UK Chancellor Rachel Reeves may increase revenues with a windfall tax on commercial banks, focusing on profits from taxpayer-funded deposits at the Bank of England. The Institute for Public Policy Research estimates this could generate £32.3 billion over the current five-year parliament, providing Reeves with an additional £3.6 billion in fiscal space.
The think tank also recommends the Bank of England stop active gilt sales. This measure, they assert, could save over £10 billion yearly and reduce interest costs by £1.1 billion in 2029-30.
Government Revenue Strategies
The UK government is exploring various strategies to increase revenue.
The prospect of a windfall tax on commercial banks introduces significant downside risk for the UK financial sector. Traders should consider buying put options on major UK banks like Barclays and Lloyds, as well as on the broader FTSE 100 index. This move would serve as a hedge against the market’s negative reaction to a sudden drop in banking profitability.
This potential tax comes as no surprise, given that we saw banks report very strong net interest margins in their Q2 2025 earnings, a direct result of the higher rate environment that began in the early 2020s. These profits make the sector a clear target for a government seeking to raise funds, especially with the UK’s debt-to-GDP ratio recently reported by the OBR to be hovering just under 100%. The political pressure to act is mounting, increasing the probability of this tax being implemented before the next budget.
Potential Policy Shift
Furthermore, the suggestion that the Bank of England could halt its gilt sales (quantitative tightening) signals a major potential policy shift. This would likely push UK government bond prices higher and yields lower, so traders should look at buying long-dated gilt futures. We could also see increased activity in interest rate swaps, with more market participants positioning to receive a fixed rate in anticipation of a more dovish central bank stance.
Such a pivot from the Bank of England would almost certainly weaken the British pound. A halt to gilt sales would make UK assets less attractive to foreign investors seeking higher yields, putting downward pressure on sterling. Consequently, we should be prepared to see traders shorting GBP/USD futures or buying options that profit from a fall in the currency.
Overall, the combination of these fiscal and monetary policy debates creates a landscape of high uncertainty. The FTSE 100 Volatility Index (VFTSE) has already ticked up over the past week to 18.5, reflecting this nervousness around government and central bank intentions. In this environment, strategies like buying straddles on bank stocks could be effective, allowing traders to profit from a large price swing in either direction once a final decision is announced.
