29 May 2026 · 5 min read
The short answer
They do different jobs. A declaration of trust is about one thing: who owns what share of a property. A cohabitation agreement is much broader - it sets out how an unmarried couple handles their finances and arrangements generally, both while living together and if they separate. Many couples end up with both: a declaration of trust for the house, and a cohabitation agreement for everything else.
Side by side
| Declaration of trust | Cohabitation agreement | |
|---|---|---|
| Main purpose | Records the beneficial ownership shares in a specific property. | Sets out the couple's wider financial and practical arrangements. |
| What it covers | Deposit, shares, mortgage contributions, what happens on sale. | Property, bills, savings, debts, possessions, and what happens if you split. |
| Tied to the property title | Yes - can underpin a Form A restriction at the Land Registry. | No - it is a contract between the two of you. |
| Legally binding | Yes, and generally conclusive of the ownership shares. | Yes, if properly drafted, signed as a deed, with disclosure and ideally independent advice. |
| Children | No. | Can record intentions, but a court has the final say on child arrangements and maintenance. |
| Best when | You mainly need to sort out ownership of the home. | You want the whole relationship's finances documented. |
Do they overlap?
They can. A cohabitation agreement can refer to how the property is owned, but the declaration of trust is the document that actually records and protects your beneficial shares in the home and links to the Land Registry. Think of the declaration of trust as the precise tool for the property, and the cohabitation agreement as the wider framework around your whole life together.
Which do you need?
If your main concern is making sure the home is owned fairly - say because of unequal deposits - a declaration of trust may be all you need. If you want to cover savings, debts, possessions and what happens to everything if you part ways, add a cohabitation agreement. Plenty of couples sensibly do both. Either way, see why a declaration of trust matters for unmarried couples.
The bottom line
A declaration of trust protects the property; a cohabitation agreement protects the relationship's wider finances. They are complementary, not competing. Sort the home first with a declaration of trust, then decide whether you want the broader cover too.
This article is general information about the law in England and Wales, not legal advice. For your own situation, speak to a qualified solicitor.
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