The State Pension triple lock: what does it actually mean for you?
by Doug Brodie
If you’ve been following the news about the State Pension, you’ve probably heard plenty about the “triple lock”.
It sounds reassuring. But what does it actually protect? Why does it cost so much? And what would changing it mean for the income you receive in retirement?
Our printable research guide takes a closer look at the figures in more detail, but here's a basic overview.
What is the triple lock?
The triple lock is the promise to increase the basic and new State Pension each April by whichever of these three figures is highest:
Inflation: how quickly prices are rising, measured by the Consumer Prices Index (CPI).
Average earnings growth: how quickly pay is rising.
2.5%: a minimum annual increase.
For example, if prices rise by 3%, average pay rises by 4% and the minimum is 2.5%, the pension increase would be 4%.
The idea is to help pensioners keep up with rising living costs and share in improvements in working people’s pay. It applies to the State Pension. It doesn’t automatically increase your workplace or private pensions.
Why does choosing the highest figure matter?
Because each increase builds on the last one. Imagine inflation is particularly high one year. The State Pension rises to help pensioners keep up with prices.
The following year, pay rises faster than inflation. The pension then receives that higher increase, calculated on the amount it has already reached. That extra increase stays in the pension. It becomes part of the starting point for every future rise. Over time, this can produce a considerably bigger pension than following prices or earnings alone.
How much difference has it made?
Our research illustrates this by starting with £100 of State Pension in 2010–11 and tracking how it would have grown under different approaches. By April 2026, that £100 would have become approximately:
£160 if it had followed inflation alone.
£166 if it had followed average earnings alone.
£189 under the increases actually paid.
Those are illustrative amounts, rather than an individual’s pension entitlement. Our guide explains the calculations and the exceptions along the way.
The interesting finding is that the extra cost doesn’t come simply from one particularly generous part of the triple lock. Much of it comes from switching between the measures, keeping the benefit of each year’s highest increase.
For pensioners, that has meant a higher State Pension. For the government, it has meant a larger ongoing bill.
What is changing and when?
The government has announced plans to adjust the system from April 2030. Under the proposed approach, the State Pension would still rise each year by at least inflation or 2.5%. There would also be a mechanism to keep it in step with average earnings over time.
That's different from promising to match earnings growth in every individual year. It's also different from cutting the amount of State Pension people already receive. The proposed change concerns how future increases are calculated.
Why is this worth understanding?
Whether you already receive your State Pension or are planning ahead, it may form an important part of your retirement income. Understanding how it increases will help you see beyond the headlines and ask useful questions about your own plans. How much of your spending will it cover? How will the rest of your income keep up with rising prices?
Nobody can tell you exactly what future pension increases will be. But understanding the rules gives you a better starting point.
Our research guide, “Which Part of the Triple Lock Has Cost the Most?”, puts the figures side by side, with charts and a year-by-year breakdown.
It explains how the increases have built up, why the combined approach costs more, and how the proposed changes would work.
Download the printable guide to read at your own pace and understand what sits behind the triple lock headlines.
For general information only. This article and the guide do not provide personal financial advice.
About the author
Doug Brodie is Founder and CEO of Chancery Lane Income Planners. He has specialised in retirement income for over thirty years and is Chartered with both the CISI and CII. This article is general information and not personal advice. Tax rules can change, and the impact of any planning depends on your specific circumstances. Natural income is not guaranteed and dividends can be reduced. Capital is at risk and past performance is not a guide to future returns.