The OECD has delivered a stark message to the United Kingdom: the country’s tax system is no longer merely inefficient — it is increasingly acting as a brake on growth.
In its latest assessment of the UK economy, the OECD links the country’s sluggish GDP per capita growth to weak productivity, subdued business investment, and declining labour utilisation. But beyond these macroeconomic challenges, the organisation points to a more structural issue: the UK tax framework itself is undermining competitiveness and distorting economic behaviour.
A Tax System Burdened by Complexity and Distortions
According to the OECD, the UK tax regime has become overly complex, costly to navigate, and riddled with distortions that weaken incentives across the economy.
The report highlights that:
- Complex tax rules are driving up compliance costs and reducing tax compliance, particularly for smaller businesses
- VAT exemptions and reliefs often fail to achieve policy goals while disproportionately benefiting higher earners
- Property taxes continue to rely on outdated valuations that undermine fairness and efficiency
- Income tax thresholds and rate structures create distortions that weaken incentives to work more
- Corporate tax treatment of net interest deductions can encourage economically inefficient investment
OECD Calls for a Fundamental Tax Review
Rather than incremental adjustments, the OECD recommends a broad review of the UK tax system aimed at making it more efficient, neutral, and growth-oriented.
Its recommendations include:
Eliminate Distortive Reliefs and Loopholes
Tax expenditures and exemptions that lack a clear economic or social rationale should be removed.
Broaden the VAT Base
The OECD supports phasing out inefficient VAT exemptions and replacing them with targeted transfers for lower-income households.
Modernise Property Taxation
Revaluing property tax bases would improve fairness and better align taxation with current market realities.
Institutionalise Tax Expenditure Reviews
Regular scrutiny of tax reliefs should become standard practice to prevent unnecessary erosion of the tax base.
Tax Reform Is No Longer Optional
The OECD’s conclusion is unambiguous: tax reform is not simply a fiscal necessity — it is an economic imperative.
With public debt elevated, demographic pressures intensifying, and the UK seeking to reignite productivity and investment, maintaining an outdated and distortionary tax system risks further eroding competitiveness.
The message from the OECD is clear: without meaningful tax reform, the UK’s broader growth ambitions will remain significantly constrained.