JPMorgan Chase CEO Jamie Dimon has delivered a blunt warning to UK Chancellor John Healey, cautioning against any increase in taxes on banks as the government prepares its budget for October. During a phone call last week, Dimon argued that higher taxes often drive away financial sector jobs, citing the decline in finance employment in New York as a cautionary tale. He blamed a portion of that decline on the city's tax burden, according to individuals familiar with the conversation who spoke on condition of anonymity.

The call comes at a sensitive moment for Prime Minister Andy Burnham's administration, which faces mounting pressure from organized labor and other groups to raise levies on lenders, given the banking industry's robust profits in recent years. Burnham has signaled that the budget could include measures to increase taxes on banks, though no final decisions have been made.

Dimon's concerns are not new. In recent weeks, he has repeatedly criticized the UK's bank tax surcharge, a levy imposed on lenders' profits. Speaking on the Master Investor Podcast with Wilfred Frost on July 16, Dimon warned that an uncompetitive tax system would drive capital away. "If you have a uncompetitive tax system, capital leaves your country," he said, emphasizing that the financial industry is highly mobile and tax policies can significantly influence where banks choose to base their operations and allocate resources.

The UK's banking sector has faced a series of tax changes over the past decade, including a bank surcharge introduced in 2015 and later adjusted. The current surcharge stands at 3% on profits above a certain threshold, on top of the standard corporate tax rate. Industry leaders have argued that the cumulative tax burden makes London less attractive compared to other financial hubs like New York, Singapore, and Dubai.

Dimon's intervention adds to the chorus of voices cautioning against a sharp increase in bank taxes. He pointed to New York's experience, where the finance industry lost jobs partly due to high taxes, as a warning of what could happen in the UK. However, supporters of higher taxes argue that banks have enjoyed record profits and should contribute more to public finances, especially as the government faces budget constraints and rising demands for public spending.

The FT report, which broke the news of Dimon's call, highlights the delicate balance Burnham's government must strike. On one hand, there is political pressure to tax profitable industries more heavily. On the other, there is a risk of alienating the financial sector, which is a major employer and contributor to the UK economy. The upcoming budget will be closely watched by both domestic and international investors for signs of the government's fiscal direction.

Dimon's direct engagement with the Chancellor underscores the high stakes involved. As the head of the largest US bank by assets, his views carry weight in financial circles. The outcome of this debate could shape London's competitive position as a global financial center for years to come.