A guarantor home loan lets a family member — almost always a parent — offer equity in their own property as additional security for your loan. Because the combined security takes your effective loan-to-value ratio below 80%, you can typically borrow up to 100% of the purchase price with no deposit and no Lenders Mortgage Insurance. The guarantor does not give you money, but they are legally liable for the guaranteed portion if you default.
The guarantor pledges a portion of their property equity as additional security. The lender adds that to your property as combined security, which brings the effective LVR below the 80% threshold where LMI applies.
Worked example on a $700,000 purchase with no cash deposit. The guarantee amount is the smallest slice needed to reach an 80% combined LVR, plus a buffer for costs.
| Item | Amount | Note |
|---|---|---|
| Purchase price | $700,000 | Your property |
| Loan required | $700,000 | No cash deposit contributed |
| LVR on your property alone | 100% | Would normally be declined, or attract maximum LMI |
| Guarantee taken over parent’s property | $175,000 | Limited guarantee — not the full loan |
| Combined security value | $875,000 | Your $700,000 plus $175,000 pledged |
| Effective LVR | 80% | At or below the LMI threshold |
| LMI payable | Nil | The reason the structure exists |
Insist on a limited guarantee. An unlimited guarantee exposes the guarantor to the entire loan balance rather than the slice needed to reach 80%. Every lender on our modelled panel supports limited guarantees, and there is rarely a reason to accept anything else.
This is the part that deserves plain language, because a guarantee is a genuine legal liability and not a formality.
Lenders require guarantors to obtain independent legal advice before signing, and in most cases independent financial advice as well. This is a consumer protection, not a formality — the certificate is what makes the guarantee enforceable.
A guarantee is intended to be temporary. Release happens once your own property has enough equity that the combined security is no longer needed, which usually takes three to five years through a mix of repayments and capital growth.
Through principal repayments, extra repayments, or property value growth. Reaching 80% LVR on your property alone is the trigger.
The lender revalues your property to confirm the current LVR. You usually pay for this, at roughly $300 to $600.
A formal request to the lender. It reassesses your serviceability on the standalone loan before agreeing.
The guarantee is removed from the guarantor’s title and their equity is freed. No LMI becomes payable at this point.
Making extra repayments early materially shortens the guarantee period. Every dollar of principal paid ahead of schedule brings the release date forward, which is the single most useful thing you can do for the person who backed you.
A family member pledges equity in their property as additional security for your loan. The combined security brings your effective loan-to-value ratio to 80% or below, which removes the need for Lenders Mortgage Insurance and can allow you to borrow up to 100% of the purchase price with no cash deposit.
The lender can pursue the guarantor for the guaranteed amount, and in the worst case their property can be sold to satisfy it. With a limited guarantee the exposure is capped at the pledged amount rather than the whole loan, which is why limited guarantees should always be preferred.
Typically 3 to 5 years. The guarantee can be released once your own property reaches roughly 80% LVR through repayments and capital growth. Release requires a valuation and a serviceability reassessment, and you need to apply for it — it does not happen automatically.
Yes. What matters is usable equity, not whether the property is unencumbered. A parent with a $900,000 property and a $300,000 mortgage has substantial equity available to support a limited guarantee.
No, not while the loan is performing. The guarantor pledges security rather than servicing the loan. They only become liable if you default and the lender calls on the guarantee. Some lenders will still check the guarantor could service the guaranteed portion.
Sometimes, but it narrows your lender choice considerably. Lenders apply extra scrutiny where a guarantor is retired or near retirement, because they must consider whether calling on the guarantee would cause hardship. Some decline retired guarantors outright.
We can show you the exact guarantee amount required, which lenders accept your guarantor's circumstances, and the realistic release timeline — before you have a difficult conversation with your parents.
NIK Finance Pty Ltd (ACN 685 393 917) is a Credit Representative (567387) of Finsure Finance & Insurance Pty Ltd (Australian Credit Licence 384704). This page is general information only and does not constitute financial advice. Consider your personal circumstances and speak with a licensed broker before applying for credit.