Britain’s state pension bill is set to nearly double over the coming half-century, climbing from five per cent to approximately nine per cent of gross domestic product (GDP) by 2075/76.
The Office for Budget Responsibility’s (OBR) latest Fiscal risks and sustainability report has shined a light on the growing cost of the retirement benefit.
The watchdog’s analysis identifies two primary forces behind this dramatic increase: an ageing population and the ongoing cost of the triple lock mechanism.
Under current policy, pension payments rise annually by whichever is highest among earnings growth, consumer price index (CPI) inflation, or 2.5 per cent.
State pension spending is cost more of Britain’s GDP
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The OBR calculated these projections using historical patterns of inflation and wage volatility to model future spending pressures.
Britain’s demographic transformation underpins these fiscal pressures, with the median age expected to climb from 40 today to 49 by 2075.
The OBR’s baseline assumes the triple lock remains in place throughout this period. However, an alternative scenario linking pension increases solely to average earnings would see spending reach roughly seven per cent of GDP by 2075/76 rather than nine per cent.
This earnings-linked approach would cut projected debt levels by approximately one-tenth compared with maintaining the current triple lock arrangement.
How the state pension triple lock has changed over the years | GB NEWS / FIDELITY INTERNATIONAL
The OBS has offered estimates for how much state pension spending will cost under alternative funding models
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OBR
David Brooks, head of policy at Broadstone, characterised the projections as revealing a mounting tension between generations.
He shared: “While the triple lock has been successful in protecting pensioner incomes, the cost of maintaining that commitment falls on today’s workers through higher taxation and borrowing.”
Mr Brooks noted that with numerous pensioners holding substantial assets whilst younger people encounter significant obstacles to building wealth, questions arise about whether blanket increases represent optimal use of taxpayer funds.
The financial analyst added: “The real debate is whether taxpayer support should be targeted more effectively towards those who genuinely need it, rather than continuing to provide identical increases across the entire pensioner population regardless of income or wealth.”
How much will the state pension triple lock cost the British taxpayer? | OBR
The OBR cautioned that its long-term projections serve as illustrations of fiscal pressures rather than precise forecasts.
Nevertheless, the watchdog warned that public finances would follow an unsustainable trajectory under nearly all modelled scenarios without Government intervention.
Total public spending is forecast to rise from 40 per cent of GDP in 2030 to 49 per cent by 2075, with state pension costs representing a major contributor to this increase.
The OBR emphasised that addressing these long-term fiscal challenges sooner rather than later would both reduce risk and prove less expensive over time.

