Buying out a partner on your mortgage

How a buyout works

The two steps are legal and financial. Legally, the partner transfers their share of the property to you, often in exchange for a cash payment. Financially, the joint mortgage is replaced with a sole-name mortgage on the same property. Both steps usually happen at the same time, coordinated by a solicitor.

Affordability is the gatekeeper

What was a two-income mortgage now has to clear on one income. Lenders stress the new payment against your income, your existing commitments and the household running cost. If the gap is small, most cases land. If your single income is materially below the joint income, the case can be tight. We pre-stress before any solicitor work so you know up-front.

Worked example, buying out a partner on a £320,000 home

Property worth £320,000, joint mortgage outstanding £180,000. Equity £140,000, half-share £70,000 owed to the leaving partner. To stay in the property in your sole name, you need a new mortgage of £250,000 (existing £180,000 plus £70,000 buyout). On a £55,000 sole income with no children, that is roughly 4.5x income, which most mainstream lenders will accept. On a £42,000 sole income with one child, the case is tighter, perhaps 5.5x, which needs a specialist lender or a JBSP supporter. We pre-stress before instructing the solicitor.

JBSP as a fallback

If your single income does not clear affordability but a parent, sibling or partner is willing to support the mortgage without owning the property, a JBSP (Joint Borrower Sole Proprietor) structure can sometimes save the case. The supporter is on the mortgage, not on the deed. It is not a small decision, the supporter is liable for the loan, but it is a real route. Plan a remortgage at year three or five to take the supporter off the case once your income has grown.

Capital to pay the partner

If you are paying your partner cash to buy them out, the cash either comes from your own savings, from family, or from increased borrowing on the new mortgage. Adding the buyout cost into the new mortgage is treated as a capital release and is accepted by most lenders for this purpose.

Timing around the divorce or separation

If the buyout is part of a financial settlement on divorce, the lender often wants to see the consent order or settlement agreement. We coordinate with your solicitor so the timing works. Some lenders accept a heads-of-terms before a final consent order; some require the order itself. We pick the right lender for where you are in the process.

Stamp Duty position on a transfer of equity

If your partner transfers their share to you in exchange for cash and the existing mortgage assumption, SDLT is calculated on the value transferred, including any debt taken on. On a divorce-related transfer made under a court order, SDLT relief usually applies, removing the SDLT bill entirely. On a non-divorce transfer between cohabiting partners, SDLT may apply if the consideration crosses the threshold. We work with your solicitor to confirm the position; this is one of the most common sources of unexpected cost on a buyout.

Common pitfalls we see

Starting solicitor work before confirming affordability, then having to halt the legal process. Underestimating the timing risk where the leaving partner needs the cash to fund their own next purchase. Forgetting that the leaving partner credit profile during the transition affects both parties briefly. Not refreshing the mortgage offer if the divorce timetable slips. We sequence all four pieces.