The Chancellor’s room for manoeuvre ahead of the 28 October Budget has been substantially reduced by higher government borrowing costs, according to the Resolution Foundation, which estimates that headroom against the government’s principal fiscal rule has fallen from £24bn to £12bn.
In its new report, Hitting the buffers, published on 13 October, the think tank argues that conflict in the Middle East and renewed inflationary pressure have altered the fiscal outlook despite relatively resilient UK economic growth. It estimates that higher debt interest costs will add around £14bn to annual borrowing in 2029–30 compared with the forecast made in March.
The headroom estimate is the foundation’s projection rather than an updated official forecast from the Office for Budget Responsibility. It reflects the organisation’s assessment of how market conditions and other developments could change the government’s ability to meet its fiscal commitments. The OBR’s own forecast will accompany the Budget.
The squeeze comes at a difficult point for public spending decisions. Inflation erodes the real value of spending settlements, while higher debt-service costs reduce the funds available to other priorities. Relief for households facing larger bills would add to the immediate requirement unless matched by spending changes or additional revenue.
Resolution Foundation said the economy had grown 1.1% during the first half of 2026, the strongest performance among G7 economies on its comparison. Growth has therefore provided some support even as the inflation and interest-rate backdrop has worsened. Growth in economic output does not necessarily translate into a larger fiscal buffer when servicing outstanding debt becomes more expensive.
The report estimates a typical family remains £2,900 worse off than it would have been had the economy followed its expected pre-pandemic path. It also says almost one in five households in the poorer half of the income distribution is behind on priority bills, illustrating why inflation can put pressure on ministers to introduce targeted support even when budgetary capacity is limited.
Rather than recommending broad measures paid for through additional borrowing, the foundation argues that short-term help should be targeted and temporary. It also advocates rebuilding fiscal headroom to at least £20bn, which it believes would require about £8bn from tax reforms combined with continued control of spending.
Tax proposals inevitably affect different business groups differently. Changes to investment incentives, business taxes, employee costs or household disposable income can alter demand and confidence in the private sector. The foundation’s suggested approach does not amount to a government announcement, but it provides a measure of the trade-offs ministers will face.
Interest rates are central to those trade-offs. Government borrowing is financed through debt securities whose yields reflect investor expectations of inflation, monetary policy and fiscal credibility. When yields rise, new borrowing generally costs more, while the effect on outstanding debt depends on maturity and refinancing schedules.
Higher government bond yields can feed through to corporate financing costs and investment appraisal, while weaker household purchasing power can affect customer demand. Decisions in the Budget may also change payroll costs, business investment incentives and pricing plans. Those potential policy effects should be separated from the projections used by the Resolution Foundation to assess the public finances.
The Resolution Foundation and the Institute for Fiscal Studies have published separate pre-Budget assessments. The foundation’s £12bn figure is its estimate of the remaining fiscal buffer, while the IFS has focused on the possible cost of maintaining departmental spending in real terms. Neither constitutes a new official forecast from the Office for Budget Responsibility.
Ministers face the Budget on 28 October with competing demands for household support, public services and sustainable borrowing. The eventual margin against the fiscal rules will depend on the official forecast and the measures the government announces. The foundation’s analysis suggests that a relatively small change in assumptions could materially alter that margin.
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