Using a family member's property to back your business loan

Sometimes the person with the equity isn’t the person with the business. A parent with a paid-off house, a sibling with an investment property, an adult child doing well. When they offer to help, it comes from a good place. It also carries real risk for them, and it deserves the most careful version of the decision.

How does a guarantor second mortgage work?

The business, or you personally, is the borrower. The family member gives a guarantee, which is a promise to pay if the borrower doesn’t, and supports it with a mortgage over their property. If the loan is repaid as planned, nothing happens to their property. If it isn’t, the lender can turn to the guarantor, and if necessary to their property.

The guarantor doesn’t run the business, doesn’t control the cash flow and may not see warning signs until late. That imbalance is why guarantor arrangements need extra care.

What risks does the guarantor take on?

Moneysmart’s guidance on going guarantor, updated in 2026, sets out the main risks plainly:

• They may have to repay the guaranteed amount, plus interest and costs, if the borrower can’t.
• Their home or other assets could be at risk.
• A default can appear on their credit report and affect their own future borrowing.
• Existing guarantees can count against them when they apply for credit.
• Money problems can strain relationships.

None of these are reasons to refuse automatically. They are reasons to go in with eyes open.

What should a guarantor see before signing?

Moneysmart suggests that for business loans, a guarantor should ask for the business plan and cash flow forecasts, recent financial statements, the borrower’s credit report and details of the security. We’d add the exit:

1. What the money is for, and why property security is needed.
2. The amount, and the amount they’re guaranteeing (which may be less).
3. How it will be repaid, by when, and the fallback.
4. The worst realistic case, explained honestly.
5. The loan documents, including fees, term and what happens at maturity.
6. How they’ll be kept informed while the loan runs.

If you’d find it awkward to share any of this with them, that’s worth noticing.

Which safeguards make the most difference?

Safeguard	Why it helps
Limited guarantee (a set dollar cap)	Caps what the guarantor can be asked to pay
Comfortable equity cushion on their property	Reduces the chance of a forced outcome
Specific exit with a fallback	Gives the loan a natural end date
Independent legal advice for the guarantor	Ensures they understand what they sign
Agreed release point	Sets out when the guarantee will be removed
Regular updates from you	Avoids nasty surprises

Independent legal advice deserves emphasis. The guarantor should get it from their own lawyer, not yours, and they should feel free to walk away afterwards. Moneysmart notes that a guarantee may be challenged if the guarantor was pressured, misled or didn’t understand what they were signing. Good advice protects everyone.

If you and your family member have worked through these safeguards and still want to go ahead, you can send a short enquiry setting out who owns the property and how much they’re comfortable guaranteeing.

Are there gentler ways for family to help?

Before a guarantee, consider whether one of these would do:

• A family loan of cash, documented properly. Their maximum loss is the amount lent, and their home stays clear.
• A smaller guarantee alongside your own property or another source.
• An equity stake in the business rather than a guarantee. They share upside and downside, with no mortgage. See taking on an investor.
• A shorter-term guarantee that falls away once a refinance is in place.

Planning the release from day one

A guarantee shouldn’t be open-ended. Agree up front how it ends:

• On repayment of the second mortgage from a sale or refinance.
• On refinance into a loan that doesn’t need their property.
• On a reduced balance, if the lender agrees to release the guarantee once the loan falls below an agreed level.

Write the expected release date down alongside the exit plan, and treat it as a promise to them.

If something goes wrong

If the business hits trouble, tell your guarantor early. They’ll find out eventually, and hearing it from you, with a plan, preserves trust. Lenders are generally more flexible when problems are raised early. Our page on what happens if things go wrong covers the options.

What should you tell other family members?

When parents guarantee one child’s business borrowing, siblings sometimes find out later and feel the family home was put at risk without them knowing. You can’t control how others feel, but openness helps. It’s worth the guarantor considering whether to tell other family members, and how a call on the guarantee would affect their own plans, such as an inheritance or care arrangements. These are personal decisions, but better made deliberately than by default.

Ask the right questions together

If a family member is offering their property, the best next step is a conversation that includes them. Send a short enquiry, note that a guarantor’s property is involved, and one specialist will talk it through with you both. There’s no credit check when you first enquire and your details stay with that one person. Please give accurate details of the property, its owners, what’s owed on it and the amount you’re considering, so the guidance you get is relevant from the start.

Talk through a family-backed loan →