Calls for a windfall tax on UK banks have intensified again in 2026 as major lenders report strong profits while households continue to face pressure from borrowing costs and household bills.
HSBC, NatWest, Barclays and Lloyds reported combined profits of around £29.2 billion in the first half of 2026. This has revived arguments that banks benefiting from relatively high interest rates and the Bank of England’s reserve-remuneration system could make a larger contribution to the public finances.
The debate has also moved on politically. The earlier £7 billion to £8 billion annual estimate came from an IPPR proposal published in August 2025.
In 2026, campaign group Positive Money has put forward a broader approach that it estimates could raise as much as £19 billion. No new UK bank windfall tax has yet been confirmed, making the issue an important question ahead of the 28 October 2026 Budget.
What Exactly Is a Windfall Tax?
A windfall tax is a temporary levy imposed on companies when they make unexpectedly large profits due to external conditions rather than their own efficiency or innovation. Unlike standard corporation tax, which is applied uniformly to all profits, windfall taxes focus specifically on excess gains that are seen as unearned or unfair in light of wider economic pressures.
In practice, windfall taxes are not new. Governments have turned to them at moments of crisis to rebalance wealth. In the UK, Margaret Thatcher introduced a deposit tax in 1981 that temporarily targeted bank reserves.
More recently, the Conservative government imposed a windfall tax on energy producers in 2022 after oil and gas companies benefited from soaring global prices. Internationally, countries like Spain and Hungary have also targeted banking profits to address fiscal shortfalls.
The principle is the same: when an industry benefits disproportionately from circumstances that place a burden on the public, governments intervene to redistribute some of those gains.
Why Are UK Banks Making Strong Profits in 2026?
Higher interest rates have continued to support earnings across much of the UK banking sector, although profitability now reflects more than simply the rapid rate increases seen after 2021.
As of August 2026, the Bank of England’s Bank Rate stands at 3.75%. The Monetary Policy Committee voted to keep it unchanged at its July meeting, with three members preferring an increase to 4%.
Meanwhile, HSBC, NatWest, Barclays and Lloyds reported approximately £29.2 billion in combined profits during the first half of 2026. HSBC alone reported around £7.5 billion of profit for the second quarter.
Strong net interest income, fees and other banking activities have therefore kept the debate over additional taxation alive, although banks argue their profits also support lending, investment, dividends and pension savings.
How Does Quantitative Easing Connect to the Debate?
Quantitative easing, or QE, was introduced by the Bank of England as a response to the global financial crisis and later expanded during the pandemic. The aim was to stimulate the economy by purchasing government bonds, injecting liquidity into financial markets, and lowering borrowing costs.
Initially, QE generated profits for the Bank of England. However, as interest rates began to rise after 2021, the programme turned into a significant cost. The Bank must pay higher interest on reserves held by commercial banks, and the Treasury is legally committed to covering these losses.
The fiscal cost remains substantial, but the £22 billion-a-year figure comes from the IPPR’s August 2025 analysis and should no longer be presented as the latest official estimate.
The Office for Budget Responsibility’s 2026 forecast projects around £15.5 billion of Treasury cash transfers to the Bank of England’s Asset Purchase Facility in 2026/27.
Of this, around £6 billion is forecast to relate to APF interest losses, with the remainder largely reflecting valuation losses as gilts are sold or mature.
This distinction matters because the cost of QE and QT varies with Bank Rate, gilt prices, maturities and the speed at which the Bank of England reduces its bond holdings.
For critics, this is a double injustice. Taxpayers are footing the bill for QE losses while banks, shielded from risk, are benefitting disproportionately. This context has fuelled the argument for a windfall tax.
How Much Could a Windfall Tax on Banks Raise?
There is no single agreed figure because different proposals would tax banks in different ways.
The IPPR’s August 2025 proposal focused specifically on income connected with reserves held at the Bank of England. It estimated that a QE reserves income levy could raise around £7 billion to £8 billion a year, with the amount declining over time as QE-related reserves fall.
A newer 2026 proposal from Positive Money is much broader. Following strong first-half results from Britain’s largest banks, the campaign group estimated that its proposed windfall tax could raise up to £19 billion from HSBC, NatWest, Barclays and Lloyds.
Neither figure is an official Treasury revenue forecast, and no such windfall tax has yet been confirmed.
Quantitative tightening is also continuing. The Bank of England plans to reduce its stock of APF gilts by £70 billion between October 2025 and September 2026. Holdings stood at approximately £521.8 billion at the end of June 2026, with the programme expected to bring them down to £488 billion by September.
| Proposal Or Measure | Latest Position |
|---|---|
| IPPR QE Reserves Income Levy | Estimated £7bn–£8bn annually under the 2025 proposal |
| Broader 2026 Bank Windfall Tax Proposal | Campaign estimate of up to £19bn |
| Current Bank Of England QT Programme | £70bn reduction targeted by September 2026 |
| APF Gilt Holdings At End Of June 2026 | Approximately £521.8bn |
What Could a Bank Windfall Tax Look Like in Practice?
There are now several competing ideas rather than one agreed design.
The IPPR proposal from 2025 called for a temporary QE reserves income levy targeting income that larger commercial banks receive in connection with reserves created through quantitative easing. IPPR estimated that this approach could initially raise around £7 billion to £8 billion annually.
A separate 2026 proposal from Positive Money advocates a broader windfall tax linked more directly to bank earnings and estimates considerably higher potential revenue.
These remain proposals rather than enacted UK tax policy. Banks already pay normal corporation tax alongside the banking surcharge, which remains at 3% on qualifying profits above the £100 million group allowance, as well as the separate Bank Levy.
Any new system would therefore need the government to decide whether to target overall profits, reserve-related income or adjust one of the existing bank-specific taxes.
How Have Banks and Industry Groups Responded?
Banks and financial-sector leaders continue to oppose additional industry-specific taxation, arguing that the UK banking sector already faces corporation tax, the banking surcharge and the Bank Levy.
Their main concern is that further taxes could reduce Britain’s competitiveness, affect investment decisions and make London less attractive compared with financial centres such as New York.
Those arguments have resurfaced strongly in 2026 as calls for a windfall tax have grown. Supporters of higher taxation counter that strong bank profitability and large shareholder distributions suggest the sector could contribute more without undermining lending or financial stability.
The disagreement therefore remains centred on whether additional revenue for households and public services would outweigh possible effects on investment and UK financial-sector competitiveness.
How Do Other Countries Handle Bank Windfall Taxes?
Looking abroad provides important context. The UK is not alone in considering targeted taxes on banks. In fact, several European countries have already implemented similar measures.
- Spain introduced a levy in 2023 designed to raise around €3 billion, focused specifically on profits linked to rising interest rates.
- Italy announced a tax on banks in 2023 but scaled it back after investor concerns caused stock market volatility.
- Hungary imposed extra taxes on banks as part of a broader package to support pandemic recovery.
These examples highlight both the popularity and the controversy of windfall taxes. While they can raise significant revenue, they often face strong pushback from financial markets and industry leaders.
What Are the Arguments For and Against a Windfall Tax on UK Banks?
The debate is highly polarised.
Supporters argue that the measure would address fairness. At a time when households are struggling with rising costs, it is wrong for taxpayers to cover QE losses while banks reap windfall gains. Redirecting £8 billion a year could provide critical support to public services and households, while ensuring that banks contribute proportionately to the economic challenges facing the country.
Critics counter that the proposal risks damaging the competitiveness of Britain’s financial services sector. They argue that banks already pay more tax than most industries and that another levy could lead to unintended consequences, such as reduced lending capacity or higher costs for consumers. Critics also warn that relying on temporary windfall taxes creates fiscal uncertainty and discourages long-term investment.
Could a Windfall Tax Really Solve the UK’s Fiscal Problems?
While a windfall tax could raise substantial revenue, it is not a silver bullet for the UK’s fiscal challenges. The estimated £8 billion would help, but it must be seen in the context of wider budgetary pressures. The Treasury faces a long-term gap between spending commitments and revenue, meaning broader structural reforms may still be required.
The debate also raises deeper questions about how the UK manages its monetary and fiscal policy. If QE has created structural costs for taxpayers, then a targeted tax may be a necessary correction, but it does not address the underlying issue of policy design. This is why some economists suggest that reforms to QE itself and to the way central bank losses are handled are as important as any short-term levy.
What Might Happen to a UK Bank Windfall Tax in 2026?
A bank windfall tax has returned to the political agenda, but no new levy has been confirmed as of August 2026.
The political situation has changed significantly since the original debate. Andy Burnham became Prime Minister on 20 July 2026, while John Healey was appointed Chancellor of the Exchequer on the same date. The Chancellor has confirmed that his first Budget will take place on 28 October 2026.
Strong bank profits and renewed campaigning mean bank taxation could remain part of the debate ahead of the Budget. However, the government must balance calls for additional revenue against its wider aim of encouraging lending, business investment and economic growth.
Until the Treasury announces an actual policy, figures such as £8 billion or £19 billion should therefore be described as estimates from campaigners or think tanks rather than expected government revenue.
Conclusion
The debate over a windfall tax on UK banks remains highly relevant in 2026, but the numbers and political circumstances have changed. The original IPPR proposal estimated that a QE reserves income levy could raise around £7 billion to £8 billion annually, while a broader 2026 campaign proposal has put the potential figure as high as £19 billion.
At the same time, official forecasts show that the fiscal costs associated with the Bank of England’s Asset Purchase Facility remain significant, while major UK banks continue to report strong profits.
However, a new bank windfall tax has not yet been confirmed. With John Healey’s first Budget scheduled for 28 October 2026, the question is now whether the government will pursue additional bank taxation or prioritise financial-sector competitiveness, lending and investment. Until a formal policy is announced, the £8 billion and £19 billion figures should be treated as proposal-based estimates rather than guaranteed Treasury revenue.
FAQs on Windfall Tax on UK Banks
Has the UK introduced a bank windfall tax in 2026?
No. As of August 2026, additional taxation of bank profits is being debated, but no new UK bank windfall tax has been confirmed.
Could a bank windfall tax raise £8 billion?
Yes, according to the IPPR’s 2025 modelling, its proposed QE reserves income levy could initially raise around £7 billion to £8 billion a year.
Why is £19 billion now being discussed?
Positive Money estimated in 2026 that a broader windfall tax on the four largest UK banks could raise up to £19 billion. This is a campaign estimate, not an official Treasury forecast.
How much are the UK’s biggest banks making?
HSBC, Barclays, Lloyds and NatWest reported combined profits of approximately £29.2 billion during the first half of 2026.
What is the Bank of England’s current interest rate?
Bank Rate is 3.75% following the Monetary Policy Committee’s decision on 30 July 2026. The next scheduled decision is 17 September 2026.
Do UK banks already pay additional taxes?
Yes. Banks can face the standard corporation tax, a 3% banking surcharge on qualifying profits above the applicable allowance, and the separate Bank Levy.
When could there be more clarity on a bank windfall tax?
The next major fiscal event is Chancellor John Healey’s Budget on 28 October 2026, although there is currently no guarantee that it will contain a new bank windfall tax.
