What is a defined benefit pension?

If someone tells you they have a "final salary pension" or a "defined benefit pension," they're describing one of the most valuable things a pension scheme can offer: a guaranteed income for the rest of their life, calculated from a formula rather than from how well investments happened to perform. That guarantee is precisely what makes defined benefit (DB) pensions so different from — and generally so much more valuable than — the defined contribution (DC) pensions most private sector workers now have. This page explains exactly what a defined benefit pension is, how the calculation actually works, why these schemes have largely disappeared from the private sector while remaining standard in the public sector, and why they're often described as needing a six-figure pot to replicate if you tried to buy the same guaranteed income yourself.

The core idea: a promise, not a pot

A defined benefit pension promises you a specific, calculable income in retirement, based on your salary and how many years you worked for that employer — not on how much was paid in, or how investments performed along the way. The scheme (and, ultimately, the employer standing behind it) takes on the investment risk: if the scheme's investments do badly, the employer generally has to put in more money to make up the shortfall; if they do well, you don't get a bigger pension as a result, because the promise was fixed in advance. This is the defining feature that gives these schemes their name — the benefit is defined, rather than the contribution.

This stands in direct contrast to a defined contribution pension, where a pot of money is built up from your contributions, your employer's, and investment growth, and your eventual retirement income depends entirely on how large that pot has grown and what you do with it (drawdown, annuity, or a combination). With DC, you carry the investment risk; with DB, your employer or scheme does. That single difference in who bears the risk is why DB pensions are consistently rated as the more valuable and more secure form of workplace pension, all else being equal.

Why DB schemes are rare in the private sector but standard in the public sector

Defined benefit schemes used to be common across private sector employers too, but the vast majority have now closed to new joiners, and many have closed to further accrual for existing members as well. The reason is largely financial: as people live longer, and as investment returns became harder to predict with confidence (particularly through periods of low interest rates), the cost of guaranteeing a fixed income for an unknown, potentially very long retirement grew substantially, and many private employers found the ongoing liability too large and too unpredictable to keep funding. Regulatory requirements to keep these schemes properly funded added further cost, and most private companies concluded that a defined contribution scheme, where the employer's cost is capped at a fixed contribution rate, was more sustainable.

The public sector has taken a different path. Because central and local government (unlike a private company) doesn't face the same risk of insolvency, and because DB pensions are seen as an important part of public sector pay and recruitment — particularly for professions like teaching, nursing, and the civil service, where pay itself is often lower than comparable private sector roles — defined benefit pensions remain the default across most of the public sector. The NHS Pension Scheme, the Teachers' Pension Scheme, the Civil Service pension arrangements, and the Local Government Pension Scheme (LGPS) are all still defined benefit schemes, though many have moved from a final salary structure to a career average structure over the past decade or so, which we cover in detail in our companion guide comparing final salary vs career average schemes.

How the calculation actually works: accrual rates

The core building block of any defined benefit calculation is the accrual rate — the fraction of your salary you earn towards your pension for each year of service. Common accrual rates include 1/60th, 1/80th, and 1/49th, and the rate that applies is entirely set by the scheme's rules. A lower fraction (like 1/80th) means you build up a smaller slice of pension per year of service; a higher fraction (like 1/49th, seen in some current public sector career average schemes) means you build up more per year, and is more generous.

A worked example: putting the formula together

The basic formula for a defined benefit pension is: years of service × accrual rate × relevant salary = annual pension. Let's work through it with a concrete example. Take Michael, who worked for the same employer for 25 years, in a scheme with a 1/60th accrual rate, and whose final salary (the "relevant salary" in a final salary scheme) was £40,000 when he retired. His annual pension is calculated as 25 years × (1/60) × £40,000, which comes to £16,667 a year, guaranteed for the rest of his life, and typically increasing each year in line with inflation (subject to the scheme's specific rules on inflation-linking, called indexation).

That £16,667 a year is not a one-off figure that depletes over time — Michael will receive it every year for as long as he lives, and if the scheme provides a spouse's pension (most do), a proportion of it will continue to be paid to a surviving spouse or civil partner after his death. This lifelong, inflation-linked, family-protected guarantee is exactly what makes DB pensions so valuable, and exactly what's so hard and expensive to replicate independently.

Why DB pensions are considered so valuable

To understand just how valuable a DB pension is, it helps to ask: how much would it cost to buy the same guaranteed income on the open market? The answer is usually a strikingly large number. Buying an equivalent guaranteed, inflation-linked annual income of, say, £16,667 a year (as in Michael's example above) through an annuity — the closest commercial product to what a DB scheme provides — could easily require a pension pot in the region of £400,000 to £500,000 or more, depending on age, health, and prevailing annuity rates at the time. This is precisely why financial commentators often describe a DB pension as being "worth" a six-figure sum in DC-pot terms, even though no such pot ever physically exists for the member — the guarantee itself carries that value.

This is also why transferring out of a DB scheme into a DC arrangement is treated with such caution by regulators, and usually requires regulated financial advice for transfers above a certain value. Giving up a guaranteed income for a transferable cash sum means giving up the employer's promise to keep paying you for life, in exchange for taking on the investment and longevity risk yourself — a trade-off that makes sense for a relatively small number of people in particular circumstances, but is generally not in most people's best interests. Our companion page on defined benefit transfer values goes into this decision in much more depth.

If you have a defined benefit pension

If you're a member of a DB scheme, either currently or from a previous job, it's worth requesting a benefit statement from the scheme administrator if you haven't seen one recently — this will show your accrued pension based on your service and salary to date, along with any lump sum entitlement and details of dependants' benefits. Because the calculation depends on your specific years of service and (depending on the scheme) either your final salary or your average revalued salary across your career, no generic calculator can substitute for your own scheme's official statement, so always treat online estimates as illustrative only.

Defined benefit pensions in practice: public sector examples

Because so many defined benefit pensions in the UK today sit in the public sector, it's worth a quick look at how a few well-known schemes actually structure their accrual, even though the fine detail varies for members depending on when they joined and any transitional protection they hold. The NHS Pension Scheme's current section builds up benefits on a career average basis with an accrual rate of 1/54th of pensionable pay for each year, revalued annually. The Teachers' Pension Scheme uses a broadly similar career average design, with an accrual rate of 1/57th. The Civil Service's Alpha scheme uses an accrual rate of 1/43.1th, one of the more generous rates among major public sector schemes. The Local Government Pension Scheme (LGPS) uses a 1/49th accrual rate on a career average basis. All of these are still defined benefit pensions in the sense this page describes — a guaranteed, formula-based income — even though most have moved away from a pure final salary structure; see our companion page on final salary vs career average schemes for how that distinction plays out in practice.

What happens if a scheme or employer runs into trouble?

One question people often ask about defined benefit pensions is what happens to the promise if the sponsoring employer becomes insolvent. For private sector schemes, the Pension Protection Fund (PPF) exists precisely for this situation — if an eligible DB scheme's employer becomes insolvent and the scheme doesn't have enough assets to pay full benefits, the PPF steps in and pays compensation, generally at or close to 100% of accrued benefits for those already past the scheme's normal pension age, and at a slightly reduced level for others, subject to a compensation cap for some members. This is an important safety net that reduces (though doesn't entirely eliminate) the risk of losing your pension outright if a private sector employer fails. Public sector schemes work differently again: because they're backed by the government rather than a single private employer, there's no equivalent insolvency risk in the same way, and members' benefits are effectively guaranteed by the state.

Frequently asked questions

• Q

  Can I have both a defined benefit and a defined contribution pension? Yes — many people build up DB pensions in earlier or public sector jobs and DC pensions in later or private sector roles, and both count towards your overall retirement income and towards your annual allowance for tax relief purposes.

• Q

  Does a defined benefit pension pay a lump sum as well as an income? Many schemes do offer a tax-free lump sum, either automatically (common in older 1/80th-style schemes) or by letting you exchange some of your annual pension for a lump sum at retirement, usually within limits set by the scheme and by tax rules.

• Q

  Will my defined benefit pension increase with inflation once it's in payment? Most DB pensions include some form of inflation-linked increase once in payment, though the exact index used and whether increases are capped varies by scheme, so it's worth checking your specific scheme's rules.

• Q

  Can I take my defined benefit pension early? Most schemes allow early retirement from a set minimum age, usually with a reduction applied to reflect the fact that the pension will be paid for longer — check your scheme's specific early retirement terms before deciding.

Defined benefit vs defined contribution at a glance

Neither structure is universally "better" — a DB pension offers certainty and protection from investment and longevity risk, which is why it's so highly valued, while a DC pension offers flexibility and, for some savers, the potential (though not the guarantee) of higher growth if investments perform well. Many people, particularly those who have changed jobs several times, end up with a mixture of both by the time they retire, and understanding how each one works helps you build an accurate overall picture of your retirement income rather than looking at any single pension in isolation.

Why this matters for your overall retirement planning

Understanding whether you hold a defined benefit pension, and roughly how much it's likely to pay, is one of the most important pieces of your retirement planning puzzle, precisely because it changes how much additional saving you might need elsewhere. Someone with a solid DB pension covering a large share of their target retirement income can reasonably plan to save less aggressively into other pensions or investments than someone relying entirely on defined contribution saving, where nothing is guaranteed. Conversely, if your DB entitlement is smaller than you assumed — perhaps because you only worked for that employer for a few years, or joined a career average section rather than an older final salary one — it's better to find that out well before retirement, while there's still time to adjust your other savings accordingly, rather than discovering a shortfall once you've already stopped working.