Almost everything written about a dentist's pension assumes you are inside the NHS Pension Scheme, building guaranteed, inflation-linked benefits year after year. A locum dentist often is not. NHS scheme access for locums is patchy, short or purely private engagements frequently fall outside it, and a locum trading through a company finds that dividends are not pensionable. The result is a retirement gap that the NHS pension pages simply do not address, and one that compounds quietly across a career if it is left unmanaged.

This guide is about filling that gap. We explain how private pensions and SIPPs work for a self-employed locum, how tax relief at source and the higher-rate top-up turn pension saving into one of the most tax-efficient moves a locum can make, and the two limits that govern how much you can put in: the £60,000 annual allowance and the 100%-of-earnings cap for 2025/26. We also cover carry-forward and, if you trade through a company, employer contributions, which are often the best route of all.

Why a locum's pension is a gap, not a given

A salaried dentist or a settled associate usually has a clear NHS pension position. A locum's is fragmented. You might pension some NHS work on the practitioner basis through a practice's contract, but a chunk of your engagements, short cover, private clinics, work through a company, will not be pensionable. If you incorporate and extract dividends, those dividends never count towards an NHS pension. So a typical locum reaches mid-career with far less guaranteed pension than a scheme colleague, and the difference only shows up decades later when it is hardest to fix.

The remedy is to treat your pension as something you build deliberately, not something that happens automatically through employment. For a locum, that means private provision, layered on top of whatever genuine NHS access you have.

When a locum can and cannot use the NHS scheme

It is worth being clear about the NHS side first, because it changes how much private provision you need. Where you perform NHS work directly and the practice can pension it, you may build practitioner accrual on that income. Where your work is private, irregular, or routed through your own company as dividends, it is not pensionable. Our overview of the NHS pension scheme for dentists explains the 2015 scheme and the practitioner basis. The practical message for a locum is to confirm exactly which of your engagements are pensionable, and to assume the rest are a gap you fill privately.

The cost of starting late

The reason this matters so much for locums specifically is the arithmetic of compounding. A pension contribution made in your late twenties has three or four decades to grow before retirement; the same contribution made in your forties has half that, and has to be far larger to reach the same destination. A salaried colleague in the NHS scheme is, in effect, forced to start early because the deduction is automatic. A locum, with no automatic deduction, can drift for years intending to start, and every year of drift is disproportionately expensive because it is an early, high-compounding year lost. The single most valuable thing a locum can do for their retirement is not to pick the perfect fund or time the market; it is simply to start, even modestly, and let time do the heavy lifting. A small regular contribution begun now beats a large one promised later.

Personal pensions and SIPPs: the basics

The main private route is a personal pension or self-invested personal pension (SIPP). You make contributions, the contributions attract tax relief, and the pot is invested until you draw it from age 55, rising to 57. A SIPP suits a locum particularly well because it is flexible and portable: it belongs to you, not to any practice or contract, so it travels with you across every engagement and survives any change in your working pattern. You control the contribution level, increasing it in good years and easing off in lean ones.

Tax relief at source and the higher-rate top-up

This is what makes pension saving so efficient. When you pay into a personal pension or SIPP, the provider claims basic-rate relief at 20% from HMRC and adds it to your pot. Pay in £4,000 of your own money and the provider adds £1,000, making a £5,000 gross contribution. If you are a higher or additional-rate taxpayer, you claim the extra relief through your Self Assessment return, a further 20% or 25% of the grossed-up amount. A higher-rate locum therefore gets effective relief of 40% on a pension contribution, which is hard to beat anywhere else in the tax system. Our guide to pension contributions and tax relief for dentists works through claiming the top-up.

The annual allowance and the earnings cap

Two limits govern how much you can usefully pay in, and you have to satisfy both.

  • The annual allowance is £60,000 for 2025/26, covering all your pension inputs combined, personal, SIPP, any NHS accrual and any employer contributions. It tapers where your threshold income exceeds £200,000 and adjusted income exceeds £260,000, down to a floor of £10,000. Few locums reach the taper.
  • Personal contributions get tax relief only up to 100% of your relevant UK earnings, or £3,600 gross if you earn less than that.

For most locums the binding limit is the earnings cap, not the £60,000 allowance, because typical locum profit is well under £60,000. In practice you can put your whole year's earnings into a pension with relief, but no more from a personal account. Plan contributions around your actual earnings for the year.

Carry-forward: useful, but it does not lift the earnings cap

Carry-forward lets you use unused annual allowance from the previous three tax years, current year first, provided you were a pension scheme member in those years. It is helpful for a one-off high-income year or a catch-up contribution. But carry-forward only raises the annual allowance ceiling, not the earnings cap. A locum can only get relief on personal contributions up to their relevant earnings in the contribution year, so carry-forward helps only if your earnings that year are high enough to support the larger gross contribution. For company employer contributions, the earnings cap does not apply, which is the next point.

If you trade through a company: employer contributions

If you operate through a limited company, employer pension contributions are usually the most efficient route of all. The company pays into your pension directly, and the contribution is:

  • Deductible for corporation tax on a paid basis, reducing the company's tax bill.
  • Free of National Insurance, unlike salary.
  • Not limited by your salary in the way personal relief is capped at 100% of earnings, because it is an employer contribution.

It is still subject to the £60,000 annual allowance and carry-forward, and it must be commercially justifiable as part of your remuneration. For a locum company, directing profit into an employer pension contribution often beats taking a dividend, paying dividend tax at 10.75% or 35.75%, and then contributing personally. If your structure decision is still open, our guide to a limited company versus sole trader for a locum sets out when a company is worth having at all, and pension efficiency is one of the points in its favour.

Defined contribution versus the NHS defined benefit: what you are replacing

It helps to be honest about what a private pension is and is not. The NHS pension is a defined benefit: it promises a guaranteed, inflation-linked income in retirement, calculated from your pensionable pay, with the investment risk carried by the scheme, not by you. That guarantee is extremely valuable and hard to replicate. A personal pension or SIPP is a defined contribution pot: its eventual value depends on what you pay in and how the investments perform, so the risk and the upside both sit with you.

The practical consequence is that a locum filling an NHS gap with private provision generally needs to contribute more than the headline NHS contribution rate to stand a chance of matching the same retirement income, because they are buying an uncertain pot rather than a guaranteed promise. This is not a reason to avoid private pensions, which remain one of the most tax-efficient savings vehicles available. It is a reason to take the contribution level seriously and not assume that simply having a SIPP, lightly funded, is equivalent to a colleague's NHS accrual. Where you have genuine NHS access, take it, because the guarantee is worth more than the equivalent cash; then use the private pension to fill what the NHS scheme cannot reach.

Contributing on a variable income

A locum's income swings from month to month and year to year, which makes pension saving harder to sustain than it is for a salaried colleague with a steady deduction. Three habits help. First, set a regular standing contribution at a level you can maintain even in a quieter month, so the pension is funded continuously rather than in fits and starts. Second, make opportunistic top-ups in strong years, especially years when more of your income falls in the higher-rate band, because that is when the relief is most valuable. Third, time larger contributions deliberately: a top-up made before the tax year end can use that year's relief, and where your income has spiked, a one-off contribution can pull income back out of the higher band as well as building the pot.

Because the earnings cap is measured per tax year, a locum cannot make up a poor earning year later with a giant personal contribution unless their earnings in the later year support it. That is another argument for steady funding: you cannot bank unused earnings the way carry-forward banks unused allowance. The discipline of regular contributions, automated so they survive a variable income, is what separates locums who retire comfortably from those who keep meaning to start.

Drawing the pension later and the tax-free lump sum

Looking ahead, a defined contribution pension can normally be accessed from age 55, rising to 57 from 2028, with up to 25% available as a tax-free lump sum (subject to the overall limits that apply to large pots) and the rest taxed as income when drawn. The flexibility is a genuine advantage over the NHS scheme's fixed retirement terms: a locum can phase withdrawals to manage their tax band in retirement, drawing more in low-income years and less in high-income ones. The flip side, and the reason for the money purchase warning below, is that touching the pot too early can restrict your ability to keep contributing. So treat early access as a retirement decision, not a cash-flow convenience while you are still building.

The money purchase annual allowance trap

One trap to avoid while you are still building. If you flexibly access a defined contribution pension, for example by taking taxable income from a drawdown pot, you trigger the money purchase annual allowance of £10,000, which sharply restricts how much you can later contribute to a defined contribution pension with relief. A locum who dips into a personal pension early can quietly cap their own future contributions. If you are still in the accumulation phase, do not flexibly access any pot until you have finished contributing.

Workplace pensions, auto-enrolment and the locum

One route that catches some locums out, in a good way, is auto-enrolment through any employment they hold alongside their self-employed work. A locum who also does some salaried dental work, a part-time community or hospital post, an associate role structured as employment, or any PAYE job, may be automatically enrolled into a workplace pension, with employer contributions on top of their own. That employer contribution is effectively free money towards retirement and should not be opted out of without good reason. Auto-enrolment does not reach your self-employed income, which is precisely why a purely self-employed locum has to build their own provision, but where you have a mix of employed and self-employed work, the employed slice may quietly be building a pension you should make the most of.

The general lesson is to map all your income streams against pension provision: which are NHS-pensionable, which carry an auto-enrolment workplace pension, and which are bare self-employed income with no pension attached unless you act. The last category is the gap a SIPP fills, and for many locums it is the largest slice of their earnings.

Coordinating pensions with the rest of your tax planning

Pension contributions do not sit in isolation; they interact with the rest of a locum's tax position, often helpfully. A gross pension contribution extends your basic-rate band, which is the mechanism behind higher-rate relief, and that same effect can pull your income back below sensitive thresholds. A locum whose income strays just over £100,000 loses personal allowance at an effective 60% marginal rate on that slice, and a well-timed pension contribution can reclaim it. A locum with children in the child benefit charge zone can use a contribution to reduce adjusted net income and soften or remove the charge. None of this changes the pension rules, but it means a contribution often does double duty, building retirement savings and trimming a marginal tax trap at the same time. This is exactly the kind of coordination a dental accountant adds, setting the contribution level not just for retirement but for its knock-on effect on your wider bill.

How much should a locum put away?

There is no universal figure, but the logic is clear: because a locum lacks the guaranteed NHS pension a scheme member builds, you generally need to save more privately to reach the same retirement income. A workable approach is to set a regular contribution as a percentage of profit, automate it so it happens regardless of a variable income, use higher-rate relief whenever you are in the higher band, and top up in strong years. Because a locum's income swings, the discipline of a standing monthly contribution plus opportunistic top-ups tends to work better than waiting for a perfect year that never quite arrives.

A worked example

Take a locum with £60,000 of profit who decides to contribute £20,000 gross to a SIPP.

  • They pay in £16,000 of their own money.
  • The provider adds £4,000 of basic-rate relief at source, making the gross contribution £20,000.
  • Because part of their income is in the higher-rate band, they claim a further slice of higher-rate relief through Self Assessment, reducing their tax bill.
  • The £20,000 gross is within both the £60,000 annual allowance and the 100%-of-earnings cap, so it all qualifies.

The net cost of putting £20,000 into the pension is therefore well below £16,000 once the higher-rate relief is counted, which is the efficiency the relief-at-source system delivers.

Common mistakes locums make with pensions

A handful of errors recur often enough to be worth naming. The first is doing nothing, assuming there will be time to sort it out later, which is the most expensive mistake of all because of lost compounding. The second is over-contributing from a personal account beyond relevant earnings, which gets no relief and ties money up inefficiently; if you want to put in more than your earnings support and you have a company, the employer route is the answer, not a larger personal contribution. The third is opting out of an auto-enrolment workplace pension attached to a salaried side-role, which throws away free employer money. The fourth is triggering the money purchase annual allowance by flexibly accessing a pot too early while still building. And the fifth is treating the SIPP as equivalent to the NHS pension without funding it to a level that reflects the loss of a guaranteed, inflation-linked benefit.

Every one of these is avoidable with a little planning, and most are avoided simply by setting up a regular contribution early and reviewing it annually with your accountant. The locums who reach retirement comfortably are rarely the ones who found a clever trick; they are the ones who avoided the obvious mistakes and stayed consistent.

Putting it together

  • Confirm which of your engagements are genuinely NHS-pensionable, and treat the rest as a gap to fill privately.
  • Use a personal pension or SIPP for flexibility and portability across engagements.
  • Claim higher-rate relief through Self Assessment whenever you are in the higher band.
  • Watch the 100%-of-earnings cap, which usually binds before the £60,000 annual allowance for a locum.
  • If you have a company, prefer employer contributions: corporation-tax-deductible, no National Insurance, not capped by salary.
  • Avoid triggering the £10,000 money purchase annual allowance while still building.
  • Use a dental accountant for the tax side and a regulated adviser for the pension product itself.

A locum's working pattern is built for flexibility, and so is a private pension. The danger is not that good options do not exist, it is that without an employer quietly building your pension for you, nobody does it unless you do. Set up a regular, tax-relieved contribution early, fill the gap the NHS scheme leaves, and your retirement will not depend on the patchy pensionability of a locum career.