A guarantor home loan in Australia is a mortgage arrangement where a third party — usually a parent or close family member — agrees to use their own property as additional security for your loan. This allows you to borrow more than your deposit alone would typically allow, and in many cases, to avoid paying Lenders Mortgage Insurance (LMI) entirely.

Guarantor home loans in Australia are one of the most effective ways for first home buyers to enter the property market sooner. Rather than spending years saving a 20% deposit, a guarantor can bridge the gap — allowing you to buy with as little as 5% or even no deposit at all, depending on the lender and the guarantor’s available equity.

The guarantor does not make repayments on your behalf — they simply agree that if you cannot meet your repayments, the lender can access their property. This is a significant commitment and all parties should seek independent legal and financial advice before proceeding.

Understanding how guarantor home loans work in Australia is essential before proceeding. The arrangement involves three parties — the borrower, the lender and the guarantor — and the structure can vary depending on the lender and type of guarantee offered.

The Basic Structure

When you apply for a guarantor home loan in Australia, you borrow the full purchase price (or close to it) from the lender. Your guarantor provides their property as additional security for the portion of your loan that exceeds 80% of the property value — the portion that would normally attract LMI. The lender holds a mortgage over both your property and the guarantor’s property for the guaranteed amount.

How the Guarantee Is Calculated

Most lenders structure guarantor home loans in Australia as a limited guarantee — meaning the guarantor is only responsible for a specific portion of the debt, not the full loan amount. For example, if you are buying a $600,000 property with a 5% deposit ($30,000), you need to borrow $570,000. Without a guarantor, the lender charges LMI because you are borrowing above 80% LVR. With a guarantor, the lender takes a $90,000 limited guarantee over the guarantor’s property to cover the LVR shortfall — capping the guarantor’s risk at $90,000, not $570,000. Use our LMI Calculator to see exactly how much you would save.

When the Guarantor Is Released

The guarantor is not locked in forever. Once your loan balance reduces to 80% or less of the property value — through repayments, property value growth or both — you can apply to have the guarantor released. Most lenders process this as a loan variation taking 4–6 weeks. Use our Extra Repayment Calculator to see how quickly you can reach the 80% LVR threshold and release your guarantor.

1. Confirm Your Guarantor Has Sufficient Equity

The most fundamental requirement for guarantor home loans in Australia is that your guarantor has enough usable equity in their property. Most lenders require the guarantor’s property to have enough equity to cover the guaranteed amount after their own mortgage balance. Use our Home Equity Calculator to estimate how much equity your guarantor has available.

2. Choose a Limited Guarantee Over a Full Guarantee

Always insist on a limited guarantee rather than a full guarantee. A limited guarantee caps the guarantor’s liability to the specific amount needed to reduce your LVR to 80%, rather than making them responsible for your entire loan. All lenders listed in this guide offer limited guarantee structures for guarantor home loans in Australia.

3. Compare the Comparison Rate — Not Just the Headline Rate

When comparing guarantor home loans in Australia, always look at the comparison rate rather than the advertised rate. The comparison rate includes fees and charges and gives a truer picture of the total loan cost. Use our Loan Comparison Calculator to compare any two lenders side by side.

4. Plan Your Guarantor Release Strategy From Day One

Before signing any guarantor home loan in Australia, understand exactly what conditions are needed for your guarantor to be released — what LVR is required, how long it takes and what fees apply. Making extra repayments from day one is the most effective release strategy. See our Extra Repayment Calculator for a personalised timeline.

Limited Security Guarantee

The most common type of guarantor home loan in Australia. The guarantor’s liability is capped at a specific dollar amount — typically the portion of the loan above 80% LVR. This is the safest structure for guarantors and is offered by all major Australian banks. Always insist on a limited security guarantee.

Full Guarantee

Less common and generally not recommended. In a full guarantee, the guarantor is liable for the entire loan amount if the borrower defaults. Some smaller lenders still offer this structure but the risk to the guarantor is significant. If a lender only offers a full guarantee, consider finding a lender that offers a limited guarantee instead.

Family Pledge / Family Security Guarantee

Branded products offered by CommBank, Westpac, St.George and Bank of Melbourne specifically designed for parent-to-child guarantor arrangements. These products have streamlined processes, clearly defined limited guarantee structures and transparent guarantor release processes — making them some of the most straightforward guarantor home loan options in Australia.

Government Guarantee Schemes

Separate to family guarantor loans, the Australian Government offers guarantee schemes including the First Home Guarantee (5% deposit, no LMI) and the Family Home Guarantee (2% deposit for single parents). These are government-backed alternatives that may eliminate the need for a family guarantor entirely. See our guide on the First Home Guarantee for full details.

Borrower Eligibility

• Be at least 18 years of age and an Australian resident or citizen
• Have a regular, verifiable income sufficient to service the loan repayments
• Pass the lender’s credit assessment independently — a guarantor does not compensate for bad credit
• Have at least some genuine savings — most lenders require 5% genuine savings even with a guarantor
• Intend to use the property as a primary residence (some lenders also allow investment)

Guarantor Eligibility

• Be an immediate family member — parent, sibling, spouse or de facto partner in most cases
• Own property in Australia with sufficient equity to cover the guaranteed amount
• Pass the lender’s credit and serviceability assessment independently
• Be able to service the guaranteed amount if the borrower defaults
• Not currently be under financial hardship, bankruptcy or a debt arrangement
• Obtain independent legal advice — most lenders require a solicitor’s certificate

Guarantor home loans in Australia remain one of the most effective ways for first home buyers to enter the property market sooner — particularly in high-price cities where saving a 20% deposit can take a decade or more. By using a family member’s property equity as additional security, you can avoid LMI, borrow with a smaller deposit and get into the market years ahead of schedule.

The best guarantor home loan in Australia for most first home buyers is CommBank’s Family Pledge or Westpac’s Family Security Guarantee — both offer clearly structured limited guarantees, transparent release processes and competitive rates. For borrowers who prefer lower rates without needing a physical branch, Macquarie and ING consistently offer sharp rates with guarantor-compatible products.

Whichever lender you choose, the most important steps are ensuring your guarantor fully understands their obligations, that both parties obtain independent legal advice, and that you have a clear plan to release the guarantor as quickly as possible. Use our free Extra Repayment Calculator to map out your release timeline before you even apply.

For independent guidance on guarantor home loans in Australia, visit ASIC MoneySmart — Australia’s official free financial information service.