The UK’s tax burden is on track to reach a postwar high (around 38% of national income by 2030–31) and the Office for Budget Responsibility is now openly warning about the behavioural consequences. The problem isn’t that higher taxes can’t raise money; it’s that, past a certain point, the system starts to make extra effort feel pointless.
Frozen thresholds do a lot of the heavy lifting within the rising UK tax burden, quietly pulling more income into higher bands. Add rising national insurance and the creep becomes structural: tax receipts rise from roughly £480bn in 2025–26 towards £600bn by 2030–31, but the OBR cautions that the marginal rate experience can deter people within an already increasing UK tax burden from working more or seeking higher pay.
This lands in the week of the Spring Statement with an awkward backdrop. The OBR is already projecting unemployment peaking around 5.3% by year-end, and it flags longer-run risks from “technological displacement” – AI eating into taxable employment in ways the fiscal model struggles to capture cleanly. Meanwhile welfare pressures, especially pensions and disability benefits, are expected to rise toward 11.2% of GDP by 2030.
Net migration assumptions have been reduced, trimming the future size of the labour force, which, in turn, reduces the future tax base. None of these are ideological claims; they’re the accountant’s version of gravity. The tension is what ministers do next. Public services that aren’t “protected” (the piece highlights areas like education and transport) risk real-terms squeezes unless extra spending is agreed, but the headroom to fund it is thin. At the same time, external shocks are creeping back into view.
The Times notes the risk that rising oil and gas prices linked to Middle East conflict could render neat forecasts stale quickly, because energy shocks bite inflation, rates and borrowing costs simultaneously. The message is not “tax cuts now”. It’s more sobering: the UK is leaning heavily on stealth mechanisms to raise money, adding to the overall tax burden and the OBR is telling the government that behaviour eventually responds. When that happens, the revenue curve becomes less reliable. And in a low-growth country, unreliable revenue is the last thing you want.
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It is important to take professional advice before making any decision relating to your personal finances. Information within this blog is based on our current understanding of taxation and can be subject to change in future.
It does not provide individual tailored investment advice and is for guidance only. Some rules may vary in different parts of the UK; please ask for details. We cannot assume legal liability for any errors or omissions it might contain. Levels and bases of, and reliefs from, taxation are those currently applying or proposed and are subject to change; their value depends on the individual circumstances of the investor.
The value of investments can go down as well as up and you may not get back the full amount you invested. The past is not a guide to future performance and past performance may not necessarily be repeated.
If you withdraw from an investment in the early years, you may not get back the full amount you invested. Changes in the rates of exchange may have an adverse effect on the value or price of an investment in sterling terms if it is denominated in a foreign currency. Taxation depends on individual circumstances as well as tax law and HMRC practice which can change.
The information contained within the blog is for information purposes only and does not constitute financial advice.
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