A List That Did Not Exist Before
The £3.6bn wealthy tax gap is often read as money sitting somewhere, waiting to be collected, as though it were a receipt the treasury has misplaced. What it actually describes is an estimate: the distance between the tax that ought to be paid and the tax that is, calculated on a stated assumption. For the wealthy segment, that assumption is full disclosure — what rich people would owe if all of their assets were known to the tax authority. The distinction matters because a gap of this kind cannot be recovered like a debt. It can only be narrowed by making more of the underlying picture visible.
That is the background to the step HM Revenue and Customs has now taken. The UK tax authority has, for the first time, compiled a list of billionaires who are required to pay tax in the UK, regardless of whether they formally live in the country. The list runs to more than 200 names. The test is not residence. The test is a UK tax footprint, meaning the set of UK tax obligations a person actually carries, and that footprint can exist well beyond the borders of formal domicile. The authority’s stated purpose is to tackle a “wealthy tax gap” caused by those who do not pay what they ought. The novelty lies in the naming: a population long discussed as a category has become a register of individuals.
Each billionaire on that register is being allocated a dedicated customer compliance manager. The title needs explaining. Those conversations are to be offered on a voluntary basis, before the return is filed rather than after. The authority’s explanation of why the very largest fortunes get this treatment is set out in its own words:.” [2] The stated aim of meeting early is to “help build a shared understanding of the customers’ UK tax affairs and make subsequent engagement more focused and proportionate”. Both adjectives carry weight — voluntary and early — because they describe prevention rather than pursuit.
Half a Billion Against a Wider Gap
The revenue target attached to the exercise is £500m for the public purse. That number is presented as a contribution, not a total: the authority frames its actions as yielding at least £500m towards a larger commitment to raise £10bn of additional tax revenues by 2030. The announcement followed Wednesday’s budget. Half a billion is a small share of the £10bn promised by the end of the decade. The billionaire programme is therefore one slice of a revenue plan, not the plan itself.
The scale of the underlying problem is captured in one official estimate. The wealthy tax gap for 2024-25 was put at £3.6bn. That is equivalent to 6 % of the total tax gap across the UK’s entire tax-paying population. The relationship between the revenue target and the estimate is awkward rather than tidy: £500m is a fraction of the £3.6bn estimate, but the two numbers are not the same kind of object. One is a collection target for a defined programme of engagement; the other is an estimate of everything wealthy taxpayers should have paid. The authority does not claim the new managers will close that gap. It claims they will raise at least the half billion.
Scrutiny of how much the state actually knows about this population is not new. In July 2025, MPs on the parliamentary public accounts committee questioned the authority over its lack of understanding of tax compliance by about 1.3 million wealthy taxpayers. [1] The charge was a lack of understanding of how that population complies. A register of 200 billionaires with named relationship managers answers that charge in a different currency than a statistical estimate does, whatever its eventual yield. What can be said is that the two now sit in the same file.
The Threshold Bites Far Below Billions
The population inside the new machinery is fixed by two thresholds and a lookback. Wealthy individuals are defined as those with income of more than £200,000, or assets over £2m, in any of the last three years. The ‘or’ matters: one strong year is enough to pull a person inside the definition, and the test mixes a flow of income with a stock of assets that may include property. Neither figure is anywhere near billionaire territory. The billionaire list is the visible tip; the analytical machinery announced alongside it points at a group whose entry ticket is a senior salary or a balance sheet that grew.
The instrument being added is analytical rather than human. The authority plans to deploy “advanced analytics, automated triggers and artificial intelligence (AI) to identify emerging risks earlier and target compliance activity where it will have greatest impact”. [2] Translated out of administrative prose, that means risk sorting: cases are ranked before anyone writes a letter, and attention goes where the expected return is highest. The advertised benefit is timing — risks spotted while they are emerging rather than reconstructed years afterwards.
The practical consequence reaches far past the two hundred names. Adam Craggs, the head of tax, investigations and financial crime at the law firm RPC, said anyone with more than £200,000 of annual income, or net assets above £2m, should now “reflect on how clearly they understand and can evidence their UK tax position and their interaction with HMRC”. [2] The advice is procedural, and that is what makes it worth passing on. The question shifts from whether a position is defensible in principle to whether the evidence to support it exists in a folder. Two hundred billionaires, each with a named manager and a file, is less a weapon than a filing system — an attempt to bring the largest private balance sheets in Britain into view of the state.
Sources
- Public Accounts Committee — Quote source (original article)
- Guardian — Quote source (original article)