Buying a home together: ownership shares and mortgage liability

Katerina Galkina · EN · 07/10/2026

Separate ownership from mortgage debt

A property share and the obligation to repay a mortgage are different issues. An agreement to own 70/30 does not by itself limit liability to the lender in those proportions. With a joint loan, each borrower is generally responsible for the whole debt, as MoneyHelper explains ↗.

Before making an offer, discuss who will be registered as an owner, who will borrow and who pays the deposit and purchase costs. Marriage does not replace checking the paperwork, and regular payments to a partner do not automatically document a clear ownership share.

Choose the ownership arrangement

For England and Wales, GOV.UK distinguishes joint tenants and tenants in common ↗. Joint tenants have equal rights to the whole property; on death the ownership passes to the other joint owners and cannot pass under a will. Tenants in common can hold different shares; a deceased owner's share does not automatically pass to the other owner and can be left by will.

Do not automatically apply this explanation to Scotland or Northern Ireland: obtain local legal advice. Ask the conveyancer to explain the consequences for your family, including children from previous relationships and any foreign wills.

Record the agreement before completion

Where contributions differ, discuss a declaration of trust and, where appropriate, a cohabitation agreement. The lawyer should check that the documents are compatible with the mortgage. A private agreement between partners does not alter the lender's contractual rights.

Record whether deposits are returned first, how increases or decreases in value are shared, and whether renovation spending or later payments affect entitlement. Agree how a buyout will be valued, the sale timetable and what happens if one partner stops contributing. Review wills and insurance at the same time: an agreement about contributions does not resolve every issue arising from death or lost income.

Check any later ownership changes separately

Adding a partner to the title, removing a borrower and changing the type of joint ownership are different transactions. A fee-free change from joint tenancy to tenancy in common at Land Registry does not mean that transferring a share is free or that a borrower automatically leaves the mortgage.

Before transferring ownership, obtain the lender's position, a legal quotation and a tax assessment. Taking responsibility for mortgage debt can have tax consequences even without a cash payment. If you separate, keep discussing repayments with the lender: a private understanding that the other person will pay does not release a borrower. For disputed ownership rights, consult MoneyHelper's guidance on protecting your home during separation ↗ and obtain individual legal advice.