Family Guarantee Home Loan Guide
A family guarantee home loan lets you borrow up to 100% of a property purchase price without paying Lenders Mortgage Insurance, by using equity in a family member\'s home as additional security. It is one of the most consequential lending products available to first home buyers in Australia, and one of the most misunderstood. This guide walks through how the structure actually works, what the guarantor takes on, and when each party can step away cleanly.
- Family guarantee uses equity in a parent's property as additional security to avoid LMI.
- The "limited guarantee" structure caps the parent's exposure to roughly 20-25% of purchase price.
- Guarantor can be released once your LVR falls below 80%, typically 3-7 years.
- Independent legal advice for the guarantor is mandatory under most lender policies.
- Parents need at least about 20% of the purchase price as available equity in their own home.
How the structure works
In a family guarantee home loan, you (the borrower) take out a home loan to buy your property. The lender registers a mortgage over your property as primary security. Separately, the lender also registers a limited mortgage over your parent\'s property covering only the portion of your loan that exceeds 80% of your purchase price. This is called the "limited guarantee" amount.
For example: $700,000 purchase, 5% deposit ($35,000), $665,000 loan. Without a family guarantee, the loan is at 95% LVR and attracts substantial LMI. With a family guarantee, the lender splits the loan into two notional parts: $560,000 (80% of purchase) secured against your property only, and $105,000 (the gap) secured against both your property and the parent\'s. The parent\'s exposure is capped at $105,000, not the full $665,000.
What the parent puts at stake
The limited guarantee is registered as a mortgage on the parent\'s home for the limited amount. While the guarantee is in place:
- The parent\'s property carries a registered mortgage to your lender (in addition to any existing mortgage they may have).
- The parent\'s available equity for their own borrowing is reduced by the limited amount.
- If the parent has their own existing mortgage, the lender may need to consent to the new structure.
- If you default and the property sale does not cover the loan, the lender can pursue the limited-guarantee amount against the parent.
The savings: a worked example
Purchase: $700,000 in NSW with $35,000 deposit (5%)
Without family guarantee: 95% LVR, LMI approximately $24,000 (capitalised onto loan)
With family guarantee: no LMI, loan amount $665,000 plus government fees
Annual interest at 6.65% on $24,000 of saved LMI: $1,596 per year
Over a typical 5-year period before guarantor release, the family guarantee saves around $24,000 of LMI plus $5,000 to $8,000 of compound interest on it.
Releasing the guarantor
Releasing the guarantor is a formal process initiated when your loan-to-value ratio falls below 80%. The drivers:
- Regular principal-and-interest repayments steadily reduce the outstanding loan balance.
- Capital growth in your property increases the value, reducing LVR even without loan paydown.
- Extra repayments accelerate the timeline materially.
- Refinancing to a different lender at LVR below 80% releases the guarantor as part of the discharge.
The release requires a formal application to the lender, an updated valuation of your property, and lender approval. Most files clear within 4-6 weeks. The cost is usually a small valuation fee ($200-500) plus the discharge of the limited mortgage on the parent\'s property.
When a family guarantee makes sense
- First home buyer with stable income but small deposit: Saves substantial LMI without requiring a 20% deposit.
- Parent has substantial unencumbered equity and low debt: The marginal risk to the parent is modest if their own position is solid.
- Buyer expects to be able to release the guarantor within 5-7 years: Faster release reduces the parent\'s exposure window.
- Buyer not eligible for First Home Guarantee: Income or property-price caps exclude many buyers from FHG; family guarantee is the alternative path.
When a family guarantee does not make sense
- The parent\'s position is tight: If the parent has limited equity or significant existing debt, the guarantee can constrain their own financial flexibility.
- The borrower\'s servicing buffer is thin: If you cannot comfortably service the loan including a 0.50-1.00% rate buffer, the guarantee structure is masking a borrowing capacity issue rather than solving one.
- Family relationship is complicated: Guarantees create financial entanglement that can amplify family stress if circumstances change.
- First Home Guarantee is available: If you qualify, FHG achieves the same LMI-avoidance outcome without putting parental property at risk.
- The guarantor must obtain independent legal advice (lender mandatory)
- Confirm the guarantee is "limited" and the cap is acceptable to the parent
- Model the release timeline at conservative capital growth assumptions
- Discuss the worst case openly with the guarantor before signing
- Confirm what happens if the parent wants to sell their property mid-guarantee
WARNING: This comparison rate is true only for the example given and may not include all fees and charges. Different terms, fees, or other loan amounts might result in a different comparison rate. Comparison rates are based on a secured loan of $30,000 over 5 years for vehicle finance and $50,000 over 5 years for equipment finance, as required under the National Credit Code.