LeadershipNot yet confirmed elsewhere1 publisher2 min readPublished
Healey could push the IFS's £25bn inflation bill into next year
Chancellor John Healey may need an extra £25bn in 2029-30 to hold departmental budgets against war-driven inflation, by the IFS's estimate. He is not obliged to set spending totals in his 28 October Budget, so the choice between cuts and tax rises could wait until next year.
The Board Room · Leadership desk
Two estimates of the buffer against the fiscal rules. The OBR predicted £24bn at the time of the Spring Statement. The IFS expects a smaller headroom of around £20bn.
Headroom against the fiscal rules, by forecaster
| Item | Value | Claim |
|---|---|---|
| OBR, at Spring Statement | 24 £bn | 5 |
| IFS estimate (around) | 20 £bn | 5 |
What happened
- The IFS, like other analysts, thinks recent bond-market turbulence and higher inflation will add around £10bn to forecasts of the government's borrowing costs in 2029-30.
- It puts the buffer against Healey's fiscal rules at around £20bn, down from the £24bn the Office for Budget Responsibility predicted at the Spring Statement.
- The IFS also warned that the spending plans inherited from Rachel Reeves would leave some departments' budgets behind inflation in a few years' time.
- Healey said his Budget will pair "fiscal discipline" with "breathing space" for people, as he spoke ahead of this week's International Monetary Fund meeting.
Why it matters
- constraint Side by side, the IFS's £25bn is about £5bn more than its £20bn of headroom, so protecting every department in full with no new revenue would use up the whole buffer.
- decision Healey is choosing between settling the cuts-or-taxes question on 28 October and carrying an open gap into next year, and the IFS says leaving the inherited plans unaddressed would cast doubt on their credibility.
- precedent A Budget that meets the fiscal rules on the day tells planners little about 2029-30, because previous chancellors have used unrealistic pencilled-in plans to pass that test and changed them later.
Higher inflation lifts tax revenues, and the IFS cites that as one reason it still expects Healey to meet his fiscal rules [12]. It says recent indications are that markets would be comfortable with the smaller buffer [13]. The pressure falls on departments instead, because the same inflation erodes the value of their cash budgets [18]. As borrowing costs climb, the government also faces mounting pressure to show markets it has firm control of the public finances [19].
Helen Miller, the IFS director, ruled out two courses. "A 'steady-as-she-goes' Budget is not an option available to the chancellor," she said [10]. "Simply pencilling in implicit cuts that he has no intention of delivering would make the Budget a work of fiction," she added [11].
The headroom and borrowing figures are IFS estimates, and the IFS cautions that in such a volatile environment its forecasts are exceptionally uncertain. The chancellor builds his plans on the OBR's forecast, and the OBR may reach a quite different conclusion [14]. That bears on timing. If Healey settles the spending question in the 28 October Budget [4], he settles it on one forecast. According to the BBC report, he may instead put off spending decisions until the Spring Statement or Spending Review next year, when the economic outlook could have changed substantially [3]. The Treasury declined to comment on "rumour and speculation" [15].
We think the evidence supports planning for a tighter 2029-30 and not much more. The report does not say which taxes would rise or in which Budget. The IFS said that finding the extra £25bn [1], before any increase in defence spending, would point to significant tax rises [2]. It expects any "breathing space" help for households to be temporary and limited in scale [16].
What to watch
- The OBR's forecast for the 28 October Budget, and whether its headroom and departmental inflation figures sit near the IFS's £20bn and £25bn.
- Whether the Budget sets departmental spending totals or leaves them to next year's Spring Statement or Spending Review.
- Any decision to raise defence spending, which the IFS's £25bn estimate does not include.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence45
- Adoption
- Insufficient
- Hype gap+5
- Incentives
- Insufficient
- Confidence50
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
The IFS reckons that to maintain departments' budgets in the face of higher inflation, the government may need to find an extra £25bn in 2029-30.
- [2]
The £25bn figure is before considering the ambition to raise defence spending, and raising such an amount would point to significant tax rises.
- [3]
The chancellor does not have to address spending totals in this Budget and may leave such decisions until future events, for example next year's Spring Statement or Spending Review, by which time the outlook for the economy could look very different.
- [5]
The IFS expects the fiscal rules to be met by a smaller headroom of around £20bn, less than the £24bn buffer predicted at the time of the Spring Statement by the Office for Budget Responsibility.
- [6]
Like other analysts, the IFS thinks recent turbulence on bond markets and higher inflation will add around £10bn to forecasts for the government's borrowing costs in 2029-30.
- [7]
The IFS warned that the spending plans inherited from the previous chancellor, Rachel Reeves, would mean some departments' budgets would not keep pace with inflation in a few years' time.
- [8]
The IFS said that not addressing the shortfall against inflation in the inherited plans would cast doubt on the credibility of the government's plans.
- [9]
Previous chancellors have relied on a similar strategy of pencilling in unrealistic future spending plans to ensure they meet the fiscal rules on the day, only to change the plans further down the line.
- [10]
"A 'steady-as-she-goes' Budget is not an option available to the chancellor," said IFS director Helen Miller.
- [11]
"Simply pencilling in implicit cuts that he has no intention of delivering would make the Budget a work of fiction," Helen Miller added.
- [12]
The IFS still expects the government to meet its fiscal rules, not least as inflation pushes up tax revenues.
- [13]
Recent indications have been that the markets would be comfortable with the reduced degree of headroom.
- [14]
The IFS warns that in such a volatile environment its forecasts are exceptionally uncertain, and the official OBR forecast, which the chancellor relies on when making his plans, may come to a very different conclusion.
- [16]
The IFS expects any "breathing space" help for households to be temporary and limited in scale.
- [17]
Healey said his Budget "will build on this approach with fiscal discipline helping to deliver economic resilience" and give people "breathing space".
- [18]
Although higher inflation will boost tax revenues, it will also eat into the value of departments' cash budgets, the IFS said.
- [19]
The government is under growing pressure to show financial markets that it has a tight grip on finances as the cost of borrowing rises.
- [20]
The IFS's £25bn estimate to maintain departmental budgets exceeds its roughly £20bn headroom estimate by about £5bn.
Sources
1 independent publisher whose own reporting we read for this story.
- bbc.co.ukIran war threatens Healey's Budget plans, think tank warns
1 article · October 11, 2026
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- Institute for Fiscal StudiesFollow
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- Office for Budget ResponsibilityFollow
- HM TreasuryFollow