Guarantor Home Loans: How to Use Family Equity to Buy Your First Home Sooner

Saving a 20% deposit in today’s market can feel like chasing a moving target. A guarantor home loan offers a practical shortcut: a family member uses the equity in their own property to back your loan, letting you buy sooner and avoid Lenders Mortgage Insurance (LMI) altogether.

It’s not risk-free — for either party — but when structured correctly, it’s one of the most effective ways to enter the property market faster.

How a Guarantor Home Loan Works

A guarantor home loan is a standard mortgage where a third party — usually a parent — agrees to secure a portion of your loan using equity in their own property. No money changes hands. The guarantor simply allows the lender to place a charge over part of their property as additional collateral.

In most cases, the guarantee covers the gap between your deposit and 20% of the purchase price — just enough to eliminate LMI, which can run to $15,000–$30,000 on a typical first home loan. Some lenders also allow the guarantee to cover purchase costs such as stamp duty.

Limited Guarantee vs Full Guarantee

Limited Guarantee

A limited guarantee caps the guarantor’s liability at a specific dollar amount — typically the gap needed to reach 80% LVR. If you’re purchasing a $700,000 property with a $70,000 deposit, the guarantor secures exactly $70,000, and no more. Their exposure is defined and their own home is only at risk up to that capped amount. This is the structure most brokers recommend.

Full Guarantee

A full guarantee makes the guarantor liable for the entire loan if you default. This is rarely necessary and carries significant risk. Very few lenders offer it for residential home loans, and most brokers will steer clients toward a limited structure unless there are specific reasons a limited guarantee won’t work.

Who Can Be a Guarantor?

Lender policies vary, but the following are generally accepted:

Parents — the most common; accepted by all major lenders
Grandparents — accepted by most lenders; age may be considered
Siblings — accepted by some lenders as a policy exception
Step-parents and legal guardians — assessed case-by-case

Friends, colleagues, and distant relatives are not accepted. Regardless of relationship, the guarantor must have sufficient usable equity, a stable income, clean credit history, and be prepared to seek independent legal advice — a non-negotiable requirement from all lenders.

Typical Lender Rules to Know

Most major banks restrict guarantors to immediate family (parents being preferred). Specialist lenders have more flexibility for siblings and extended family, often with higher documentation requirements and stricter loan structures. This is one reason working with a broker who has access to a wide lender panel matters — the best guarantee structure for your situation may not be available from your existing bank.

Some lenders also cap the guarantee amount at a percentage of the guarantor’s equity, and many require the guarantor’s existing mortgage (if any) to be with the same lender or a lender on their approved list.

How to Release the Guarantee

The guarantee doesn’t last forever. Once your loan balance drops to 80% of the property’s value — through repayments, capital growth, or lump sum contributions — you can apply to have it released. The process typically involves:

A property valuation to confirm the current market value
Lender confirmation that LVR is at or below 80%
Signing a formal deed of release

Most first home buyers reach this point within 3–7 years, depending on the market and repayment pace. Releasing the guarantee frees the family member’s property from the security arrangement and removes the contingent liability from their credit file.

Is a Guarantor Loan Right for You?

This approach makes strong sense when you have reliable income but haven’t had time to save a full deposit, when property prices are rising faster than you can save, or when you don’t qualify for the First Home Guarantee due to income or price cap constraints. See also our guide on how much deposit you need to understand all your options.

It’s less appropriate if the guarantor is close to retirement, has limited equity, or plans to sell or refinance their own property soon. Always work through the numbers with a broker before committing.

Frequently Asked Questions

Can my parents be guarantor if they still have a mortgage?

Yes. Your parents don’t need to own their home outright — they just need enough usable equity (property value minus outstanding mortgage). A property worth $800,000 with a $300,000 mortgage has $500,000 in equity, a substantial portion of which could support a limited guarantee.

Will a guarantor arrangement affect my parents’ borrowing capacity?

The guarantee shows as a contingent liability on their credit file, which can affect their ability to take on new debt while it’s in place. This reinforces the importance of releasing the guarantee as soon as you reach 80% LVR.

Can I use a guarantor loan for an investment property?

Some lenders allow it, though policies are stricter than for owner-occupied purchases. A broker can identify which lenders on their panel accommodate this structure and what conditions apply.

What happens if I can’t make my repayments?

The lender will first pursue the borrower. If the loan enters genuine default, the lender can then seek recovery from the guarantor up to the limited amount. This is why realistic repayment planning — and a financial buffer — matters before entering this arrangement.

Ready to Explore a Guarantor Loan?

At Lagos Financial, we work with 60+ lenders — including those with more flexible guarantor policies — and will structure an arrangement that works for both you and your guarantor. Our offices in Bondi Junction (Sydney) and Launceston serve clients nationally. Book a complimentary assessment and let’s map out the fastest path to your first home.

Learn more about guarantor home loan options at Lagos Financial.