UK Bank Shares: Bargain or Trap?

Eight days before the October 28 Budget, Chancellor John Healey has handed equity investors a clear signal and a sharp dilemma at the same time. Healey will not increase the UK’s tax on capital gains, relying instead on a likely rise in the surcharge tax on banks’ profits to help fund the Labour government’s plans. Capital gains tax off the table is unambiguously good news for domestic risk assets broadly. But it concentrates the fiscal burden of the Budget onto one sector, and that sector is Barclays, NatWest, Lloyds and HSBC.

The Bull Case

Start with what today’s decision actually removes. Pre-briefed speculation about aligning capital gains tax with income tax had been a live overhang for domestic equities and private capital, and ruling out a floated hike can relieve pressure on exposed names. That uncertainty is gone. For investors who had been sitting on UK equity exposure waiting to see which way Healey moved, this morning’s confirmation is a green light to re-engage.

The banks themselves are not obviously cheap, but the profit base is substantial. HSBC, NatWest, Barclays and Lloyds reported combined profit before tax of roughly £31 billion in the first half of 2026, based on their interim results. Even if the surcharge returns to 8% from 3%, KBW analysts estimate that could raise about £2 billion per year for the Treasury but slice roughly 6% off lenders’ earnings, painful, but not existential against that earnings base. Higher gilt yields can also benefit banks’ net interest income as structural hedges roll over. With 30-year gilts having moved above 6% for the first time since 1998 earlier this month, that tailwind is real.

Geography matters too. Lloyds and NatWest would likely bear the brunt of any new levy, given their near-total UK exposure. Barclays has partial exposure, while HSBC is the least affected among the major lenders. Investors who want domestic bank exposure without the full levy risk have a clear route through HSBC.

The Bear Case

The structural problem is that Healey has fewer options, not more. The decision leaves Healey with fewer revenue-raising options when he takes to the despatch box on 28 October, following his commitment to not raise VAT, national insurance or income tax. That makes the bank surcharge not a marginal revenue item but a potential centrepiece. And the pressure to make it larger is intense: the Trades Union Congress says returning the surcharge to 8% would raise about £9 billion over the next four years, and it has lobbied for 16%, which it says could raise £24 billion over the next four years.

The competitive position is already strained. UK Finance estimates the total tax rate of a model bank operating in London at 46.4%, compared with 38.9% in Frankfurt and 27.9% in New York. Another surcharge increase widens that gap further, with consequences for where international capital chooses to book business. The potential tax change has renewed concerns about the UK’s appeal as a financial centre.

The UK is not the only sovereign market where fiscal credibility is being tested in real time. France’s bond market has already shown how quickly a budget announcement can widen spreads and reprice an entire financial sector.

The macro backdrop compounds the problem. This morning’s ONS data showed vacancies recording their largest quarterly fall since the start of the year, dropping to 691,000. Outside the coronavirus pandemic period, the ONS says the last time vacancies were at 702,000 or fewer was August to October 2014. The ONS also noted that feedback from its Vacancy Survey continues to suggest smaller firms may not be recruiting because of increases in labour costs. A cooling labour market narrows the growth argument Healey is leaning on to justify sparing capital gains tax, and September CPI lands tomorrow against a gilt market already pricing in fiscal stress.

Where the Evidence Leads

The bull and bear cases here are not symmetric. Removing capital gains tax risk is a genuine positive, but it is a removal of a negative rather than a new positive catalyst. The bank surcharge, by contrast, is a concrete and growing earnings headwind. Past iterations of bank-specific levies have tended to hit domestic-focused lenders harder than the internationally diversified peer set, which means Lloyds and NatWest carry the most risk, while HSBC’s diversification provides a partial buffer.

Thirty-year gilt yields have already moved above 6%, adding to pressure on Healey before his first Budget. The headroom question matters because the OBR has repeatedly highlighted how sensitive fiscal rule headroom can be to changes in rates and gilt yields. A further gilt sell-off following tomorrow’s CPI print could tighten the fiscal arithmetic still further, giving Healey reason to push the bank surcharge higher rather than lower.

The gilt market’s move above 6% is part of a broader long-end repricing that has been building for months. The 30-year yield diverging from near-term rate expectations is the structural dynamic compressing fiscal headroom on both sides of the Atlantic.

Final Verdict

The CGT ruling is good news for UK equities broadly. For the banks specifically, it transfers risk rather than reducing it. The sector is being asked to carry a Budget that has run out of other levers, in a weakening economy, with 30-year borrowing costs above 6%, near three-decade highs. HSBC, with its international earnings mix, is the most defensible position in the group. Lloyds and NatWest look exposed until the exact surcharge figure is confirmed on October 28. The bear case for domestic UK lenders is better supported by the current evidence than the bull case, with moderate confidence, the one variable that could shift the balance is the size of the levy itself, which is not yet confirmed.