Economists Gabriel Zucman and Ben Tippet have authored a study proposing a 2% minimum tax on UK households holding more than £100 million in wealth, a measure they estimate would raise approximately £10 billion per year and affect fewer than 1,000 households. The Guardian, which reported on the study on July 21, 2026, describes Zucman as "the architect of the global wealth-tax movement." Zucman is a professor of economics at the Paris School of Economics and at the University of California, Berkeley; Tippet is a lecturer in economics and wealth inequality at King's College London.

The proposal arrives in a political moment where a wealth tax on the super-rich has moved from academic circles into active political circulation. Andy Burnham refused to rule out imposing a wealth tax, stating that people with assets over £10 million could be taxed to raise £10 billion a year. The Times and Sunday Times, via Facebook That figure mirrors the revenue estimate in the Zucman-Tippet study, though Burnham's threshold of £10 million is significantly lower than the £100 million threshold the study proposes. On July 20, 2026, it was reported that Burnham's chief political strategist had lobbied for a 2% annual wealth tax on assets over £10 million, which could raise an additional £10 billion. The Telegraph, via Facebook Neil Kinnock told Burnham to "Be audacious," as reported by Sky News. Sky News, via Facebook Unite, the UK trade union, has called for a 1% wealth tax on the super-rich, and Scottish Greens leadership contender Ross Greer has also called for a wealth tax on the super-rich.

The Zucman-Tippet study stakes its claim on administrative precision. Under the proposal, HMRC would calculate the accumulated wealth of the UK's richest families, including property, private businesses, pension wealth, art, land, and charitable assets under their control. The study includes a rule requiring rich families to pay the wealth tax for at least 10 years after leaving the UK, designed to prevent avoidance through relocation. The study states its objective as "a focused tax on extreme wealth that can make billionaires pay the same tax rates as the rest, raise meaningful revenues and dampen runaway inequality." Zucman argues that given the small number of households affected, "the UK government could implement this quickly." Tippet contends that the standard criticisms of wealth taxes — administrative complexity, asset valuation, liquidity constraints, and impacts on entrepreneurs — "do not hold" for this targeted proposal.

The broader context here involves the internationalization of Zucman's wealth-tax agenda. A Paris School of Economics publication on the Brazil G20 references Zucman's proposal for a 2% minimum tax on global billionaires' wealth, placing the UK study within a framework that has already reached G20 deliberations. The UK proposal narrows the global billionaires' concept to households above £100 million, a threshold that captures the apex of the UK wealth distribution while limiting the administrative surface area. Tippet's prior research at King's College London tracked every family on the Sunday Times Rich List from 1994 to 2025, and is described on his KCL profile as "the first dynamic analysis of a wealth tax on the UK wealth." King's College London That longitudinal work underpins the dynamic revenue modeling in the current study.

The convergence of the Zucman-Tippet study with Burnham's public positioning and his strategist's lobbying creates a novel alignment between academic tax design and a political figure who could plausibly seek national office. The £10 billion revenue figure appears across multiple strands — the study, Burnham's own statements, and his strategist's proposal — but the thresholds differ materially, with the academic proposal setting the bar at £100 million and the political proposals using £10 million. That gap matters enormously in practice: a £10 million threshold would capture vastly more households than the fewer-than-1,000 envisaged by Zucman and Tippet, with correspondingly greater administrative and political complexity. Tippet's argument that standard objections "do not hold" for a proposal targeting under 1,000 households would not necessarily transfer to a broader £10 million threshold, where valuation disputes, liquidity issues, and behavioural responses would scale up.

The 10-year exit rule also warrants attention. Exit taxes of this kind are rare in practice and raise questions about enforceability, particularly for individuals with multi-jurisdictional asset structures. The study's proposal that HMRC itself calculate household wealth — rather than relying on self-assessment — represents a significant departure from standard UK tax administration, where self-assessment is the norm. It shifts the valuation burden and risk onto the state, which may strengthen compliance but would require substantial new HMRC capacity for a function it does not currently perform at this scale.

The original publisher, journal, or institutional venue where the Zucman-Tippet study was first presented has not been identified in The Guardian's reporting. The Guardian Zucman's personal academic site hosts a PDF file dated March 26, 2026, from a publication first published in Great Britain in 2026 by a publisher whose name begins with "Basic," suggesting a forthcoming or recently released book-length treatment of these themes. His site also lists courses titled "Wealth, Tax, and Democracy" and "Public Economics" scheduled for Fall 2026 at ENS-PSL and PSE respectively.

What remains unresolved is whether the political momentum behind a UK wealth tax will coalesce around the narrow, academically modeled version or expand to the broader threshold that Burnham and his strategist have floated. The difference between taxing 1,000 households and taxing everyone above £10 million is the difference between a surgical instrument and a structural fiscal change — and the arguments that sustain one may not sustain the other.