Banks Warn UK Windfall Tax Would Push Investment Away

Global banking executives have warned that raising taxes on the sector will push investment away from the UK, a threat that could further erode London’s position as a financial centre. The warning comes as Chancellor John Healey prepares next month’s Budget and looks for revenue to compensate for higher borrowing costs driven by the Iran war. Senior bankers said the UK would no longer be their automatic choice as a main European hub in the way it was before Brexit, according to a survey of US, EU, Asian, African and Middle Eastern lenders with large British operations conducted by UK Finance, the sector’s main lobby group.

The survey’s findings reflect a growing unease among international banks that a windfall tax is imminent. The government is under fiscal pressure, and the banking sector is seen as a politically convenient source of revenue. But the industry’s response is pointed: further taxation risks crossing a threshold that would make the UK a less attractive base for global operations. David Postings, chief executive of UK Finance, put the stakes plainly. “I think already we’re very highly taxed,” he said. “To go further than that, really I think would reach a tipping point and would be very risky on the part of the government.”

Bankers identified two distinct scenarios that would trigger a serious reassessment of their UK operations. The first is an increase in tax and regulatory burdens, which would directly raise the cost of doing business in London relative to rival centres. The second is stricter immigration rules that make it harder to move staff into Britain. Both factors touch on the core appeal of London as a financial hub: its ability to attract capital and talent from across the world with relative ease. Any erosion of that appeal, bankers argue, would accelerate the gradual dispersal of activity to other European centres that has been underway since Brexit.

The warning is significant because it is not hypothetical. The UK banking sector already operates under a heavy tax load, including corporation tax and the bank surcharge, and regulatory costs have risen steadily since the financial crisis. A windfall tax would sit on top of that existing burden, and the industry’s message is that the cumulative effect matters more than any single levy. The government faces a genuine trade-off: near-term revenue from a windfall tax could come at the expense of long-term competitiveness, as banks make location decisions on a multi-year horizon and choose where to book profits, locate senior staff, and base their European operations.

The immigration dimension adds a further layer of complexity. Post-Brexit rules have already made it more cumbersome to transfer employees into the UK, and bankers say any tightening would compound the problem. The ability to move staff quickly and flexibly is central to how global banks manage their operations, and friction on that front is a competitive disadvantage that tax policy could make worse. The two scenarios are linked: a bank weighing whether to keep its European hub in London is assessing the full package of costs, including tax, regulation, and the ease of moving people.

For the government, the immediate fiscal need is real, but the warning from the sector suggests the price of meeting that need may be paid in a different currency. London remains one of the world’s leading financial centres, but its position is not immutable. The banks’ message is that the UK’s status is conditional on the overall environment remaining competitive, and that a windfall tax, combined with tighter immigration rules, could tip the balance. The question for policymakers is whether the revenue gained in the next Budget is worth the investment that may be lost in the years that follow.

The broader takeaway is that the UK’s financial centre is being tested on multiple fronts at once. The banks are not threatening to leave overnight, but they are signalling that the decisions made in the coming months will shape where the next wave of investment lands. For a government seeking revenue, the sector’s warning is a reminder that the most expensive tax is the one that drives activity elsewhere.