One partner pays more of the mortgage: does that change who owns what?

If one partner pays more of the mortgage, do they own more of the house?

Not automatically. When one partner pays more of the mortgage, the law in England and Wales treats that as a separate question from who owns the home. This guide covers unmarried couples, and it’s written for both of you: the partner paying more and the partner paying less.

Who owns what depends first on whose names are on the title and what you recorded when you bought:

Your situation	Where you start
Joint names, shares recorded	Your recorded shares
Joint names, nothing recorded	Half each
One partner’s name only	The owner starts with it all

If you recorded your shares, on the transfer form (panel 10 of the TR1) or in a declaration of trust, they usually stay as written. In Pankhania v Chandegra, the Court of Appeal said a written declaration of shares is conclusive unless it’s set aside for something like fraud or mistake, or you later agree something different. Paying more of the mortgage afterwards doesn’t change it by itself.

If you’re in joint names and recorded nothing, the starting point is equal shares, even if one of you pays more. In Jones v Kernott, the Supreme Court said that starting point can change only if there’s evidence you both intended something different, when you bought or later. If a court has to decide, it looks at the whole course of dealing between you. Money paid in counts, but the court said there are many other factors too.

The House of Lords listed some of them in Stack v Dowden: how the purchase was financed, both at the start and later, how you arranged your money, and how you paid the bills for the home and your other household costs. In that case Ms Dowden had paid far more and the couple kept their money strictly separate, and the court upheld a 65/35 split. But it said cases like that would be very unusual. Living together, however long for, doesn’t change any of this: there’s no such thing as common-law marriage. Fewer than half of the people we surveyed (18 of 39) knew that living together doesn’t give you married couples’ rights.

So paying more of the mortgage than your partner isn’t a reliable way to own more. If you want it to change your shares, or you want to be clear that it doesn’t, the answer is the same: agree it together and write it down.

What if the home is in one partner’s name only?

Then the owner starts by owning all of it, and the other partner has no automatic share, however long you’ve lived together.

Paying towards the mortgage can help show that you both intended the other partner to have a share. Advicenow lists mortgage repayments among the contributions that can count, along with paying for repairs and renovation. But it also says gaining a share this way is usually very tricky to prove, and the question is what you both intended, not just who paid.

If you’re paying towards a mortgage in your partner’s name, talk about what it means. Some couples see it as a fair share of the running costs, like rent. Others see it as buying into the home. Either is fine, as long as you both know which, and write it down. Our guide to when your partner owns the house and you’re not on the deeds covers this in detail.

What are your options if one of you pays more, or the joint mortgage is paid by one person?

With a joint mortgage, Citizens Advice says you’re both responsible for the payments, including any arrears, even if one of you moves out. It also says you may be responsible for the whole of a debt in joint names, not just half. How you split it between you is up to you.

There are three common ways couples handle one partner paying more. None is right for everyone.

1. Payments don’t change your shares. You treat the mortgage as a shared cost of living in the home, like rent, whoever pays more of it. Your shares stay as you recorded them. This suits couples who share money in other ways, for example where the partner paying less pays more of the bills or does more of the childcare.

2. Extra capital comes back first. Each monthly payment on a repayment mortgage is part interest and part capital, the bit that pays off what you owe. You keep track of the capital each of you paid, and when you sell, the partner who paid more gets the difference back first. The rest is split by your shares. The interest is treated like rent.

3. Shares adjust by a formula. You agree a formula that changes your shares as you go, for example in proportion to what each of you has put in, counting deposits and capital repaid. This rewards the bigger payer most strongly, but you need to keep good records and agree how to treat gaps, such as a career break.

Whichever you choose, also agree:

• What counts: only the monthly mortgage, or also lump-sum overpayments, improvements and bills.
• What happens during a career break, such as parental leave, illness or retraining. You could agree that shares stay the same, so nobody is penalised.
• What happens if one of you stops paying, and how long before it changes anything.

How does it work with real numbers?

Alex and Jordan aren’t married. They buy a £300,000 home in joint names. Each puts in a £25,000 deposit, so £50,000 in all, and they take a £250,000 joint mortgage costing £1,000 a month.

Alex earns more, so Alex pays £700 a month and Jordan £300. After five years (60 months):

Over 5 years	Alex	Jordan
Deposit	£25,000	£25,000
Mortgage paid	£42,000	£18,000
Of which capital	£14,000	£6,000

Of the £60,000 they paid the lender, we assume £20,000 went to paying off what they owe and the rest was interest. That’s an illustration only: the real figure depends on your rate and term. Your lender’s annual statements show how much you still owe, so you can work out how much you’ve paid off. Because Alex paid 70% of every payment, Alex paid 70% of the capital: £14,000, against Jordan’s £6,000.

They then sell for £330,000 with £230,000 of mortgage left. That leaves £100,000.

Alex and Jordan's £100,000, depending on what they agreed

What they agreed	Alex gets	Jordan gets
Nothing written down	£50,000	£50,000
Payments don't change shares	£50,000	£50,000
Extra capital comes back first	£54,000	£46,000
Shares adjust: deposits plus capital	£55,714	£44,286

How the rows work:

• Nothing written down: the starting point is half each, even though Alex paid £24,000 more to the lender. A court could depart from that only if there was evidence they both intended something different, and it would look at the whole course of dealing, not just the mortgage.
• Payments don’t change shares: the same £50,000 each. The difference from the first row is that they both chose it and wrote it down, so they both know where they stand.
• Extra capital comes back first: Alex paid £8,000 more capital than Jordan (£14,000 less £6,000). Alex gets that £8,000 back first. The remaining £92,000 is split equally, £46,000 each. So Alex gets £54,000 and Jordan £46,000.
• Shares adjust: Alex put in £39,000 (£25,000 deposit plus £14,000 capital) and Jordan £31,000 (£25,000 plus £6,000), £70,000 in all. Alex’s share is £39,000 out of £70,000, about 55.7%, so Alex gets about £55,714 and Jordan about £44,286. Growth in value is shared in the same ratio, which is why Alex gets a little more than in the row above.

The last two rows only work if they own as tenants in common and record the formula, for example in a declaration of trust.

Illustration only: it ignores selling costs, tax and anything else either of you paid. For the deposit side of the picture, try your own numbers in the deposit split calculator.

Is the partner who pays less really paying less?

Not always, and this is where fairness to both of you matters most.

Say Jordan pays £400 a month towards bills and food that Alex doesn’t. Then each of them puts £700 a month into the household: Alex £700 to the mortgage, Jordan £300 to the mortgage and £400 to bills. Over five years, Jordan’s £24,000 on bills exactly matches the £24,000 gap in their mortgage payments (£42,000 less £18,000). Counting only the mortgage would make Alex look like the bigger contributor when they’ve put in the same.

The same applies to time. If one of you works part-time to look after children, or takes a career break, paying less of the mortgage may be the result of a choice you made together. Some couples are happy for shares to adjust. Others agree they won’t, so that whoever steps back isn’t penalised for it.

Courts look at the wider picture too. In Stack v Dowden the House of Lords included how a couple paid their household costs and arranged their money, not just the mortgage. So before you agree a formula, look at everything each of you puts in, not just one bill.

What happens to the mortgage payments if you split up?

If you’re both on the mortgage, you both stay responsible for the payments until the home is sold or the lender agrees to one of you taking over the mortgage. Citizens Advice says that includes arrears, even if one of you moves out.

What happens after you separate can matter for your shares, especially if you recorded nothing. In Jones v Kernott, an unmarried couple bought in joint names in 1985. Mr Kernott moved out in 1993, and Ms Jones stayed with their children and paid all the household expenses herself. When he later claimed a share, the Supreme Court agreed their intentions had changed after he left, and Ms Jones got 90%.

Advicenow says who pays the mortgage after you separate may make a difference to your shares. So:

• Agree in writing who pays the mortgage until you sell or one of you buys the other out.
• Keep records of what each of you pays.
• Agree how it’s balanced. If one of you stays and the other has moved out, Citizens Advice says the one who stays could pay the leaver’s share of the mortgage, sometimes called “occupation rent”.

If you can’t agree, either of you can ask a court to decide under the Trusts of Land and Appointment of Trustees Act 1996. Under section 14 it can declare your shares and order a sale. Under section 15 it must consider things including what you intended and why you bought the home. Advicenow describes these cases as expensive, stressful and uncertain, for both of you. Our guide to what happens to the house if you split up goes through the options.

How do you write down what you agree?

There are two pieces, and they work together.

A declaration of trust records how you own the value of the home: your shares, or a formula such as extra capital back first. The law says a declaration of trust over land has to be shown in signed writing, and a conveyancer or solicitor can prepare one. If you’ve already bought, Advicenow says that if you both agree you can change the shares you each own. One of you can end a joint tenancy alone, but Advicenow says that gives you equal shares, so unequal shares need you both to agree. Advicenow also says it’s a good idea to get help from a solicitor. Our guide to the declaration of trust explains more.

A couples agreement (also called a cohabitation agreement or a house buying agreement) covers the everyday rules a declaration of trust usually doesn’t: how you split the mortgage each month, whether extra payments change anything, what counts, what happens during a career break and what happens if one of you stops paying. Courts can take an agreement like this into account, and Advicenow says they will usually follow one if it’s fair and you were both honest about your finances, and even more so if you each had independent legal advice. See how your agreement counts and what a couples agreement for buying a house covers.

If you’re buying now, choose tenants in common if you want shares that can differ. Advicenow says tenants in common is likely to suit couples paying different amounts towards the deposit or mortgage. Our guide to joint tenants or tenants in common explains the choice. If the deposits were different too, see our guide to a joint mortgage with an unequal deposit.

What should you do next?

1. Check what you’ve already recorded. Look at your TR1 and any declaration of trust, or ask your conveyancer. If you recorded shares, those are your starting point.
2. Talk about what the extra payments mean. Are they a shared cost, money that comes back first, or a change to your shares? The free 10-minute conversation asks how you’ll split the mortgage, side by side, and your answers stay on your device.
3. Look at everything each of you puts in, including bills, childcare and career breaks, not just the mortgage.
4. Write it down in a couples agreement you both sign, and update your declaration of trust if your shares change.
5. Keep records: your lender’s annual statements and bank records of who paid what, especially for lump sums.
6. Review it when something big changes, such as a baby, a pay change or a new mortgage deal.
7. Get legal advice if large sums are involved, the home is in one name, either of you feels under pressure, or you’re separating now. A solicitor for each of you, or a mediator, can help.