13th September 2026
The state pension has become one of the most politically sensitive subjects in Britain.
For millions of pensioners it is the foundation of their income. For governments it is one of the largest items of public expenditure. And for younger workers, there is an increasingly obvious question: will the system still be affordable by the time they retire?
A new analysis from the Institute for Fiscal Studies (IFS) does not provide an easy answer.
Instead, it shows why the triple lock has become both an important protection for pensioners and an increasingly difficult commitment for future governments.
The triple lock was introduced in 2011. Every April, the basic and new state pensions increase by whichever is highest of three measures: inflation, average earnings growth or 2.5%.
The intention was straightforward.
Pensioners should not see their living standards eroded by inflation, they should share in rising prosperity when wages increase, and they should have a minimum guaranteed increase of 2.5% even when inflation and earnings growth are particularly low.
It sounds reasonable but there is a catch.
The triple lock has worked
It is important not to lose sight of why the policy was introduced. Before the triple lock, the state pension had increasingly fallen behind the incomes of working people.
Between 1980 and 2010, the pension was generally increased in line with inflation. But over much of that period wages rose faster than prices. Pensioners therefore found themselves falling further behind workers.
The IFS says the triple lock has materially increased the value of the state pension since 2011.
A full new state pension is now worth around £12,500 a year. Had it instead risen in line with average earnings since 2010, it would be about 12% lower, or roughly £1,500 a year less.
That is not a trivial difference for someone living mainly on the state pension.
The improvement in pensioner incomes is also visible in wider statistics. Median pensioner household disposable income increased by 15% between 2010 and 2023.
Pensioners are now much closer to the incomes of people below state pension age than they were several decades ago. The IFS estimates that pensioners had median incomes around 20% below those of working-age people 30 years ago. Today the two groups have broadly similar median incomes after housing costs.
Relative pensioner poverty has also fallen.
So it would be wrong to portray the triple lock simply as an expensive political gimmick. It has achieved something important.
But there is a large bill
There is another side to the story. The Government is now spending around £154 billion a year on the state pension.
That makes it Britain's largest benefit and puts its annual cost roughly in the same league as the combined budgets of the Ministry of Defence and the Department for Education.
State pension spending is now around 4.9% of national income, compared with 4.3% in 2010 and 3.6% two decades ago.
The IFS estimates that the triple lock has increased annual state pension spending by around £16 billion compared with what spending would have been if the flat-rate state pension had instead risen in line with average earnings since 2010.
That does not mean the entire increase in pension spending is caused by the triple lock. The number of pensioners, changes in the state pension age and other factors also matter. But the triple lock is an important part of the increase.
And because every year's increase becomes part of the starting point for the following year, the effect compounds.
That is what makes the policy particularly interesting.
Why 2.5% can become surprisingly expensive
The 2.5% part of the triple lock is often misunderstood. If inflation is 1% and wages are rising by 2%, the pension still increases by 2.5%.
That sounds harmless.
But imagine this happens repeatedly.
Each 2.5% increase is added to the previous year's pension. Over many years, those apparently small additional increases compound.
The IFS therefore describes the long-term cost of the triple lock as substantial but highly uncertain. Its modelling suggests that keeping it until 2050 could cost around £20 billion a year in today's money, compared with an earnings-linked system.
But the range of possible outcomes is enormous.
The eventual cost could reasonably be somewhere between £5 billion and £40 billion a year, depending on what happens to inflation, wages and economic growth.
That uncertainty is important. The triple lock becomes particularly expensive when inflation and earnings behave unpredictably.
What happens next?
The immediate question is much less dramatic. The IFS says the state pension is very likely to rise in April 2027 according to earnings growth rather than inflation or the 2.5% floor. The relevant earnings figures are due from the ONS on 15 September, with the IFS expecting the figure to be around 4%.
So pensioners are likely to receive another significant increase next year. Under current forecasts, the triple lock itself is not expected to add an enormous amount to the pension bill over the remainder of this Parliament.
The IFS estimates that, if the Office for Budget Responsibility's forecasts prove correct, it would add around £600 million a year to state pension spending by 2029–30 compared with an earnings-linked system.
But that £600 million is not a one-off. It becomes part of the pension spending base and future increases are calculated on top of it.
This is the "ratchet" effect that makes the long-term issue much more important than the immediate cost.
Is the triple lock unfair to younger people?
This is where the debate becomes more difficult. A pensioner who has worked and paid National Insurance throughout their working life can reasonably argue that they have earned the right to a secure retirement.
Many pensioners also have relatively modest incomes and face rising costs for heating, food and other essentials. Removing protection against inflation could therefore cause genuine hardship.
But younger workers face their own pressures. They are paying taxes and National Insurance today to support the pension system while also dealing with high housing costs, student debt for some, expensive childcare and the difficulty of saving for their own retirement.
There is therefore a legitimate question about intergenerational fairness.
It is not an argument against pensioners. It is an argument about whether one generation should receive an unusually strong guarantee at the expense of future generations.
There is another problem: not every pensioner needs the same protection
The triple lock applies broadly rather than according to need. Someone whose only income is the state pension benefits greatly from every increase.
Someone with a substantial occupational pension, investments and other assets receives exactly the same percentage increase in their state pension.
That is one reason why some economists favour a different approach. The objective could be to ensure that the state pension remains adequate for people who depend upon it while reducing the automatic increases received by those who are already comfortably retired.
But there is a danger here too. Trying to introduce a system based on individual wealth or income could make pensions much more complicated and potentially discourage people from saving.
The simplicity of the triple lock is one of its strengths.
There may be a middle way
The IFS points towards an alternative used in Australia. Under that approach, the pension is linked to average earnings over the longer term, but there is temporary protection when inflation rises above earnings growth.
That could provide something the present system does not. A pensioner could be protected against an inflation shock without permanently increasing the pension's spending base every time inflation temporarily jumps.
In other words, the Government could protect pensioners from exceptional circumstances without promising that every temporary economic shock will permanently increase pension spending.
That deserves serious consideration.
The political problem
The difficulty is that the triple lock has become politically almost impossible to remove. Every major political party knows that pensioners vote.
And there is a powerful argument against changing a promise that millions of people have planned their retirement around. But governments cannot avoid the arithmetic forever.
Britain's population is ageing. The number of people receiving the state pension will continue to rise relative to the number of people of working age.
At the same time, the Government is already facing enormous demands on public spending from the NHS, social care, defence, housing, infrastructure and other services.
Every pound committed permanently to pensions is a pound that cannot be spent elsewhere unless taxes or borrowing increase. The question is therefore not whether pensioners deserve support. They do.
The question is what is the fairest and most sustainable way of providing it? Perhaps the real lesson is about promises
The triple lock illustrates a wider problem in British politics. Politicians are very good at making promises that sound affordable when they are introduced. They are much less good at explaining how those promises will interact with the economy over 20 or 30 years.
A guarantee that costs relatively little in one year can become extremely expensive when repeated year after year. The IFS is not arguing that pensioners should suddenly lose their protection.
Its analysis is essentially a warning that the country eventually needs to decide whether the triple lock remains the right long-term mechanism.
That is a much more reasonable debate than simply asking whether pensioners should receive a pension increase.
A balanced conclusion
The triple lock has done something valuable. It has helped restore the state pension's position relative to earnings, increased pensioner incomes and contributed to a substantial reduction in pensioner poverty.
Those achievements should not be dismissed. But success creates its own problem. The policy is now considerably more expensive than it was when introduced, and its future cost is difficult to predict. The IFS estimates a central long-term cost of around £20 billion a year by 2050 if it remains in place, but the actual figure could be far lower or considerably higher.
There is therefore a case for changing the system eventually. But that does not necessarily mean abolishing the principle behind the triple lock.
A more sensible reform might preserve a strong link between pensions and earnings, while providing extra protection when inflation suddenly surges.
That would retain the most important achievement of the triple lock preventing pensioners from being left behind while making the system more predictable for taxpayers and future generations.
The challenge for any Government will be to make that change without turning it into a battle between young and old.
Britain does not need a war between generations. It needs a pension system that both today's pensioners and tomorrow's pensioners can reasonably believe will still be there for them.
Source: Institute for Fiscal Studies, "What do you need to know about the triple lock?", 9 September 2026. https://ifs.org.uk/articles/what-do-you-need-know-about-triple-lock