Guarantor Home Loans: The Ultimate Guide

What is a guarantor home loan?

A guarantor home loan is a lending arrangement where a family member — typically a parent — uses equity in their own property as additional security for your home loan. This allows you to borrow more than the property's value would normally support, effectively replacing the deposit you haven't saved yet.

The guarantor doesn't hand over cash. They don't make your repayments. They simply pledge a portion of their property's equity as a safety net for the lender. In return, you can often purchase with as little as 0–5% deposit and avoid Lenders Mortgage Insurance (LMI) entirely.

For many Australian families, this is the most powerful strategy to help the next generation into the property market years earlier than they could manage on their own.

How does a guarantor home loan work?

The mechanics are straightforward, though the legal arrangements require careful setup:

Step 1: Determine the guarantee amount

The guarantee typically covers the difference between your deposit and 20% of the property value, plus a buffer. For example:

• Property price: $800,000
• Your deposit: $40,000 (5%)
• 20% threshold: $160,000
• Gap: $120,000
• Typical guarantee amount: $120,000–$140,000 (including buffer)

Step 2: The lender splits the loan

Most lenders structure a guarantor loan as two separate loan accounts:

1. Main loan: 80% of the property value, secured against your new property only
2. Guaranteed portion: The remaining amount, secured against both your property and the guarantor's property

This split is important because it limits the guarantor's exposure and makes it easier to release the guarantee later.

Step 3: You make all the repayments

The borrower (you) is responsible for all repayments on both loan portions. The guarantor has no ongoing financial obligation unless you default. Their name is on the guarantee, not on the loan.

Step 4: Release the guarantee over time

As you pay down the loan and/or your property increases in value, your LVR improves. Once it reaches 80% or below, you can apply to release the guarantor. The lender will conduct a new valuation and assess your standalone serviceability.

How much can a guarantor loan save you?

Let's run the numbers on a real scenario:

Without a guarantor (5% deposit):

• Property price: $800,000
• Deposit: $40,000
• Loan amount: $760,000 (95% LVR)
• Estimated LMI: ~$28,000
• Total upfront: $40,000 + $28,000 LMI + ~$30,000 stamp duty + ~$4,000 fees = ~$102,000

With a guarantor (5% deposit):

• Property price: $800,000
• Deposit: $40,000
• Loan amount: $760,000 (split into 80% and guaranteed portion)
• LMI: $0
• Total upfront: $40,000 + ~$30,000 stamp duty + ~$4,000 fees = ~$74,000

Saving: approximately $28,000 in LMI

And because there's no LMI capitalised into the loan, your ongoing repayments are also lower.

Types of guarantor arrangements

Limited guarantee (most common)

The guarantor's liability is capped at a specific dollar amount — usually the difference between the buyer's deposit and 20% of the property value. This is the standard arrangement and the one most brokers recommend because it limits the guarantor's risk.

Security guarantee

The guarantor provides their property as additional security but is not liable for the borrower's repayments. Their risk is limited to the equity pledged, not the full loan amount.

Serviceability guarantee

The guarantor's income is included in the borrowing capacity assessment, allowing the borrower to qualify for a larger loan. This is less common and carries greater risk for the guarantor, as they may be liable for repayments if the borrower cannot meet them.