UK Chancellor Rachel Reeves faces a considerable fiscal challenge in her upcoming Budget, with economists warning she may need to find as much as £42 billion to avoid what has been described as a ‘limping’ progression to the next fiscal update. The Institute for Fiscal Studies (IFS) has urged Reeves to eschew minimal adjustments and instead adopt a bold and comprehensive approach to fiscal policy. This call comes amid rising borrowing costs, weaker growth forecasts, and additional spending commitments made since the Spring, which could require her to secure at least £22 billion just to restore the fiscal ‘headroom’ or buffer she left herself in the last Budget.

The IFS’s analysis reveals that the existing £10 billion fiscal cushion is insufficient to shield government finances against routine economic fluctuations. Helen Miller, director of the IFS, emphasised the need for a more substantial buffer to reduce fiscal uncertainty, warning that relying on small margins invites ongoing forecast revisions and policy shifts that can damage economic confidence. Miller noted that the Chancellor’s predicament is partly self-inflicted given the minimal headroom set previously, which naturally leaves little room for manoeuvre as forecast assumptions evolve.

Additional economic analysis included in the IFS’s annual green budget, which offers a pre-Budget assessment, highlights further difficulties ahead. Barclays forecast unemployment could rise to 5 percent in 2026 due to slowing growth and persistently high inflation. Jack Meaning, Barclays’ chief UK economist, stressed the importance of prudent policy choices to avoid inflationary pressures from the Budget. Meaning underscored that with the right measures, inflation could ease, potentially enabling the Bank of England to reduce interest rates and support balanced economic growth.

Despite these warnings, Chancellor Reeves faces political constraints that complicate swift and sweeping fiscal action. Labour’s manifesto explicitly rules out increases in income tax, national insurance, or VAT, limiting the scope for traditional tax hikes. The IFS suggests that while tax rises and spending cuts represent a straightforward route to fiscal consolidation, such moves would be politically challenging—particularly spending reductions, which have also been curtailed by internal party opposition. The IFS advises against extracting large amounts from a narrow taxpayer base and instead promotes reforming the tax system to be more rational and growth-friendly.

Specifically, the IFS advocates for structural tax reforms over mere rate increases, recommending substantial changes to wealth-related taxes such as capital gains tax and property taxation. Ideas include shifting property tax burdens toward regions with higher house price growth, like London, and abolishing stamp duty. Such measures, the IFS argues, could raise necessary revenue without deterring economic activity or disproportionately penalising broader income groups. The think tank explicitly opposes an annual wealth tax despite some support within the Labour Party.

In addition to tax reform discussions, broader fiscal concerns loom large. Independent economic research points to weaker-than-expected growth in 2025, with the National Institute of Economic and Social Research (NIESR) lowering its UK growth forecast from 1.5 percent to 1.2 percent amid persistent uncertainty and cost pressures. This slower growth trajectory implies reduced tax revenues, making the government’s self-imposed fiscal rules—which require debt reduction and a budget surplus—harder to meet. NIESR projects a potential cumulative shortfall of nearly £63 billion by 2029/30 relative to these rules, increasing the likelihood of future tax rises or spending cuts. Stephen Millard, interim director of NIESR, warned that the rigidity of these fiscal rules often forces politically painful fiscal adjustments twice yearly, undermining investment and growth prospects.

The Chancellor’s limited economic cushion thus leaves her vulnerable to adverse economic developments. According to IFS director Paul Johnson, if forecast assumptions worsen, further tax rises in the Autumn Budget may become inevitable. Reeves’s Spending Review has already revealed pressures such as additional funds needed for defence and funding reversals like the reinstatement of winter fuel payments, squeezing the budget further.

Overall, the consensus among fiscal experts stresses that incremental, short-term fixes will perpetuate a cycle of fiscal instability dubbed a ‘fiscal groundhog day.’ The IFS urges Chancellor Reeves to build a larger fiscal headroom to provide greater certainty and stability while undertaking bold tax reforms that promote sustainable growth without resorting to politically fraught broad-based tax increases or large spending cuts.

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Source: Noah Wire Services