For many married couples and civil partners, the simplest way to claim Marriage Allowance to save tax is also one of the most frequently missed. It is not a complicated relief, but it does depend on the right combination of incomes. Where one partner has unused Personal Allowance and the other pays tax at the basic rate, a claim can reduce the household’s tax bill by up to £252 a year.
That may not transform a business cashflow forecast on its own, but tax planning often works best when practical savings are not left behind. Marriage Allowance is particularly relevant for families where one person works part-time, takes time away from work, runs a small side business or has recently retired.
What is Marriage Allowance?
Marriage Allowance lets one spouse or civil partner transfer part of their unused Personal Allowance to the other. The Personal Allowance is the amount of income someone can normally receive before paying Income Tax.
The transfer is currently £1,260. It does not mean the recipient gets an extra £1,260 tax-free in the usual sense. Instead, it gives them a tax reduction worth up to 20% of that amount – currently up to £252 for the tax year.
The partner making the transfer gives up that portion of their own allowance. Their tax-free allowance is therefore reduced by £1,260, while their spouse or civil partner receives the corresponding tax benefit.
For a couple where the transferring partner has little or no taxable income, this is usually a straightforward household saving. Where their income is close to the Personal Allowance, it is worth checking the numbers before applying.
Who can claim Marriage Allowance to save tax?
You must be married or in a civil partnership. Couples who live together but are not married or civil partners cannot claim, regardless of how long they have shared a household.
The person transferring allowance will normally need income below the standard Personal Allowance, currently £12,570. This could include employment income, self-employment profits, pension income, rental income and certain taxable benefits.
The receiving partner must pay Income Tax at the basic rate. For most taxpayers in England, Wales and Northern Ireland, this generally means their income falls between the Personal Allowance and the higher-rate threshold. Scottish taxpayers have different Income Tax bands, but Marriage Allowance can still be available where the receiving partner is a starter, basic or intermediate-rate taxpayer.
The allowance is intended for couples born on or after 6 April 1935. If either partner was born before that date, Married Couple’s Allowance may be the relevant relief instead. It works differently and should not be confused with Marriage Allowance.
Eligibility is assessed individually, so business owners should take particular care. A director’s modest salary may suggest that they qualify to transfer allowance, but dividends, rental profits, bank interest or other income can change the result. Equally, a self-employed person may have low profits in one year and higher profits in the next.
A simple example
Suppose Alex has income of £8,000 and Morgan has a salary of £30,000. Alex has unused Personal Allowance and can transfer £1,260 to Morgan. Morgan is a basic-rate taxpayer, so the transfer can reduce Morgan’s Income Tax by £252.
The result is a full household tax saving of £252 because Alex’s income remains comfortably below the reduced allowance.
Now consider a different position. If Alex earns £12,200, transferring £1,260 reduces Alex’s allowance to £11,310. Alex may then pay tax on part of their income. Morgan can still receive the tax reduction, but the overall household gain will be lower. The claim may still be worthwhile, but it should be calculated rather than assumed.
How to make a Marriage Allowance claim
The partner with the lower income makes the application through HMRC. In most cases, the claim can be made online using both partners’ National Insurance numbers and identification details.
Once HMRC accepts the application, the tax benefit is usually reflected through the receiving partner’s PAYE tax code. If they complete a Self Assessment tax return, the relief may instead be dealt with through the tax calculation.
A claim normally continues in future tax years unless the couple’s circumstances change or it is cancelled. That makes it convenient, but it also means it should be reviewed. A promotion, a profitable trading year, new rental income or a dividend payment can mean the transferring partner no longer has sufficient unused allowance.
If you are already completing Self Assessment, include the relevant information accurately and retain records of the income figures used. For directors and self-employed taxpayers, the right answer is based on total taxable income, not simply the salary paid from a company or the money withdrawn from a business bank account.
Do not overlook backdated claims
One of the most useful features of Marriage Allowance is that eligible couples can usually backdate a claim for up to four previous tax years. The amount available depends on the allowance and tax position in each of those years, so it will not necessarily match the current maximum.
Backdating can be valuable where a couple did not know the relief existed, or where one partner had a period of lower income due to parental leave, part-time work, illness, retirement or a change in business circumstances. HMRC will consider the historic eligibility conditions for each year claimed.
This is also where a quick review can prevent disappointment. If the higher-earning partner was a higher-rate taxpayer in a previous year, that year may not qualify even if the couple qualify now. Similarly, income that was overlooked at the time, such as dividends or property income, can affect the result.
When Marriage Allowance may not be the best answer
Marriage Allowance is valuable, but it is not automatic tax planning for every couple. The key trade-off is the transferor’s reduced Personal Allowance.
It may be less attractive when the lower-earning partner’s income sits just below £12,570. They may have some tax to pay after the transfer, reducing the net saving for the couple. It can also be unsuitable if their income is likely to rise during the year, perhaps because a sole trader expects a stronger final quarter or a company director plans to take additional dividends.
There can be practical administration to consider too. If PAYE codes are wrong or income changes mid-year, the tax position may be corrected later through PAYE, Self Assessment or an HMRC calculation. That does not usually remove entitlement, but it can affect when the benefit is received.
For couples with more complex income, Marriage Allowance should be considered alongside the wider position. Pension contributions, dividend planning, salary levels, property income and the timing of capital gains can all influence Income Tax. The best approach is not to chase a single relief in isolation, but to make sure the household’s allowances and tax bands are working together.
A practical check for business owners and families
Before applying, look at each partner’s expected taxable income for the year. Include employment income, business profits, dividends, pensions, rental profits and taxable savings where relevant. Then consider whether the lower-income partner will remain below their reduced allowance after the transfer.
This check is particularly useful after a change in circumstances. Starting a new role, ceasing self-employment, taking maternity or paternity leave, retiring, drawing a pension or altering a company remuneration strategy can all create an opportunity – or remove one.
At RK & Co, we regularly find that personal tax savings are easier to identify when they are reviewed alongside business accounts and future plans, rather than only when a tax return is due. A short conversation before the year-end can be more useful than discovering an avoidable tax cost afterwards.
If your income has changed, take a few minutes to check whether Marriage Allowance fits your circumstances. Small, timely decisions can leave more of your household income available for the plans that matter to you.