UK Couple Tax Calculator

The UK does not have joint filing — every spouse and civil partner is taxed separately as an individual. Each gets their own £12,570 Personal Allowance, their own basic-rate band, and their own NI threshold. The only joint mechanism is Marriage Allowance: if one partner earns less than £12,570, they can transfer £1,260 of unused PA to a basic-rate-paying partner, saving up to £252/year.

Not directly through the tax system — UK tax is individual, so you cannot 'split' salary between spouses to dodge the higher-rate band. But couples can equalise jointly-held investments (savings interest, dividends, rental income on jointly-owned property) so each partner uses their own allowances. They can also claim Marriage Allowance, share ISA contributions for two £20k allowances, and time pension contributions to keep the higher earner below the £100k Personal Allowance taper or the £60k HICBC threshold.

Marriage Allowance lets a non-tax-paying spouse transfer £1,260 of their Personal Allowance to a basic-rate-paying spouse (England/Wales/NI) or up to the intermediate-rate cap in Scotland. The recipient saves £252/year (£1,260 × 20%). Both years pay the same — £1,260 transferable, £252 saving — because the headline allowance is frozen until April 2028. You can backdate a claim by up to 4 years, so claiming in 2025-26 may yield a one-off £1,242 lump sum if all 4 prior years were eligible.

HICBC is charged on the higher earner in the household, regardless of which partner actually receives Child Benefit. The charge tapers from £60,000 (1% per £200 of income above) to a 100% clawback at £80,000. From April 2026 onwards HMRC plans to let households opt for HICBC to be collected via PAYE rather than Self Assessment. Until then, the higher earner must register for Self Assessment as long as Child Benefit is being claimed and they earn ≥ £60,000.

Tax residency for Scottish income tax follows where you live, not where you work — you cannot 'choose' your jurisdiction by employer location. For most couples earning above the higher-rate threshold, Scottish income tax is materially more expensive than English/Welsh/NI rates (top rate 48% vs 45%, higher rate 42% vs 40%, intermediate 21% in Scotland adds friction at £26-43k). For a couple grossing £75k+ each, the differential can be £4,000+ per year combined.

The Couple Tax Calculator models two separate people, each with their own £12,570 Personal Allowance, their own NI threshold, their own student loan reckoning, and the option to transfer Marriage Allowance between them. The Two Jobs Calculator models one person with two employments — a single PA shared across BR/D0/D1/0T tax codes and HMRC's P800 reconciliation at year-end. Different products: 'we' vs 'I have two jobs'.