How UK Marriage Allowance works
Marriage Allowance is an Income Tax relief provision established under Section 55A of the Income Tax Act 2007. It is designed to assist married couples and registered civil partners where one partner does not utilise their entire tax-free allowance.
Under the scheme, the lower-earning partner applies to transfer exactly 10% of the standard Personal Allowance (£1,260) to their spouse or civil partner. The recipient receives a tax credit worth 20% of the transferred amount (£252.00 in annual tax reduction).
Once approved by HMRC, the transfer remains in place automatically for subsequent tax years until cancelled, or until a change in circumstances (such as divorce, civil partnership dissolution, or income exceeding the basic rate band) makes either partner ineligible.
Worked example of Marriage Allowance tax savings
Suppose Partner A earns £8,000.00 annually from part-time work, and Partner B earns £28,000.00 as an employed basic rate taxpayer in England. Partner A elects to transfer £1,260.00 of their Personal Allowance to Partner B, and they also backdate the claim for 4 previous qualifying years.
Because Partner A's income of £8,000.00 is well below their reduced Personal Allowance of £11,310.00 (£12,570 minus £1,260), Partner A incurs £0.00 in tax cost.
Partner B's tax code receives an allowance boost of £1,260.00, reducing their taxable income and generating £252.00 in annual tax relief. Across 4 backdated years, Partner B receives a £1,008.00 backdated tax rebate lump sum from HMRC, creating a total Marriage Allowance tax saving of £1,260.00 for the household.
Eligibility criteria and restrictions
To qualify for Marriage Allowance, three fundamental criteria must be met during the relevant tax year:
First, you must be married or in a registered civil partnership (cohabiting couples do not qualify regardless of how long they have lived together).
Second, one partner must generally earn less than the standard Personal Allowance (£12,570). If their income is slightly above £11,310, they can still transfer, but they will begin paying basic rate tax on the income above £11,310.
Third, the higher-earning partner must be a basic rate taxpayer (earning between £12,571 and £50,270 in England, Wales, or Northern Ireland). If the higher earner pays higher rate (40%) or additional rate (45%) tax, the couple is not eligible.
When Marriage Allowance is approved, HMRC updates the recipient's tax code to include an 'M' suffix and the transferring partner to 'N'. Use our tax code calculator to verify how your take-home pay is affected.
To see your full income tax and national insurance breakdown for the tax year, visit the tax calculator.
Scottish taxpayers and Marriage Allowance
In Scotland, income tax bands differ from the rest of the UK. For Scottish taxpayers, the recipient spouse must pay the Scottish Starter rate (19%), Basic rate (20%), or Intermediate rate (21%).
If the higher-earning partner pays the Scottish higher rate (42%), advanced rate (45%), or top rate (48%), they cannot claim Marriage Allowance.
The tax credit value remains capped at the standard 20% basic rate (£252.00) regardless of whether the recipient falls into the Scottish intermediate rate.
Inputs for the Marriage Allowance calculator
Tax year
The UK tax year for the claim (running from 6 April to 5 April).
Lower earner annual income
The gross annual earnings or pension income of the lower-earning partner (must normally be £12,570 or less).
Higher earner annual income
The gross annual earnings of the higher-earning partner (must be between £12,571 and £50,270 for basic rate status).
Years to backdate claim (0 to 4)
The number of prior tax years for which you wish to backdate your claim (HMRC allows backdating up to 4 previous tax years).
Tax region
Select England, Northern Ireland & Wales, or Scotland (where devolved tax bands determine basic rate eligibility).
CALCULATOR QUESTIONS
Marriage allowance calculator questions
Can I claim Marriage Allowance if we are cohabiting but not married?
No. Under Section 55A of the Income Tax Act 2007, you must be legally married or in a registered civil partnership. Living together, regardless of duration, does not meet statutory eligibility.
How do we receive the money from HMRC?
For the current and future tax years, the higher earner receives the tax cut through an adjusted PAYE tax code (adding the 'M' suffix to their code) or via their Self Assessment return. Any backdated claim for previous years is paid directly to the higher earner as a lump sum bank transfer or cheque by HMRC.
Can I claim Marriage Allowance if one partner has died?
Yes. You can backdate a Marriage Allowance claim up to four tax years for a deceased spouse or civil partner, provided all eligibility criteria were satisfied during those tax years.
Who must make the application to HMRC?
The lower-earning partner (the person transferring part of their allowance) must apply to transfer the allowance to their spouse. The recipient partner cannot apply on their behalf.