Carry forward. Decoded.

How UK pension carry forward actually works

Carry forward is the rule that lets you contribute more than the standard £60,000 Annual Allowance into a UK pension in a single tax year, by drawing on unused allowance from the previous three tax years. In the best case — three full years of £60k unused plus the current year's £60k — that's a £240,000 maximum contribution in one go. It's HMRC's relief valve for irregular income: bonuses, business sales, late-career catch-ups.

The mechanics are unambiguous but easy to get wrong. You must use the current year's allowance in full before any carry forward can apply — there's no "save this year's, use last year's" sleight of hand. After the current year is fully used, the earliest unused lookback year is consumed first, then the next, then the most recent. This ordering matters because allowance more than 3 years old expires, so HMRC make sure you use the about-to-expire year before the newer ones. The calculator above follows this ordering automatically.

The membership requirement

You can only carry forward from a tax year in which you were a member of a UK-registered pension scheme. Membership counts even if you contributed nothing in that year — a dormant SIPP with £0 in it is enough. People moving to the UK from abroad are caught by this: if you weren't a member of any UK pension scheme in 2023/24, you can't carry forward from 2023/24 in 2026/27, regardless of how much "unused allowance" the headline numbers suggest.

The tapered Annual Allowance

If your adjusted income exceeds £260,000 in a given tax year (the threshold was £240,000 before 6 April 2023), your AA tapers by £1 for every £2 of adjusted income above £260,000, to a minimum of £10,000 (at adjusted income of £360,000+). The threshold income test (currently £200,000) is a let-out: if your threshold income is at or below £200,000, the taper doesn't apply, regardless of adjusted income. Both income measures have specific HMRC definitions — they're not the same as your salary or your taxable income.

For carry forward purposes, you use the tapered AA that actually applied to you in each year, not the standard £60,000. If a high-earning year reduced your AA to £20,000 and you contributed £18,000, only £2,000 is available to carry forward from that year — not £42,000.

The MPAA — the silent carry-forward killer

The Money Purchase Annual Allowance is triggered the first time you take taxable income from a defined-contribution pension other than via tax-free cash, scheme pension or trivial commutation. Once triggered, your DC contributions are capped at £10,000 a year with no carry forward — at all, ever again. This is the single biggest gotcha in UK pension planning: a £100 flexi-access drawdown payment to test a SIPP at 55 can permanently nuke your ability to top up DC contributions later in your career.

If you have both DC and DB pensions and have triggered the MPAA, the situation is messier. Your DC contributions are capped at £10k. Your DB accrual is measured against an "alternative Annual Allowance" of £50,000 (£60,000 standard AA minus the £10,000 MPAA), and you can carry forward unused alternative AA on the DB side. The tool above treats the simple case — DC only with MPAA triggered — and disables carry forward in that mode.

The earnings cap that's separate from the AA

Carry forward lets you exceed the £60k AA. It does not let you exceed the separate earnings cap for tax-relievable personal contributions. You can only get tax relief on personal contributions up to 100% of your UK relevant earnings in the same tax year (or £3,600, whichever is higher). So a high earner with one big bonus year typically uses carry forward via an employer contribution — often a salary sacrifice of the bonus — because employer contributions are constrained only by the AA, not by the earnings cap.

Things this tool deliberately doesn't model

• Defined benefit (DB) accrual. The "pension input amount" for a DB scheme is 16 × the increase in your annual pension over the year (plus revaluation). This calculator assumes DC contributions only. If you have a DB scheme, your scheme administrator will send you an annual statement with the pension input amount — plug that in as your "contribution" figure.
• Public-service-scheme remedy (McCloud). If you're affected by the McCloud judgment in NHS/Teachers/Police/Firefighter schemes, your historical AA usage may have been adjusted. Use the figures from your remediable service statement.
• Scheme pays. If your AA charge is over £2,000, you can ask the scheme to pay it out of your pension. Doesn't affect what's available to carry forward in future years, but does affect your eventual fund value.
• Anti-forestalling rules. Special rules apply if you significantly increased contributions in anticipation of a known rate change. Rare, but real.