OBR Warns UK Debt Could Spiral to 300% of GDP by 2076 Without Action

The Office for Budget Responsibility has warned that UK public debt will move onto an unsustainable path from the 2040s unless policymakers act now. In its latest fiscal risks and sustainability report, the OBR projects debt soaring from 95% of GDP in 2030-31 to around 300% by 2075-76 under its baseline scenario. The watchdog cited an ageing population, rising health and pension costs, and defence spending commitments as the main pressures on public finances.

Why the OBR is sounding the alarm now

The OBR’s report, published July 7, comes as Andy Burnham prepares to become prime minister. The watchdog stressed that “in nearly all of the scenarios we explore, debt eventually moves onto an unsustainable and ever-rising path.” It warned that debt would “ultimately grow explosively” if left unchecked, making action today far cheaper than delay. Tom Josephs of the OBR noted the crisis could arrive earlier if the government fails to stick to deficit-reduction plans or faces another major economic shock.

State pensions and the triple lock problem

State pension spending is projected to rise from 5% of GDP today to around 9% by 2075-76 under current policy, driven by population ageing and the triple lock. The triple lock guarantees pensions rise annually by the highest of inflation, earnings growth, or 2.5%. The OBR estimates the triple lock alone accounts for 1.6 percentage points of the 2.7 percentage point rise in pension spending. If pensions were linked to earnings alone, spending would reach only 7% of GDP by 2075-76, saving 2% of GDP over the period. Nigel Green of deVere Group warned the triple lock, though “politically untouchable,” will eventually face pressure as fiscal realities mount.

Health spending and defence costs add to the burden

Health spending is expected to rise from 8% of GDP to 13% by 2075, as the proportion of older people in the population increases. The OBR assumes the government will meet its pledge to spend 3.5% of GDP on defence, requiring an additional £28 billion per year despite last week’s investment plan announcement. Primary government spending, excluding debt interest, is projected to jump from 40% of GDP in 2030-31 to 49% by 2075-76. The OBR stressed that acting sooner would require less costly fiscal adjustment than delaying, placing less burden on future generations.

What the numbers mean for taxpayers and pensioners

The OBR’s baseline scenario assumes Chancellor Rachel Reeves’ fiscal plans will stabilise debt at about 95% of GDP by 2030-31. However, debt will accelerate again from the mid-2030s without new policy changes. The UK has experienced one of the largest increases in government debt of any advanced economy over the past two decades. The OBR stressed that unsustainable fiscal outcomes are today’s challenge, not tomorrow’s. Younger workers face higher taxes and borrowing to fund current spending, while pensioners may see means-testing or changes to universal pension increases if the triple lock is reformed.

Final Thoughts

The OBR’s warning puts immediate pressure on Burnham to choose between raising taxes, cutting spending, or reforming the triple lock. With debt projected to spiral to 300% of GDP by 2076 without action, delay will only make the adjustment more painful and costly for future generations.

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