UK debt faces unsustainable long-term rise, OBR warns

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UK debt faces unsustainable rise

Highlights

UK government debt has risen from around 30 per cent to nearly 100 per cent of GDP due to shocks and weak productivity.
The OBR base case forecasts UK debt may be broadly stable for 10 years but on an unsustainable upward trajectory after 20 years without tax or spending changes.
Delaying fiscal adjustment may require twice as large a deficit reduction if postponed to mid-century, increasing the burden on younger generations.

Long-term fiscal pressures build

As reported by the Financial Times, analysis presented by the Office for Budget Responsibility says the UK's debt path becomes increasingly difficult to sustain over the coming decades if public spending rises with demand and the tax system remains broadly unchanged.

The article says government debt stood at around 30 per cent of GDP a generation ago and is now close to 100 per cent. A run of shocks, including the financial crisis, Covid-19 and higher energy prices linked to wars elsewhere, has pushed borrowing higher, while weak productivity and income growth has made the strain harder to absorb.

In a range of 50-year scenarios, the OBR says substantial changes to taxation and spending are likely to be needed over time. In its base case, assuming the current fiscal consolidation plan is delivered and no major new shocks hit, debt may stay broadly stable for 10 years or more, but is significantly higher as a share of GDP 20 years from now and is then on an unsustainable upward trajectory.

Delayed action raises future costs

Most alternative scenarios still point to debt rising unsustainably, even if some outcomes are better than others. The central warning is that the balance between spending and tax revenues ultimately needs to adjust, because markets may not indefinitely absorb ever larger volumes of new debt.

If that adjustment is postponed until debt pressures become acute, the eventual mix of spending cuts and tax increases is likely to be much more painful for both government and households. The article argues that earlier action would reduce the scale of future tightening, and that the deficit reduction needed to keep debt at current levels relative to GDP could be twice as large if it is delayed until the middle of the century rather than introduced in the early 2030s.

The warning carries a broader economic and generational implication for the UK, because the heaviest burden of a late fiscal correction would fall on today's younger population. That leaves long-term debt sustainability as a current policy issue for public finances, not just a problem for a future government.

UK political uncertainty and renewed U.S.–Iran tensions were keeping currency markets cautious, with a jump in oil prices but only limited moves in major FX pairs. Our earlier coverage noted sterling holding broadly steady as investors weighed what a potential change in government and the next finance minister could mean for public spending plans and the UK’s already stretched public finances.

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