National Contributions Tax” Explained: Burnham-Era Reform 2026

A group of senior UK economists led by Lord O’Neill of Gatley has proposed scrapping income tax, National Insurance, and capital gains, dividend and inheritance taxes in favor of a single “national contributions” levy, alongside replacing stamp duty with a 1% property valuation charge. The plan claims it could unlock £38bn in fiscal headroom and raise £18bn — and it’s landing just as Andy Burnham prepares to become prime minister.

Why this is surfacing right now

Most UK coverage has focused on the horse-race politics of Keir Starmer’s resignation and Andy Burnham’s expected succession as prime minister on July 20, 2026. What’s been under-covered is the structural tax reform proposal now sitting on the desk of whoever holds that office. Lord O’Neill and five other economists have published a report through the UCL Institute for Global Prosperity calling for a fundamental redesign of how the UK taxes income and wealth (CPA).

The mechanics: instead of stacking income tax, National Insurance, and separate levies on capital gains, dividends and inheritance, the UK would consolidate all of it into one “national contributions” tax. Stamp duty on property transactions would be replaced with an annual 1% levy on property valuations. The report’s authors argue this could create £38bn of additional fiscal headroom while raising £18bn in net new revenue — a combination that would matter enormously to a new government already facing warnings from the Office for Budget Responsibility about UK debt trajectories.

The bigger fiscal backdrop making this urgent

This isn’t a proposal floating in a vacuum. The OBR has warned that public debt could climb toward 300% of GDP by 2075 without intervention, and that nearly 50 million people could eventually fall into the higher tax bracket if current thresholds stay frozen while spending goes uncontrolled — potentially pulling even full-time workers on the National Living Wage into the 40% band by the late 2060s (CPA). The UK’s tax-to-GDP ratio is already projected to rise from 37% in 2019/20 to 43% by 2030/31.

Against that backdrop, the political calculation facing Burnham is unusually tight: he has signaled Labour’s manifesto still leaves room for maneuver on taxes, provided the party avoids raising the headline rates of income tax, VAT or National Insurance (CPA). A single consolidated levy could, in theory, let a government reshape effective tax burdens without technically breaking that pledge — which is precisely why business groups are watching this proposal so closely.

Who wins and loses under a consolidated levy

• Higher earners and investors currently benefiting from the gap between income tax rates and lower capital gains rates would likely see that gap close, which is why fintech entrepreneurs have already pushed back hard. Thought Machine founder Paul Taylor has called proposals to align capital gains tax with income tax “profoundly unfair” and warned it could discourage the investment the UK needs to support venture-backed IPOs (CPA).
• Property owners would trade a one-off stamp duty charge for an ongoing annual valuation-based levy — a structural shift with very different cash-flow implications for anyone holding property long-term versus trading it frequently.
• The Treasury gains a simpler, harder-to-avoid tax base, which is the core appeal for fiscal planners worried about long-run debt sustainability.

What UK businesses and investors should track next

Business confidence in the UK has already fallen to an 18-month low, with firms citing tax uncertainty as a leading factor, according to S&P Global data (CPA). Until the new government clarifies whether it will pursue anything resembling the national contributions model, expect continued caution on hiring and investment — a dynamic we cover in depth in our UK business confidence explainer.