Environment and Energy 7 min read

Unions demand bank windfall tax to slash household energy bills

Published on September 26, 2026

The financial projections provided by the TUC suggest that even a modest adjustment to the surcharge could yield significant revenue for the Treasury. Restoring the surcharge to its previous level of 8% could raise approximately £9 billion. However, the unions are advocating for a more substantial intervention. They estimate that increasing the surcharge to 16% could generate around £24 billion over a four-year period. In a more radical scenario, the TUC suggests that a 35% surcharge could raise as much as £60 billion, providing a massive capital injection that could not only fund the social tariff but also potentially support wider energy efficiency and infrastructure projects.

Paul Nowak, the General Secretary of the TUC, has been vocal in his criticism of the current situation, describing the impact of energy costs as "crushing" for households across the country. He noted that the reality for many families is a choice between falling into deep debt or living without essential utilities. In his view, the disparity between the financial hardship of ordinary citizens and the "enormous profits" of the banking sector is a political choice that the Labour government must now address. Nowak’s message to the government is clear: the social tariff should be a cornerstone of Labour’s economic policy, and the banking sector is the most equitable source of funding for such a measure.

The timing of this demand is politically significant. As Labour holds its conference, the party is under intense scrutiny from its traditional trade union allies. While the government has introduced various measures to mitigate energy costs, the unions argue that these do not go far enough to provide long-term security. There is a growing sense of urgency as the country moves toward the winter months, a period when energy consumption typically spikes and the financial burden on low-income households becomes most acute.

The TUC’s argument is rooted in the belief that the current market mechanisms are failing to protect the public. The fact that energy debt has surpassed the £5 billion mark is seen as a systemic failure rather than a temporary fluctuation. By proposing a social tariff, the unions are calling for a fundamental shift in how essential services are priced and subsidized. They argue that energy should be treated as a basic right, and its cost should not be allowed to drive millions of people into poverty.

The banking sector, however, is likely to resist any significant increase in the corporation tax surcharge. Industry representatives have previously argued that higher taxes on banks could undermine the competitiveness of the UK’s financial services sector and lead to reduced investment. Yet, the TUC maintains that the current profit margins in the banking industry are a result of broader economic conditions, including higher interest rates, and that it is only fair for these windfall gains to be used to support the wider public during a cost-of-living crisis.

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