What Is the State Pension Triple Lock?

01 The three measures, and which one wins

The triple lock raises the State Pension each April by the highest of three figures: CPI inflation measured to the previous September, the growth in average weekly earnings over May to July, or a flat 2.5%.

The Department for Work and Pensions confirms the applicable figure in the autumn, which is why the increase is known months before it is paid and why the September inflation print attracts attention it would not otherwise get.

So in a high-inflation year CPI wins; in a strong wage-growth year earnings win; in a flat year the 2.5% floor applies. Over a run of years the lock therefore grows the pension slightly faster than prices alone, because it captures whichever measure happened to be highest each year and never gives the difference back.

That ratchet is the whole point and the whole cost. A measure that took the average of the three would roughly track the economy; taking the maximum each year compounds a small real gain annually, which is excellent for pensioners and is why the policy is debated at every fiscal event.

One detail that surprises people: the lock applies to the new State Pension and the basic State Pension, but not to every element of the older system. Additional State Pension and protected payments are generally uprated by CPI alone, so someone receiving a mix sees only part of their income rise by the full triple-locked amount.

Source: DWP — Benefit and pension rates

02 What the lock is actually worth

A triple-locked State Pension is worth far more than its weekly number because the open market does not sell anything like it. To buy a comparable income privately — fully inflation-protected, paid for life, government-backed, with a 2.5% floor — you would pay an enormous premium, because inflation-linked annuities start 30–40% lower than level ones and no commercial product offers a guaranteed floor on top.

That's the reframe that matters for planning: the full new State Pension isn't "just" its annual figure. Treated as the inflation-linked annuity it really is, it's the single most valuable asset on most households' balance sheets — which is exactly why filling National Insurance gaps to secure the full amount is so often worth it.

03 Where it doesn't apply, and whether it lasts

The triple lock covers the new and basic State Pension only — not Additional State Pension, which rises by CPI alone, and not most workplace or private pensions, whose escalation depends on their own rules. So a retiree with a SERPS element sees part of their state income rise by the full lock and part by CPI.

And it is a policy commitment, not an immovable law. It was suspended once already — the earnings element was set aside for 2022–23 after a pandemic-distorted wage spike — and every government revisits its cost. Plan as if the floor holds, but don't treat decades of guaranteed real-terms growth as contractually certain.

Source: GOV.UK — The new State Pension