UK tax reform pressure grows as IMF warns room for further rises is narrowing

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UK tax reform IMF warning

Highlights

IMF warns UK's tax space is constrained, with government revenues as a share of GDP nearly matching the EU average after threshold freezes and rises since 2024.
UK tax structure faces criticism for complexity and steep marginal rates, as high income taxes and benefit withdrawals discourage work compared to EU peers.
IMF and OBR caution that further tax hikes without structural reform will harm growth, while Labour's 2024 manifesto limits rate increases, restricting revenue options to politically sensitive or inefficient measures.

IMF warning sharpens focus on tax structure

As reported by the Financial Times, the IMF and the UK’s fiscal watchdog are warning that Britain has limited scope to keep lifting taxes unless broader reform accompanies any further increases.

Rodrigo Valdés, director of the IMF’s fiscal affairs department, says tax space appears constrained unless fundamental changes are made to the system. New IMF data shows the gap between UK and EU government revenues as a share of GDP has narrowed to its smallest on record this year, after a freeze on income tax thresholds since 2022 and a series of tax increases since 2024 push the overall burden toward a record postwar high.

The UK still collects less tax overall than countries such as France, Germany and Italy relative to the size of its economy, according to OECD figures. But economists argue the bigger weakness lies in design, with the country ranking poorly on tax complexity, work incentives and the use of exemptions and reliefs, particularly in areas such as VAT and property taxation.

Analysts cited in the report say Britain combines relatively high income tax rates for many earners with unusual tax cliffs, including the withdrawal of childcare benefits and the loss of the personal allowance above certain income thresholds. Those features can create steep marginal rates that discourage additional work, even as social security contributions remain lower than in many comparable economies.

Political constraints complicate revenue options

The IMF says raising rates further in several areas carries growing economic costs. VAT is already above the OECD average at 20 per cent, while efforts to tax capital more heavily are seen as sensitive to avoidance if assets move across jurisdictions.

The fund also warns that further increases in taxes on labour risk triggering stronger supply-side effects as workers adjust behaviour. The Office for Budget Responsibility has issued a similar message, arguing that higher rates within an otherwise unchanged framework can create distortions that damage the wider economy.

Political commitments are adding to the constraint. Labour’s 2024 election manifesto rules out higher taxes on working people through National Insurance, income tax or VAT, and also removes increases in corporation tax beyond the current 25 per cent from consideration.

That leaves ministers relying on narrower measures to raise revenue, a strategy tax specialists describe as less efficient and more complex. Economists and institutions including the IMF instead point to deeper structural changes, such as broadening the VAT base by cutting exemptions and reduced rates, or replacing Council Tax with a recurrent property levy based on updated valuations, though such proposals have long proved politically difficult.

In our earlier article on Chancellor John Healey’s IMF-backed deficit-reduction stance ahead of the October 28 Budget, we explained how the government is signalling tighter fiscal discipline while trying to preserve room for growth support. We also highlighted the modest 0.1% rise in August GDP and the intensifying political pressure to go beyond simple deficit cutting and address structural distortions that affect incentives and longer-term growth.

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