The legal paperwork for buying a home together asks a narrower question than the one that actually matters. A conveyancer will ask how you want your ownership interests recorded, but that question sits downstream of several others that are considerably harder to answer well under time pressure during a purchase — which is exactly when many co-buyers end up having to answer them.
How much does each person really own? Does a larger deposit mean a larger share of the property? What happens if one of you later wants to sell and the other does not? If one person pays substantially more towards the mortgage or improvements, does that change anything? And if one owner dies, should their interest pass automatically to the other owner or form part of their estate?
The legal structure matters. But it works best when it formalises decisions you have already made together rather than becoming the point at which you discover you had different assumptions all along.
Start with the money, because it may not be equal
Co-buyers do not always contribute to a purchase in the same way. One person might have a larger deposit, perhaps because they have saved for longer or received money from family. One may earn more and expect to cover a greater share of the mortgage. Later, one owner might fund a new kitchen, extension or other substantial improvement while the other contributes more towards day-to-day household costs. None of that is inherently a problem. The difficulty comes when people leave the arrangement undiscussed, assume it will somehow balance out, or discover years later that they remembered the agreement differently.
Before you get anywhere near exchange, it is worth establishing who is contributing what to the deposit and whether money coming from outside the purchase — particularly from parents or other relatives — is intended as a gift, a loan or something that should affect the buyers’ respective interests in the property. The same conversation should cover the mortgage. Are repayments going to be divided equally regardless of income, proportionally according to earnings, or in some other way you have agreed? And crucially, does paying more towards the mortgage mean that person acquires a larger interest in the property, or are the ownership proportions intended to remain fixed?
Those are different questions. A couple might agree when they buy that one owns a greater share because they contributed much more of the deposit, then pay the mortgage equally for the next ten years. One owner might later fund a substantial extension. Or somebody might temporarily cover all of the mortgage because the other loses their job or cannot work. Buyers should decide whether payments of that kind are simply part of their shared household arrangement, money expected to be repaid, or something intended to alter their respective financial interests. It is much easier to answer that before the money has been spent.
There is also an important distinction between the arrangement between the buyers and their responsibility to the lender. With a joint mortgage, agreeing privately that one person will pay 40% and the other 60% does not normally limit either borrower’s responsibility for the debt. MoneyHelper explains that each borrower on a joint loan or mortgage can be responsible for repaying the whole debt. If one person stops making the contribution they agreed between themselves, the other may therefore still have to make sure the mortgage payment is met. MoneyHelper — Your financial position in a new relationship
Buyers should think about losses as well as gains. An arrangement saying that one person’s larger deposit will be returned to them first is not necessarily the same as agreeing fixed ownership percentages. If one buyer puts in £80,000 and the other £20,000, “we own the property 80:20” produces a different result from “we each get our original deposit back and divide whatever remains equally”. A substantial rise in value may make that difference very noticeable, but so can a fall in value. If there is not enough equity after repaying the mortgage and selling costs to return everyone’s original contribution, the agreement needs to make sense in that situation too.
There are no universally right answers to these questions. Reasonable co-buyers reach very different arrangements depending on their relationship, finances and priorities. What matters is reaching an explicit answer together rather than relying on an assumption that turns out not to be shared.
The scenarios worth discussing before they happen
A handful of situations come up often enough in co-buying that they are worth talking through in advance, even though none of them feels particularly pressing while you are excited about a purchase.
What happens if one of you wants to sell and the other does not? Circumstances change. One owner might need to relocate, release money tied up in the property or simply decide that continuing to own it no longer suits them. Having some understanding of how you would deal with that — whether the remaining owner would have an opportunity to buy the other’s interest, how the property would be valued and what sort of timeframe would apply — is considerably easier before a disagreement exists.
Any proposed buy-out also has to work in the real world. If there is a mortgage, transferring the home into one person’s name will normally depend on the lender agreeing and being satisfied that the remaining borrower can afford the loan. An agreement between the owners can set out what they would like to happen, but it cannot by itself require a lender to release one of them from the mortgage.
What happens if the relationship changes? For couples, that may mean separation. For friends or siblings, it could mean a falling-out or simply reaching a point where each wants something different from the property. What happens if one owner moves out but wants to retain their interest? Who then pays the mortgage and other property costs? What if one person later wants a new partner to move in? Thinking through these possibilities does not mean expecting the relationship to fail. It means deciding what the financial arrangement is before circumstances make that conversation considerably harder.
Death raises a different question. Do you want the surviving owner to benefit automatically, or should each person’s interest be capable of passing to children, relatives or somebody else? For buyers in second relationships, or anyone with children from an earlier relationship, that can be particularly important. Where the chosen ownership structure allows a person’s share to pass through their estate, their will should support what they actually intend to happen.
| Decision to settle | What you actually need to agree |
|---|---|
| Deposit | Who is putting in what, and should unequal contributions affect ownership? |
| Mortgage | How will repayments be shared, and does paying more change ownership? |
| Later spending | What happens if one person funds major improvements or mortgage overpayments? |
| Financial difficulty | If one owner temporarily pays more because the other cannot, how will that be treated? |
| Selling | What happens if one owner wants to sell and the other wants to stay? |
| Buy-out | How will the property be valued and how long does the remaining owner have to arrange finance? |
| Losses and costs | How will selling costs or a fall in the property’s value affect what each person receives? |
| Death | Should the survivor benefit automatically, or should each person’s interest pass through their estate? |
You do not need to negotiate an elaborate contract for every hypothetical situation before you start viewing homes. But where substantial money is being contributed unequally, or the intended arrangement is more complicated than simply owning and paying for everything equally, these conversations become considerably more important.
Where the legal structure comes in — and why it matters more than the form-filling suggests
In England and Wales, there is a distinction between being named as a legal owner of the property and the underlying financial interest in it. Where two people buy together, the legal title is held jointly; what they usually need to decide is how the beneficial interest — in practical terms, the financial ownership underneath that title — is held. HM Land Registry’s guidance for people who own property together explains that distinction and why the title register does not simply show each person’s underlying percentage share. HM Land Registry — Owning land and property with someone else
This is where the familiar choice between joint tenants and tenants in common matters. Beneficial joint tenants do not have separate defined shares, and if one dies their interest passes automatically to the surviving joint owner or owners. Tenants in common have separate shares, which can be equal or unequal, and an owner’s share can pass through their estate rather than automatically to the other owner.
That choice interacts directly with everything discussed earlier in this article. If two buyers intend to own the property in unequal proportions, or want something more complicated to happen to the sale proceeds, their conveyancer needs to know. HM Land Registry’s guidance for completing the TR1 transfer form specifically provides for joint owners to record whether they intend to hold the beneficial interest jointly, in equal shares or in unequal shares, and notes that recording those intentions can help avoid disputes later. HM Land Registry — Guidance for completing form TR1
Northern Ireland also uses the concepts of joint tenancy and tenancy in common, although it operates its own land-registration system. The Northern Ireland Land Registry describes joint tenants as owning together with the survivor taking the interest on death, while tenants in common hold stated shares that can pass through the deceased owner’s estate. Northern Ireland Land Registry — Glossary of terms
Scotland uses different terminology and buyers should not assume the England and Wales language translates directly. Scottish co-owned property can be held in separate pro indiviso shares, while a title may also contain a survivorship destination or survivorship clause under which a deceased co-owner’s share passes automatically to the survivor. Registers of Scotland advises owners to check the wording of the title because that can determine what happens following a co-owner’s death. Registers of Scotland — If you co-own property with someone who has died
The practical questions are therefore similar throughout the UK — who should benefit from the property, in what proportions and what should happen if circumstances change — but the legal machinery used to achieve that differs. Buyers should take advice under the law applying where the property is located rather than assuming terminology from one UK jurisdiction works identically in another.
If your contributions differ, don’t leave the ownership arrangement undocumented
Unequal contributions do not automatically mean every pair of buyers needs a lengthy separate declaration of trust. A straightforward arrangement in England and Wales may be capable of being recorded during the conveyancing process: for example, that two buyers hold the beneficial interest as tenants in common in specified proportions.
The need for more detailed drafting becomes clearer when the agreement cannot sensibly be reduced to a simple percentage. “We own the property 60:40” is comparatively straightforward. “One person’s deposit is returned first, certain renovation spending is then taken into account, the mortgage and selling costs are deducted and whatever remains is divided equally” is a different kind of arrangement.
A declaration of trust, sometimes called a deed of trust, can be used to record a more detailed agreement about the beneficial interests and how money should be divided. The important point for the ordinary buyer is not that every unequal deposit requires the same document. It is that if your intended financial arrangement is more complicated than the ownership structure recorded during the purchase, you should not assume conversations, bank transfers and everybody’s memory of what was agreed will be enough to settle it years later.
That is particularly important for unmarried couples in England and Wales. Unlike divorce or dissolution, there is currently no equivalent overarching statutory regime for dividing the property and finances of cohabitants when they separate; disputes may instead have to be resolved through property and trust law. The government consulted in 2026 on possible stronger protections for cohabitants, but those proposals have not changed the law currently applying to buyers. Ministry of Justice — A fairer end to relationships
Marriage or civil partnership does not make careful ownership planning irrelevant, but it does bring a different legal framework into play if the relationship later ends. Where the contributions, family circumstances or intended ownership arrangements are complicated, advice should therefore reflect both the property purchase and the buyers’ own circumstances.
What this article isn’t trying to do
The detailed legal mechanics of joint tenancy versus tenants in common, how a declaration of trust should be drafted, what happens when ownership is disputed and how jointly owned property is dealt with following separation or death all deserve fuller treatment of their own.
The point of working through the questions above before you get to that stage is that the legal paperwork can then reflect decisions you have already made together, rather than decisions your conveyancer is trying to extract from you for the first time while a purchase is already moving.
Buying with someone else — whether a partner, friend, sibling or parent and adult child — works best when the financial and practical arrangement is something you have actually discussed and agreed, not something you have assumed matches theirs. The legal structure your conveyancer puts in place should be the formal expression of that understanding — not the first time you each discover what the other expected.
This article provides general property information, not legal advice for your individual circumstances. Co-ownership law and the protections available to co-owners vary across the UK and depend on individual circumstances. Take independent legal advice, ideally before you commit to a purchase, if contributions are unequal, the proposed ownership arrangement is complex or you are unsure how your interests should be recorded.
