Guarantor Home Loans: How They Work and What Guarantors Risk
A guarantor home loan lets a family member — usually a parent — use the equity in their own property to help you buy sooner, often with no lenders mortgage insurance and sometimes with no cash deposit. Used well, it is one of the most effective tools available to first home buyers. But it puts a family member's property partly on the line, so both sides need to understand exactly how it works before anyone signs.
How a security guarantee actually works
Modern guarantor loans are security guarantees, not income guarantees. The guarantor does not hand over money and their income is not used to help you qualify — you still have to service the whole loan yourself. Instead, the guarantor offers the lender a mortgage over part of their own property as additional security.
The effect is on your loan-to-value ratio. Say you are borrowing close to the full purchase price: against your property alone, the LVR would be far above 80%, triggering LMI and tighter credit rules. Add a guarantee over a slice of the guarantor's equity and the lender's total security now comfortably covers the loan — the effective LVR drops to 80% or below, so LMI disappears.
Crucially, most lenders structure this as a limited guarantee: the guarantor is liable only for a defined amount — typically the slice needed to bring the effective LVR to 80% — not the whole loan. If a lender proposes an unlimited guarantee, treat that as a red flag and push back.
What the guarantor is really risking
The risk is real and it deserves plain language. If you default and the sale of your property does not cover the debt, the lender can call on the guarantee — meaning the guarantor must pay up to the guaranteed amount, refinance to raise it, or in the worst case have their property sold to recover it. Beyond that headline risk, guarantors should understand:
- Their property carries the lender's mortgage until release, which can complicate their own plans to sell, refinance or borrow
- Their future borrowing power is reduced, because lenders count contingent liabilities
- The arrangement can strain family relationships if the borrower struggles — money problems rarely stay private within families
- Guarantors nearing retirement face extra scrutiny, since their capacity to recover from a loss is lower
This is why lenders require — and courts expect — guarantors to receive independent legal advice, and often independent financial advice, before signing. Independent means their own adviser, not the borrower's. A guarantor should only ever guarantee an amount they could genuinely afford to lose without losing their home or retirement.
Who lenders accept as guarantors
Policies vary, but the common pattern: guarantors are usually parents (some lenders extend to siblings, grandparents or other close relatives), must own Australian property with sufficient equity, and must be able to demonstrate they could cover the guarantee if called on. Retired guarantors are accepted by some lenders and declined by others. The security offered is usually the guarantor's home or investment property, and some lenders accept a term deposit as security instead — which neatly caps the exposure. Because policy niches differ so much here, this is a genuinely broker-shaped problem: matching the family's situation to a lender that accepts it.
A 15-minute chat is usually enough to map your options — free, no obligation.
How and when the guarantee is released
A guarantee is not forever — and it should not be treated as forever. The standard release test is that your loan can stand on its own at 80% LVR or below against your property alone. You get there through some combination of paying the loan down and the property rising in value. The release process itself usually involves:
- Requesting the release from the lender (it rarely happens automatically — diarise it and ask)
- A current valuation of your property, usually at your cost
- The lender confirming your repayment history is clean and the numbers work
- Discharging the mortgage over the guarantor's property
Many families reach release within a few years. Making extra repayments early — or parking savings in an offset and then requesting a review — accelerates it. Track your position with our [LVR and LMI calculator](/calculators/lvr-lmi) so you know when you are close, and treat releasing the guarantor as a first-class goal of the loan, not an afterthought.
Protecting everyone involved
A few practices keep guarantor arrangements safe and families intact. Keep the guarantee limited and as small as the deal allows. Get the independent advice properly, not as a box-tick. Consider the borrower taking out income protection or life insurance so illness or job loss does not become the guarantor's problem. Agree in writing, within the family, what happens if things get tight — who says what to whom, and when. And borrow conservatively: a guarantee removes the LMI barrier, it does not make a bigger loan affordable. Test your own numbers with our [borrowing capacity calculator](/calculators/borrowing-capacity) rather than borrowing to the ceiling the guarantee unlocks.
Alternatives if a guarantee is not right
If the risk sits badly with anyone involved, there are other paths into the market. Paying [LMI](/articles/first-home-buyers/lmi-explained) keeps the purchase entirely on your own shoulders. The federal Home Guarantee Scheme can eliminate LMI for eligible buyers with a 5% deposit — as at July 2026, check current criteria with [Housing Australia](https://www.housingaustralia.gov.au). A cash gift toward your deposit involves no ongoing liability for your parents, though genuine savings rules may apply. And some families simply choose a cheaper property or a longer saving runway. Our [low deposit home loans guide](/articles/first-home-buyers/low-deposit-home-loans) compares these options side by side.
Talk it through with a broker
Guarantor lending is where lender policy differences matter most — who can guarantee, how much, and how release works all vary. If your family is weighing it up, [get in touch](/contact) and we will walk both generations through the structure, the risks and the exit plan before anyone commits.
Frequently asked questions
Does a guarantor have to give money or make my repayments?
No. A security guarantor offers equity in their property as additional security — no cash changes hands and they make no repayments. Their liability only crystallises if you default and your property's sale does not cover the guaranteed amount. You must still qualify to service the entire loan from your own income.
Can a guarantor lose their house?
In a worst-case scenario, yes — if the borrower defaults, the shortfall reaches the guaranteed amount, and the guarantor cannot pay it or refinance to raise it, the lender can enforce its mortgage over the guarantor's property. Limited guarantees cap this exposure at a defined amount, which is why they matter and why independent legal advice is required.
How much deposit do I need with a guarantor?
Potentially none, because the guarantor's equity substitutes for the deposit — though you generally still need funds for purchase costs like transfer duty and legal fees, and some lenders still want to see savings history. Borrowing more than the property's value is possible with some lenders when costs are included, but it means starting with negative equity in your own property.
When can a guarantor be released from the loan?
Usually once your loan is at or below 80% of your property's value on its own — through repayments, value growth or both. The release rarely happens automatically: you request it, pay for a valuation, and the lender checks your repayment history before discharging the mortgage over the guarantor's property. Many families get there within a few years.
Does being a guarantor affect the guarantor's own borrowing power?
Yes. Lenders treat the guarantee as a contingent liability, which reduces what the guarantor can borrow themselves, and the mortgage over their property can complicate selling or refinancing until release. Guarantors with plans of their own — downsizing, renovating, retiring — should factor the guarantee's likely duration into those plans.