How do you handle irregular freelance income when funding a pension?
Freelance income arrives unevenly, and the two rules that govern pension contributions respond to that differently: carry-forward lets a good year use three years of unused allowance, while the earnings limit caps a bad year at that year's profit. Planning around both means contributing a small amount monthly and sizing the real contribution once the year's figures exist.
- The floor: £3,600 gross a year is available regardless of earnings.
- The ceiling: 100% of relevant earnings, capped by the £60,000 annual allowance.
- Carry-forward: three years of unused allowance, but only if you were a scheme member in them.
- The pattern: monthly base for the habit, annual top-up for the accuracy.
Tom does consultancy work now, and his profit has ranged from £19,000 to £84,000 across four years. The advice that works for a salary — contribute a fixed percentage monthly — is close to useless on that pattern.
01 Two rules that behave differently
The earnings limit caps relievable contributions at 100% of your relevant UK earnings for the tax year. The annual allowance caps them at £60,000, with unused allowance from the previous three years available by carry-forward. Both apply, and the lower one binds.
Across a variable income they diverge sharply. A year with £19,000 of profit allows a £19,000 contribution however much unused allowance has accumulated, because the earnings limit binds first. A year with £84,000 of profit can absorb far more than £60,000 if carry-forward is available.
The consequence is that good years are worth much more than bad ones for pension purposes, and the planning follows the income rather than smoothing it.
It also means an averaging instinct is wrong. Someone whose profit alternates between £20,000 and £80,000 does not have an average of £50,000 for these purposes: they have one year capped at £20,000 and one year able to absorb far more. Contributing £25,000 in each year would be unrelieved in the first and under-used in the second.
Shows: the largest relievable contribution for a year, given the earnings limit and any carry-forward available. Ignores: the money purchase annual allowance, the taper, scheme membership in earlier years, and your cash position.
On the defaults above, the worked example shows £84,000. The earnings limit binds: carry-forward is available but relievable contributions stop at this year's profit of £84,000.
02 Preserving carry-forward through the thin years
Carry-forward requires you to have been a member of a registered pension scheme in each year you carry forward from, even if you contributed nothing at all in that year. Membership preserves the allowance; the absence of a scheme loses it.
For a freelancer, that means keeping a SIPP open through a year with no income rather than closing it. The cost is nothing, and the benefit is up to £60,000 of allowance that remains available in a later good year.
It is the single cheapest piece of pension planning available to anyone with variable income, and it is invisible until the year you need it — which is why it gets missed.
03 The £3,600 floor
Anyone under 75 can contribute £2,880 net a year and receive £720 of basic-rate relief, giving £3,600 gross, regardless of earnings. It applies to a year with no profit at all, and it applies to a non-earning spouse.
That gives a freelancer a minimum contribution that is always available and always relieved. It is not a substitute for contributing properly in a good year, but it keeps the habit and the scheme membership alive through a thin one.
Relief on this is genuine even where no tax has been paid, which is the unusual feature: the government adds £720 to a contribution made by someone with no tax liability at all.
Source: Pension tax relief
04 Sizing the top-up
Once the year's profit is visible, work out the band boundary below it and contribute the difference if the cash allows. Profit of £62,000 taken down to £50,270 gets 40% relief on the whole slice; the same money contributed against £30,000 of profit gets 20%.
Where profit is high and carry-forward is available, the contribution can exceed £60,000. Check the three preceding years first, because the amounts available are the unused allowance in each, not a blanket £180,000.
The contribution has to be paid inside the tax year to count for it, and relief is given for the year of payment rather than the year the profit relates to. That makes March the operative month for anyone whose figures are only clear by then.
One caution on very large contributions in a single year. The relief is real but the money is locked until 55, and a freelancer's next twelve months are less predictable than an employee's. A contribution that is correct on the tax arithmetic and wrong on the cash position is still the wrong contribution.
05 Cash flow and the safety margin
Contributions are irreversible, and a freelancer's next six months are not guaranteed. Keeping a cash buffer outside the pension is not a failure of discipline; it is what makes the contribution affordable at all — a pension you cannot access until 55 is no help in a quarter with no work.
The usual structure is a working cash reserve of several months' costs, a tax reserve for the January and July payments on account, and pension contributions from what remains. Contributing before the tax reserve is filled is the mistake that produces a January problem.
Payments on account are worth understanding here, because a contribution reduces the eventual liability without reducing a payment on account already calculated on last year's profit.
The reserve also has a second job. A freelancer with cash available can decline badly priced work, and that option is worth more over a career than the marginal relief on an extra contribution. Fund the reserve first and treat the pension as the destination for what genuinely exceeds it.
Source: Self Assessment tax returns
Keep the SIPP open in the years you earn nothing. That is the whole trick, and it costs you nothing at all. Carry-forward is only available for years in which you were a member of a registered scheme, so a freelancer who closes a pension during a lean patch loses up to £60,000 of allowance for each year they were outside one — and finds out about it in the good year, when it is too late. Beyond that: small monthly contribution for the habit, single top-up in March sized to the actual profit, and never contribute before the tax reserve is filled.
FAQ
Can I contribute more than I earned this year?
Not with relief. Contributions are limited to 100% of relevant UK earnings for the tax year, or £3,600 gross if that is higher. Carry-forward raises the annual allowance ceiling but does nothing to the earnings limit, so a low-profit year caps you at that year's profit.
Do I lose carry-forward in a year with no income?
Only if you were not a member of a registered pension scheme in that year. Membership with no contributions preserves the allowance; being outside a scheme entirely loses it. Keeping a SIPP open through a lean year is therefore worth doing even at zero contributions.
When in the year should I contribute?
A small monthly amount for consistency, then a top-up once the year's profit is visible — usually in the final quarter. Relief is given for the tax year in which the contribution is paid, so the top-up has to be made before 5 April.
Should I contribute before setting aside my tax money?
No. Pension contributions are irreversible and the January payment is not optional. Fill the tax reserve and a working cash buffer first; contribute from what is genuinely surplus.
Sources
Regulator references
- Annual allowance on pension savings · GOV.UK · 2025The annual allowance, the money purchase allowance and how they interact.Last verified: 2026-09-07
- Check if you have unused annual allowances · HM Revenue and Customs · 2025The three-year carry-forward mechanics used in the worked example.Last verified: 2026-09-07
- Pension tax relief · GOV.UK · 2025How relief at source and net pay differ, and the earnings limit on relief.Last verified: 2026-09-07
- Income Tax rates and Personal Allowances · GOV.UK · 2025The band boundaries every figure in this post is calculated against.Last verified: 2026-09-07
- Self Assessment tax returns · GOV.UK · 2025Filing and payment deadlines that constrain the timing advice here.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.