How do you coordinate withdrawals to use both personal allowances?
A couple has two personal allowances worth £25,140 of tax-free income between them, and each one expires annually. The most common and most expensive planning error in UK retirement is drawing a household's whole income from one partner's pension while the other's allowance goes unused.
- The prize: £25,140 a year of household income with no Income Tax at all.
- The waste: an unused allowance cannot be carried forward or transferred, beyond the £1,260 Marriage Allowance.
- The fix: balance pension pots between partners during the accumulation years, not after.
- The tool: a non-earning spouse can contribute £3,600 gross a year to a pension regardless of income.
Tom and his wife retired with £430,000 between them — £390,000 of it in his SIPP, because his employer's scheme was where all the matching was. Drawing £30,000 a year from his pot alone cost them tax that £25,140 of balanced withdrawals would not have.
01 Why the imbalance happens
Pension wealth accumulates where the employment was, and UK households rarely split earnings evenly across a career. Auto-enrolment attaches contributions to the earner; employer matching multiplies whatever the higher earner puts in; and career breaks for childcare land almost entirely on one partner. The result is a household with two allowances and one pot.
The imbalance is invisible during accumulation because the household total looks fine. It becomes expensive at the moment of decumulation, and by then the fix — moving money between the two — is much harder, because pension rights cannot simply be transferred between spouses outside a divorce settlement.
This is why the useful version of this advice is aimed at people who have not retired yet. Contributions missed on one side of a household are not just missing growth; they are a missing tax allowance for every year of retirement.
Source: Workplace pensions
02 What two allowances are worth
Two personal allowances shelter £25,140 of income a year. On a thirty-year retirement, using both rather than one is worth over £150,000 in tax at the basic rate alone, and more where the concentration pushes the drawing partner into the higher-rate band.
The gap widens once the State Pension starts, because that income is fixed and unavoidable. A household where both partners have a full State Pension has roughly £25,100 of it arriving before any private pension is touched, which uses most of both allowances. A household where one partner has a full record and the other has gaps has the same total income arriving into a single allowance.
Which makes the National Insurance record of the lower earner a tax question as well as a benefits one.
Shows: the Income Tax a household pays drawing its income from one pension against splitting it across two personal allowances. Ignores: Scottish rates, the State Pension, whether both partners actually have pensions to draw from, and National Insurance.
On the defaults above, the worked example shows £2,514. Drawing it all from one pension costs £3,486; splitting it evenly costs £972.
03 The £3,600 rule
Anyone under 75 can contribute £2,880 net — £3,600 gross after basic-rate relief — to a pension regardless of their earnings, including someone with no income at all. For a non-earning spouse this is the only route to building a pot in their own name, and the relief is genuine: the government adds £720 to £2,880 for someone who paid no tax.
Over ten years that is £36,000 gross plus growth, in the name of the partner who will otherwise have an empty allowance. It is not a large pot; it does not need to be. Its job is to give the lower-earning partner something to draw against their own allowance, and £36,000 drawn at £3,600 a year covers a decade of it.
The contribution has to be made from the couple's money into the non-earner's own pension. It is their asset from that point, which is the legal reality of the arrangement and worth being clear about before making it.
Source: Pension tax relief
04 Marriage Allowance, and its limits
Where one partner has income below the personal allowance and the other is a basic-rate taxpayer, Marriage Allowance lets £1,260 of allowance be transferred, worth £252 a year. It can be backdated four tax years, so a first claim is often worth around £1,250.
Its limits are strict. The recipient must be a basic-rate taxpayer — a higher-rate taxpayer cannot benefit — and only £1,260 of the £12,570 can move. It is a partial patch on the problem rather than a solution to it, and it is worth claiming precisely because it is small enough to be forgotten.
The larger version of the same idea does not exist: allowances are individual and non-transferable beyond this, which is why balancing the underlying assets is the only real answer.
Source: Marriage Allowance
05 What to do at each stage
Before retirement, direct discretionary contributions toward the partner with the smaller pot, once any employer match on the larger side has been captured — the match is worth more than the allowance balancing, so it comes first. Use the £3,600 route for a non-earning partner. Check both National Insurance records and fill gaps on the weaker one.
At retirement, draw from both pensions up to both allowances before either partner pays tax. Use ISAs to top up whichever partner would otherwise cross a threshold. Claim Marriage Allowance if one of you is under the allowance and the other is a basic-rate taxpayer.
And revisit it annually, because the State Pensions starting at different dates change the arithmetic in the year each one begins.
Source: Plan your retirement income
This is the most expensive avoidable mistake I see in UK households, and it is invisible until it is too late to fix cheaply. Pension money cannot be moved between spouses on retirement, so the balancing has to happen while contributions are still being made — which means the decision belongs to people in their forties, not their sixties. If one of you has a large pot and the other has almost nothing, direct every discretionary pound to the smaller side once the employer match is captured. And if one of you does not work, £2,880 a year into their pension buys £3,600 and, eventually, an allowance worth far more than the relief.
FAQ
Can I transfer pension money to my spouse?
No, not outside a divorce settlement. Pension rights belong to the individual, which is why the balancing has to happen through contributions during accumulation rather than through transfers at retirement.
Can my non-earning spouse really get tax relief?
Yes. Anyone under 75 can contribute £2,880 net a year and receive £720 of basic-rate relief regardless of earnings, so £3,600 goes into the pot. It is the only pension relief available to someone with no taxable income.
Is Marriage Allowance worth claiming?
Yes where it applies — £252 a year, backdatable four years — but it moves only £1,260 of allowance and the recipient must be a basic-rate taxpayer. It is a patch on the problem, not a substitute for balancing the underlying pots.
What if one of us has much larger pension savings already?
Draw from both up to both allowances anyway, using ISAs and the smaller pot to fill the lower-earning partner's allowance first. Where the smaller pot is genuinely empty, the £3,600 route can still build something before retirement, and Marriage Allowance covers part of the rest.
Sources
Regulator references
- Workplace pensions · GOV.UK · 2025The statutory auto-enrolment framework and who it covers.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
- Pension tax relief · GOV.UK · 2025How relief at source and net pay differ, and the earnings limit on relief.Last verified: 2026-09-07
- Marriage Allowance · GOV.UK · 2025The transfer amount and the eligibility test used here.Last verified: 2026-09-07
- Plan your retirement income · GOV.UK · 2025The government's own sequence for turning pension pots into income.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.