Tax rise threat to London in Chancellor John Healey's first Budget laid out by top economists

The Chancellor faces a difficult trade-off in the October 28 Budget. He can raise taxes, reduce welfare spending, or accept significant cuts to public services. The choice matters because existing spending plans are already under pressure from higher inflation and defence commitments.

The Institute for Fiscal Studies estimates that avoiding cuts could require about £25 billion more for day-to-day and investment spending in 2030–31. Raising defence spending to 3% of GDP would add roughly £11 billion. Together, these pressures help explain the possible £35 billion tax or benefit adjustment.

A steady Budget would leave departments exposed to inflation and could reduce the quantity or quality of services. Tax rises could target banks, higher earners, or property owners. Benefit cuts are politically difficult because Labour MPs have already rejected cuts on that scale. Healey must choose before setting the government’s next financial course.

Fiscal headroom is the amount of room the government has between its planned finances and the limits it aims to meet. It acts as a cushion for unexpected costs or policy choices. More headroom gives a chancellor greater flexibility; less leaves fewer safe options before taxes, benefits, or services must change.

The IFS estimates that higher inflation will increase government borrowing costs by around £10 billion in 2029–30. Inflation also raises wages, which should increase tax receipts, and may raise revenue by more than the extra welfare bill. However, the overall improvement is still weaker than expected.

As a result, headroom could fall to about £20 billion in 2029–30, from the £24 billion forecast in March. That smaller cushion makes the Budget more vulnerable to rising costs. It also increases pressure to raise taxes, reduce benefits, or top up departmental spending.

The public finances face several separate pressures at once. Higher inflation could add around £10 billion to government borrowing costs in 2029–30. Departments may also need about £25 billion more in 2030–31 to protect day-to-day services and investment from inflation-driven cuts.

Defence adds another major cost. Increasing defence spending to 3% of GDP by 2030 is estimated to require roughly £11 billion in 2030–31. The £25 billion figure covers a spending top-up, while the £11 billion figure covers the higher defence target, so they describe different pressures rather than one single bill.

The IFS says funding higher spending and avoiding service cuts could require tax rises or benefit cuts of around £35 billion. The figures show why the Chancellor faces limited room for manoeuvre. Delaying decisions could leave departments absorbing inflation through reduced services or investment.

Inflation affects both sides of the government’s finances. When prices and wages rise, the government may have to pay more to service borrowing, especially where debt costs respond to inflation or interest rates. The IFS estimates that this could cost around £10 billion in 2029–30.

At the same time, higher wages increase the cash value of earnings. If tax rates stay unchanged, larger pay packets can produce more income-tax and other payroll-related revenue. The article says this extra revenue will probably exceed the increase in the welfare bill, because benefits also become more expensive as living costs rise.

The two effects do not cancel out fully. The expected revenue gain is not enough to preserve the earlier fiscal cushion. Therefore, headroom could fall from £24 billion to about £20 billion in 2029–30. Higher inflation still leaves the government with less room for spending decisions.

The government has three broad ways to close the gap. It can increase taxes, reduce welfare payments, or cut departmental spending. The IFS says that funding higher spending while avoiding public-service cuts could require tax rises or benefit cuts of around £35 billion.

Possible tax measures include higher levies on banks, larger contributions from better-off people, and a bigger Treasury cash grab from property owners. Alternatively, the government could reduce benefits. However, the article says welfare cuts on this scale have already been rejected by Labour MPs.

The final option is to accept cuts in public services. That could happen if the Chancellor keeps inherited tax and spending plans unchanged. The IFS warns this would allow inflation to erode departments’ budgets and lead to “chunky cuts” in service quantity or quality. Each route carries political and practical costs.

The proposed tax increases are aimed at groups and assets that are especially prominent in London. The capital has a major concentration of banks and financial activity, many high-paid workers, and expensive property. That means taxes on these areas would likely collect a large share of their money there. This explains the article’s warning that tax rises would almost certainly hit London hardest.

For example, a higher bank levy would directly affect the City’s financial institutions. Higher taxes on better-off people would reach more taxpayers where high incomes are concentrated. A larger property tax take would also matter more where property values and ownership costs are high.

The regional impact could become politically important. London households and businesses might bear more of the adjustment than elsewhere, while the government tries to protect public services. The article presents these measures as options being considered, not confirmed Budget decisions.

A government funds its commitments mainly through tax revenue and borrowing. Taxes collect money from households and businesses. Borrowing supplies additional funds when planned spending is greater than current revenue, but it creates future interest and repayment costs. Spending decisions determine how that money is divided among public services, welfare payments, and defence.

In this case, higher inflation affects both sides. It can increase tax receipts as wages rise, but it can also make government borrowing and public services more expensive. The government may therefore need to choose between raising taxes, cutting benefits, or reducing departmental budgets. Defence spending competes with health and other services for the same overall resources.

The article says avoiding cuts could require around £35 billion in tax rises or benefit reductions. If no changes are made, departments may face “chunky cuts.” This shows how funding choices connect: protecting one area can require more revenue, less spending elsewhere, or more borrowing.