Jamie Dimon, CEO of JP Morgan, has warned UK Prime Minister Andy Burnham against raising taxes on banks, saying he did not know what he would do about the bank's planned £3 billion Canary Wharf headquarters if the new government followed through. The warning came during an appearance on the Master Investor Podcast with Wilfred Frost, recorded the week before its release on July 21, 2026 The Guardian.

This is not the first time Dimon has raised the alarm. In May 2026, he told Bloomberg he could scrap plans for the £3bn tower if Keir Starmer were replaced as prime minister by a new Labour leader hostile to banks Bloomberg. Starmer has since been succeeded by Burnham, the UK's seventh prime minister The Telegraph. On the July podcast, Dimon reiterated the warning in pointedly uncertain terms: he said he did not know what he would do about the planned Canary Wharf office if Burnham's government raised taxes on banks The Guardian.

The Financial Times separately reported that Dimon warned of "consequences" if Burnham taxed banks, and pressed him on whether he had lobbied the UK government regarding bank taxes Financial Times. CityAM independently confirmed that Dimon cast doubt over the London tower plans while issuing the tax warning to Burnham's government CityAM. GB News reported that Dimon said he hoped London would remain JPMorgan's European headquarters GB News.

The tower at the centre of the dispute is a 279,000 square metre (3 million sq ft) headquarters in Canary Wharf, planned to serve as JP Morgan's UK base and house more than half of its 23,000-strong UK workforce The Guardian. Reuters reported the new tower would accommodate up to 12,000 employees Reuters. Dimon approved construction in November 2025, hours after the banking industry was spared increased taxes in then-Chancellor Rachel Reeves's autumn budget The Guardian. The timing of that approval linked the investment decision directly to the fiscal environment.

The tax structure Dimon objects to is specific. UK banks pay a 28% corporation tax rate (a tax on company profits), three points above the standard 25% rate most companies pay, plus a separate levy on their UK balance sheets — essentially an additional charge based on the size of the bank's assets in the country. Dimon said on the podcast that he had previously called the UK chancellor about the bank levy and believed it "was wrong." He stated that JP Morgan shareholders paid $5 billion on the extra bank tax The Guardian.

On the other side of the ledger, the Trades Union Congress (the TUC, an umbrella body for UK trade unions) has claimed that £9 billion could be raised over four years if the previous Conservative government's cut to the bank surcharge were reversed. Trade unions have been urging Burnham to tax wealth The Guardian. The Financial Times published a Lex column (the paper's analytical business commentary) on July 19, 2026 concerning US banks and UK tax Financial Times, signalling that the confrontation between the City (London's financial district) and the Treasury is drawing sustained editorial attention.

JP Morgan's regional footprint adds another dimension. The bank obtained a Saudi headquarters license in October 2025, becoming the latest Wall Street firm to do so Bloomberg. JPMorgan's Middle East and North Africa operations report into the London hub Bloomberg. Dimon's expression of hope that London remains the European headquarters, reported by GB News, acquires weight against this backdrop: the bank has been methodically securing regional licenses and consolidating reporting lines, and the London tower is meant to anchor that structure.

The broader context here is a confrontation between a newly installed government facing fiscal pressure and organised labour demands, and the world's biggest bank making a capital deployment decision that is publicly, almost explicitly, contingent on the tax regime. Dimon's language has escalated from a conditional threat in May to a stated inability to commit in July. The £3bn tower is not merely office space; it is a physical signal of JP Morgan's long-term commitment to London, and its potential withdrawal would carry symbolic weight well beyond the construction sector. Whether Burnham's government treats Dimon's warnings as a genuine constraint on fiscal policy or as corporate posturing ahead of a budget cycle will shape the next phase of the relationship between the City and a Labour government under new leadership.