that holding overall spending totals unchanged would imply real-terms cuts to public services later in the decade.

Why the IFS says a “steady-as-goes” budget is not an option

IFS director Helen Miller said a budget that avoids hard choices would be “pencilling in implicit cuts” Healey has no intention of delivering and would therefore be “a work of fiction”. She urged the chancellor to set credible spending envelopes now rather than defer decisions to next year’s spending review.

The IFS calculates that higher borrowing costs will add roughly £10bn to debt interest by 2029-30. That would leave about £20bn of fiscal headroom, down from the Office for Budget Responsibility’s spring forecast of £24bn. Tax revenue boosted by inflation may offset part of the shock, leaving a net hit of about £4bn, but the combined defence and public-service pressure still requires £35bn in new money or equivalent savings.

Defence spending and tax pledges complicate the arithmetic

Healey has repeated Labour’s manifesto pledge not to raise income tax, National Insurance or VAT. That leaves limited options: cuts to unprotected departments, welfare reform, or tax increases on wealth, savings and rental income. The UK defence spending target of 3% of GDP by 2030 adds to the pressure. The IFS notes that any “breathing space” for households is likely to be temporary and limited.

What the £35bn gap means for households and markets

The pre-budget warning lands as UK diesel costs surge. The RAC says average diesel hit a record 200.01p per litre in early October, while petrol averaged 174.71p. Brent crude, which traded just above $70 a barrel before the US-Israel war with Iran, spiked above $120 before settling near $100 after peace talks collapsed.

Fuel costs feed directly into haulage, farming and school transport, and the UK diesel price surge is one reason inflation expectations have worsened. The AA called the situation “dismal”, and Federal Reserve governor Christopher Waller warned that energy costs could stay elevated because of tanker insurance and ship-to-ship transfers needed to guard against Iranian attacks in the Strait of Hormuz.

Expert reaction and market implications

Treasury officials said the government remains committed to its fiscal rules with a buffer, pending the OBR’s October forecast. But bond investors are watching the budget closely: a credibility gap could push up UK gilt yields and mortgage rates, which have already risen above 6%.

The Independent’s economics commentator noted that the £35bn figure is a forecast built on assumptions, including whether defence spending actually reaches 3%, and could improve or worsen depending on US politics, energy prices and Middle East peace efforts. Yet the pressure is real, with council bankruptcies, potholes and court backlogs cited as evidence that doing nothing is untenable.

FAQ: IFS £35bn budget warning

Why does the IFS say the budget could be a work of fiction? Because without £35bn in new funding or cuts, the spending totals imply real-terms reductions to public services that the government has not committed to deliver.

What is driving the £35bn gap? Higher inflation from the Middle East war and Russia’s war in Ukraine, the pledge to raise defence spending to 3% of GDP by 2030, and rising borrowing costs.

How much fiscal headroom does Healey have? The IFS estimates about £20bn against the stability rule, down from £24bn in the OBR’s spring forecast, after accounting for £10bn in extra debt interest.

Will taxes rise? Labour has ruled out raising income tax, National Insurance and VAT, but the IFS says other tax rises or benefit cuts are needed to close the gap.

When is the budget? Chancellor John Healey delivers his budget on 28 October 2026.

Conclusion

Healey’s first budget will be judged less on headline giveaways than on whether the numbers hold. As the IFS puts it, a budget that pretends the £35bn gap does not exist is a “work of fiction” — and markets may not forgive the fiction.