A final salary pension lump sum comes from a scheme formula, such as three times the pension, or from swapping pension for cash, within HMRC's limit.

Pension Wise, MoneyHelper's free and impartial guidance service, backed by government, is for people with a defined contribution pension and explains the options for taking money from one. For a final salary lump sum your scheme quotes the figures, and MoneyHelper's pension specialists give free guidance to people Pension Wise does not cover. For a person to talk through what a lump sum would mean next to your other pensions, the enquiry form here brings you a free ring from an FCA-authorised adviser.

How is a final salary pension lump sum calculated?

Cash from a defined benefit scheme arises in one of two ways, and a third test caps both. Some schemes pay a lump sum automatically, worked out from your pension by a formula in the scheme rules. Schemes such as the Local Government Pension Scheme (LGPS) and the Civil Service classic scheme also let you commute: give up some yearly pension and take cash instead, at a rate the scheme sets. Whichever route, HMRC limits how much of the result can be tax free, by reference to what the whole package of pension and cash is worth.

That is why the sum has no single answer. Your scheme's pension formula, whether it has an automatic lump sum, its commutation rate and HMRC's limit each play a part. The sections below start with HMRC's limit, because it shapes the rest, then take the scheme rules in turn, with two worked examples. The wider picture of how a final salary pension is built is in final salary pensions explained.

The tax-free limit: how HMRC values a final salary pension

For a defined benefit scheme the 25% limit is not a quarter of a pot, because there is no pot. GOV.UK gives the general rule as up to 25% of the amount built up. For a scheme pension, HMRC's Pensions Tax Manual replaces that amount with a notional value, using the formula (A + (B x C) - D) / 4, where:

  • A is the lump sum itself;
  • B is 20, "the relevant valuation factor as per Section 276 Finance Act 2004";
  • C is "the amount of the pension which will be payable to the member in the 12 months beginning with the day the member becomes entitled to the pension"; and
  • D is a deduction used only where the rights include a disqualifying pension credit, which HMRC defines as a pension credit created when the ex-spouse's or former civil partner's pension being shared was already being paid.

In plain words, the manual takes a quarter of the pension's value plus the lump sum, with the pension valued by multiplying a year's pension by 20. Ignoring D, the tax-free limit is a quarter of (the lump sum + 20 x the yearly pension left).

Where the cash is bought by giving up pension, one detail matters. The manual says "it is the actual post-commutation pension that is measured in 'C'". Giving up pension for cash lowers C as it raises A, so the limit moves as you swap. HMRC resolves this with a closed form: "20fg / (20 + 3f)", where "f = is the commutation factor being applied by the scheme" and "g = gross scheme pension entitlement before commutation". HMRC states that the equation assumes the scheme pays only a pension commencement lump sum. Its own example uses a £30,000 pension and a factor of 15:1: "The maximum pension commencement lump sum that can be paid is £138,461."

If a scheme pays more than the permitted maximum, the manual says "any amount over the permitted maximum will not be a pension commencement lump sum", so the excess is outside the tax-free treatment. The permitted maximum is also the lower of this quarter-of-value amount and the lump sum allowance you have left, covered further down.

Automatic lump sums: three times the pension in some public schemes

An automatic lump sum is built into the benefit before you make any choice, and some older public-sector schemes have one. The LGPS in England and Wales is a clear case. Its member site says the scheme changed from final salary to career average on 1 April 2014, and that membership before 1 April 2008 earns a pension of 1/80th of final pay, with three times that pension paid as an automatic lump sum. Membership from 1 April 2008 to 31 March 2014 earns a pension of 1/60th of final pay.

The scheme's own example shows the arithmetic. A member with seven years of pre-2008 service and final pay of £28,000 gets an annual pension of 7/80ths x £28,000 = £2,450 for those years, plus a tax-free lump sum of 3 x 7/80ths x £28,000 = £7,350. The example's lump sum is worked out on the pre-2008 years alone, so the automatic sum is three times the pension from those years, not the whole pension.

The Civil Service classic scheme works in a similar way. Its guide builds a classic pension from final pensionable earnings multiplied by reckonable service and divided by 80, and adds a lump sum of three times the annual pension, reduced if you owe contributions for a widow's, widower's or civil partner's benefits or for incapacitated children you nominated. The NHS scheme has rules of its own, set out on the NHS pension lump sum page, and other schemes set theirs in their own member guides. Not sure whether yours pays an automatic sum? Put your scheme's name into the form here and the adviser who rings back can talk through how such a lump sum is usually built.

The commutation factor: how much cash each £1 of pension buys

Commutation is the swap of yearly pension for a lump sum, and the commutation factor is the rate of exchange. The LGPS gives £12 of lump sum for every £1 a year of pension given up, and says most members can make the swap. The Civil Service classic guide states the same rate the other way round: each £12 of additional lump sum reduces the pension by £1 a year. At that rate, £1,000 a year of pension given up buys £12,000 of cash, and the pension stays £1,000 a year lower from then on.

That 12 to 1 is the factor those two schemes publish, not a standard one. HMRC's manual treats the factor as the scheme's own, and its worked examples use 15:1 and 16:1. A higher factor gives more cash for each £1 of pension, so the same pension swapped on a 15:1 factor yields more cash than on 12:1. Why a scheme sets its factor where it does is a question for that scheme.

A few conditions travel with the swap. The LGPS lets you swap any amount of pension for lump sum up to the limit, but you must tell the administrator before benefits are paid, and once you have chosen you cannot change your decision or swap later. Scheme rules vary, so check before relying on a second chance. How much to swap is a personal trade-off. To weigh yours with someone qualified, note your scheme and yearly pension on this page's enquiry form; a free phone call about the swap from an FCA-authorised adviser follows; final salary pension options at retirement sets out the other routes.

Two sample calculations of the maximum lump sum

The table applies HMRC's equation to two hypothetical pensions. Both borrow the 12 to 1 factor of the LGPS and the Civil Service classic scheme for illustration: the first imagines a scheme with no automatic lump sum, the second uses classic's terms. They are illustrations of the method, calculated on 21 October 2026 with the working shown below, not anyone's entitlement, and they leave out earlier lump sums, protections and tax. Neither comes near the lump sum allowance.

Scheme with no automatic lump sumScheme with automatic lump sum of 3 x pension
Yearly pension before any swap£10,000£9,000
Automatic lump sumnone£27,000
Extra cash at the maximum swapabout £42,857about £21,214
Total lump sumabout £42,857about £48,214
Pension given up each yearabout £3,571about £1,768
Pension left each yearabout £6,429about £7,232

For the first pension, the equation gives 20 x 12 x £10,000 / (20 + 3 x 12) = £2,400,000 / 56, about £42,857. Dividing by 12 shows about £3,571 of pension given up, leaving about £6,428.57. As a check, 20 x £6,428.57 is about £128,571; add the £42,857 lump sum and divide by four and the answer is again about £42,857.

The second follows the Civil Service classic guide: the automatic 3 times pension, then, under the guide's heading on an additional tax-free lump sum, "The maximum lump sum you can take will be your pension times 33/14". So 33/14 x £9,000 is about £21,214 on top of the £27,000, costing about £1,768 a year and leaving about £7,232.14. The check: 20 x £7,232.14 is about £144,643; add £48,214 and divide by four to get £48,214 again. The automatic sum and the swap together land on HMRC's limit, which is why the 33/14 figure reads as the extra cash rather than the total.

Two things to note. The total in the first column comes entirely from giving up pension, while in the second the automatic sum covers part of it. And the factors are each scheme's own: the same member on a 15:1 factor would give up less pension for the same cash.

The lump sum allowance, tax and your other pensions

The quarter-of-value test is one ceiling; the lump sum allowance is the other. GOV.UK says "The most you can take is £268,275" and that a pension commencement lump sum counts towards it. Income Tax is due on any amount above the allowances, and GOV.UK adds that a protected allowance may increase the tax-free lump sums you can take. How it is counted for defined benefit schemes is on the defined benefit lump sum allowance page.

The allowance is shared. GOV.UK says the allowance used must be totalled across every pension scheme you belong to, so a lump sum from a final salary scheme can leave less for a personal pension, which taking a lump sum from two pensions covers. The Civil Service guide adds that the retirement lump sum is tax-free subject to the allowance while the pension is treated as earned income, so the pension that remains after a swap is taxed as income. The wider rules on tax-free cash are in the tax-free lump sum guide.

Several schemes, a large pension or a pension already partly in payment make the sums harder to do alone. Whatever you type into the enquiry form below reaches an FCA-authorised adviser, who then phones to go through the cash, your other pensions and the tax together, free of charge.

Final salary lump sum questions

Where can I find a final salary pension lump sum calculator?

Start with your own scheme's. The LGPS member site has a lump sum calculator, and the Civil Service classic guide sends readers to the calculator on the scheme's website. Feed it the figures from your latest benefit statement rather than estimates.

What interest rate is used to work out a final salary lump sum?

The cash is not worked out by applying an interest rate to a pot. The scheme converts pension into cash at its own commutation factor, such as the LGPS's 12 to 1, and HMRC's limit values the pension with a fixed factor of 20. A transfer value is a different calculation, covered in how a transfer value is worked out.

Is it worth giving up some pension for a bigger lump sum?

That turns on things only you know, such as your health, your other income and who relies on the pension. Cash within HMRC's limits is tax free, while the pension you keep is taxed as income. Both the LGPS and the Civil Service guide let you take less than the maximum, which leaves a bigger pension.

Does a bigger lump sum change my partner's pension?

The LGPS says any survivor pension paid to your partner or eligible children will not be affected. The Civil Service guide says an exchange will not generally affect the way dependants' pensions are worked out. Check your own scheme's rules.

Can I take a final salary lump sum at 55?

The lump sum comes with the pension, so it follows the pension's age rules. HMRC's normal minimum pension age is 55, and 57 from 6 April 2028, apart from ill-health cases and protected pension ages, and each scheme sets the age it actually pays from. How schemes reduce a pension paid early is in early retirement reductions; the wider rules are in taking a pension at 55.

Your next step

A final salary lump sum comes from an automatic formula, a swap at the scheme's rate, or both, and is capped at a quarter of the notional value of pension plus cash. Your scheme can quote the maximum for your record, and you can ask whether a lump sum is on offer at all; to hear it explained for your own position, ask for a call-back on the form here and the adviser, who is FCA-authorised, rings you at no cost. Cashing in the pension entirely is a different question, covered in can I cash in my final salary pension.

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