Guarantor Mortgages in Australia: Complete Guide for Families
- A guarantor provides security (using their own property equity) to help a family member buy a home with a smaller deposit — and typically avoid LMI.
- The guarantor is liable for the guaranteed amount if the borrower defaults. This can put the guarantor's own home at risk.
- Most lenders allow limited guarantees — the guarantor's liability is capped at a specific amount rather than the entire loan.
- Guarantors can typically be released once the borrower builds sufficient equity (usually when LVR reaches 80%).
- A guarantor arrangement affects the guarantor's credit file and can reduce their own borrowing capacity.
- Both parties must receive independent legal advice before proceeding — this is a lender requirement, not just a recommendation.
For first home buyers who have a steady income and the ability to service a loan, but haven't yet saved a full deposit, a guarantor mortgage can be the difference between buying now and waiting another three to five years. But the arrangement carries significant responsibilities — and risks — for the guarantor. Both parties need to go into it with clear eyes.
How a Guarantor Mortgage Works
In a standard home loan, the borrower provides a deposit (typically 5-20%) and the property itself serves as security for the loan. In a guarantor arrangement, the guarantor (usually a parent, and in some cases a sibling or close relative) provides additional security from their own property equity.
This additional security enables the lender to approve a loan they might otherwise decline or to waive LMI on a loan where the borrower's deposit is below 20%.
A Common Guarantor Scenario
Worked Example Emma wants to buy a $650,000 property. She has saved $45,000 — about 6.9% of the purchase price. Ordinarily, she would need LMI (estimated at $13,000-$16,000) and her borrowing capacity at this LVR might be marginal. Emma's parents, Michael and Susan, own their own home worth $900,000 with a $400,000 remaining mortgage — giving them $500,000 in equity. They agree to provide a limited guarantee of $85,000 (the difference between Emma's $45,000 deposit and the $130,000 required for a 20% deposit). The lender now has effective security equivalent to a 20% deposit, LMI is waived, and Emma's loan is approved. Michael and Susan's guarantee is limited to $85,000 — not Emma's full $605,000 loan.
Limited vs Unlimited Guarantees
There are two types of guarantee structure:
Limited (Partial) Guarantee
The guarantor's liability is capped at a specific dollar amount or a specific portion of the property. In the example above, Michael and Susan's liability is capped at $85,000. If Emma defaults and the property sells for less than the outstanding loan, the lender can only pursue Michael and Susan for up to $85,000 — not for Emma's entire loan balance.
Most lenders now offer limited guarantees as the standard, and these are strongly recommended over unlimited guarantees.
Unlimited Guarantee
The guarantor is liable for the entire loan amount if the borrower defaults. This is rarely used in modern residential lending but can appear in older or commercial contexts. If a lender ever requests an unlimited guarantee, seek independent legal advice immediately before signing anything.
Risks for the Guarantor — A Straight-Talking Assessment
Anyone considering becoming a guarantor must understand the concrete risks:
Your property can be repossessed
If the borrower defaults and the lender cannot recover the full outstanding amount from selling the borrower's property, the lender can pursue the guarantor for the guaranteed amount. If the guarantor cannot pay in cash, the lender can seek to force a sale of the guarantor's property to recover the shortfall.
Your borrowing capacity is affected
The guaranteed amount appears on your credit file as a contingent liability. If you apply for a loan yourself — to renovate, refinance, or purchase another property — lenders will see the guarantee and factor it into your serviceability assessment. Your borrowing capacity could be reduced by the full guaranteed amount.
Your credit score may be affected
The guarantee appears on your credit report for the duration of the arrangement. It does not negatively affect your credit score in the same way a missed payment would, but it is visible to any lender who checks your file.
Family relationships can be strained
If the borrower misses repayments or falls into financial difficulty, and the guarantor is called upon, this can create lasting tension between family members. Both parties should have an honest conversation about what happens in a worst-case scenario before signing.
How to Be Released as a Guarantor
A guarantee is not permanent. In most cases, the guarantor can apply to be released once:
The borrower has built sufficient equity in the property — typically once the LVR reaches 80% or below.
The borrower has demonstrated 12-24 months of satisfactory repayments.
The lender is satisfied the borrower can service the loan independently.
To be released, the borrower typically needs to refinance or have the guarantee formally removed by the lender. This may require a new property valuation. The process takes time and requires lender approval — it is not automatic.
In practice, rising property values accelerate the path to guarantee release. If property values increase significantly after purchase, the borrower's LVR may fall below 80% more quickly than anticipated through repayments alone.
What Lenders Require from Guarantors
Lenders assess the guarantor's financial position carefully before accepting them. Standard requirements include:
Proof of the property being offered as security (title search, valuation)
Evidence of the guarantor's own loan balance (if any) on that property
Guarantor's income and expense documentation (payslips, tax returns, bank statements)
Credit history check of the guarantor
Confirmation that the guarantor has received independent legal advice
Independent Legal Advice: Not Optional Every lender requires guarantors to sign a certificate confirming they have received independent legal advice — meaning advice from a solicitor who is not also acting for the borrower or the lender. This is not just a box-ticking exercise. A solicitor will explain the guarantee terms, your liability, your rights, and the consequences of default. Never sign a guarantee without going through this step with an independent solicitor.
Alternatives to a Guarantor Arrangement
If a guarantor arrangement isn't suitable for your family situation, consider these alternatives:
First Home Guarantee (federal government scheme): First home buyers can purchase with 5% deposit and no LMI, with the government guaranteeing up to 15%. No family member is placed at risk.
Family Home Guarantee: Allows eligible single parents with at least one dependent to buy with a 2% deposit and no LMI. No guarantor required.
Gifted deposit: Parents gift part of the deposit outright rather than providing a guarantee. The gift becomes part of the borrower's deposit — parents have no ongoing liability. Lenders require a statutory declaration confirming the gift is not repayable.
Shared ownership: Parents co-purchase the property, sharing in both the loan obligations and any capital growth. A more complex arrangement that requires a co-borrower agreement and consideration of each party's CGT position on sale.
Frequently Asked Questions
Can anyone be a guarantor, or must it be a parent?
Most lenders require the guarantor to be a close family member — parents are the most common, followed by siblings. Some lenders accept other relatives or de facto partners on a case-by-case basis. Friends and non-family members are generally not accepted as guarantors.
Does the guarantor need to own their property outright?
No. The guarantor only needs sufficient equity in their property — the difference between the property's value and their outstanding loan. The equity available to guarantee must cover the required guarantee amount.
What if the property value falls and the borrower owes more than it's worth?
In this scenario, the lender would pursue both the borrower and the guarantor (up to the guarantee limit) to recover the shortfall. This is the worst-case outcome and the core risk of the arrangement.
Can a guarantor be released early if the borrower makes extra repayments?
Yes — if the borrower significantly accelerates loan repayment and the LVR falls below 80% ahead of schedule, they can apply for an earlier guarantee release. The lender will need to confirm the new LVR through a valuation.
Disclaimer: This article is general information only. Guarantor arrangements have significant legal and financial consequences for all parties. Both the borrower and the guarantor should obtain independent legal advice and speak with a qualified mortgage broker before entering any guarantor arrangement.
Written by Luke Drake | Authorised Credit Representative (CRN: 565112) | Frontier Finance Co