Jamie Dimon, the boss of JP Morgan (the world's largest bank), has warned UK Prime Minister Andy Burnham against raising taxes on banks. He said he did not know what he would do about the bank's planned £3 billion new headquarters in London's Canary Wharf district if the government went ahead with the tax increase. 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.

Dimon has been making this point for months. 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 unfriendly to banks Bloomberg. Starmer has since been replaced by Burnham, the UK's seventh prime minister The Telegraph. On the July podcast, Dimon repeated the warning in deliberately uncertain terms, saying he did not know what he would do about the 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 on the matter Financial Times. CityAM confirmed that Dimon cast doubt over the London tower plans while issuing the tax warning 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 as JP Morgan's UK base. It would house more than half of the bank's 23,000 UK employees The Guardian. Reuters reported it would accommodate up to 12,000 employees Reuters. Dimon approved construction in November 2025, hours after the banking industry avoided higher taxes in the then-Chancellor Rachel Reeves's autumn budget The Guardian. The timing connected the investment decision directly to the tax environment.

The tax system Dimon objects to is specific. UK banks pay a 28% corporation tax (a tax on company profits), three points above the 25% rate most companies pay. Banks also pay a separate levy based on the size of their UK operations. 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 because of the extra bank tax The Guardian.

On the other side, the Trades Union Congress (the TUC, a group that represents UK workers' unions) has said that £9 billion could be raised over four years if a previous tax cut for banks were reversed. Trade unions have been urging Burnham to tax wealth more broadly The Guardian. The Financial Times published an analysis piece on July 19, 2026 about US banks and UK tax Financial Times, showing that the clash between London's financial sector and the government's finance ministry is drawing ongoing media attention.

JP Morgan's global reach adds another layer. The bank obtained a Saudi headquarters license in October 2025, becoming the latest Wall Street firm to do so Bloomberg. Its Middle East and North Africa operations report into the London hub Bloomberg. Dimon's hope that London stays JPMorgan's European headquarters, reported by GB News, matters more given this backdrop: the bank has been steadily securing regional licenses and funnelling operations through London, and the new tower is meant to anchor that setup.

The broader picture is a standoff between a new government under pressure to raise money and satisfy organised labour, and the world's biggest bank deciding whether to invest £3bn in the country based largely on the tax regime. Dimon's language has escalated from a conditional threat in May to a stated inability to commit in July. The tower is not just office space; it is a physical sign of JP Morgan's long-term commitment to London, and pulling it would send a message far beyond the construction industry. Whether Burnham's government treats Dimon's warnings as a real constraint on tax policy or as corporate bluffing before a budget announcement will shape the next phase of the relationship between the City and a Labour government under new leadership.