The Office for Budget Responsibility has published its annual long-term fiscal projections, and the central message is stark: on current policy, UK public debt does not stabilise, it grows without limit over the coming decades.
In its baseline scenario, the OBR projects UK public sector debt rising from around 95% of GDP in 2030-31 to approximately 300% of GDP by 2075-76. The OBR is explicit that this is not a forecast of what will happen, but a projection of what would happen absent policy change, and that no advanced economy could actually remain on such a path.
UK public debt, baseline scenario (% of GDP)
| 2030-31 | 32% | |
| 2075-76 | 100% |
Bars scaled relative to the 2075-76 figure (300% of GDP = 100% bar width). 2030-31 figure (95%) shown at proportional scale for comparison.
Source: OBR, Fiscal risks and sustainability report, 7 July 2026.
Why this matters now, not in 50 years
The OBR's central point is about timing, not just direction: the report states that the scale of tax or spending adjustment needed to keep debt on a sustainable path increases the longer action is delayed. Acting sooner spreads the cost over a longer period and across more taxpayers; waiting concentrates it onto whoever is in government, and paying, when the position becomes urgent.
The OBR attributes much of the long-term pressure to an ageing population, driving higher spending on health, social care and the state pension over the projection period, alongside the structural effects of two decades of elevated borrowing relative to other advanced economies.
What this means for household financial planning
Long-term fiscal sustainability reports do not translate into next month's tax bill, but they are a signal worth watching for anyone doing multi-decade financial planning, particularly around pensions, inheritance tax exposure, and assumptions about future state pension provision. They are also the backdrop against which any Autumn Statement tax speculation should be read: this is the structural pressure policymakers are working against, whatever specific measures are or are not announced.
Disclaimer: This article summarises official OBR projections and is for general information only. OBR long-term scenarios are explicitly not forecasts of confirmed policy and should not be used as a basis for individual financial decisions. Seek independent financial advice for pension, tax or estate planning specific to your circumstances.
