A family guarantee bridges the deposit gap. It also puts the guarantor's home on the line.
With a family guarantee, a parent doesn't hand over cash — they pledge some of the equity in their own property as extra security, so a buyer with a small deposit can reach the 80% mark and avoid lenders mortgage insurance. It can bring a purchase forward by years. But it is a serious commitment: if the loan defaults, the guarantor's property can be sold to cover it. We think the honest version — how it works and what's genuinely at stake — is the only version worth reading.
How the guarantee bridges the deposit gap.
On the combined capital-cities median dwelling value of about $1.03 million, a 20% deposit is roughly $206,000 — years of saving. A guarantee lets a buyer cover part of it themselves and have a guarantor's equity secure the rest, so the loan is measured against a larger pool of security and the effective LVR drops to 80%. No cash changes hands: the guarantor pledges equity, not money.
Before the benefits, read this. The guarantor's home is real security.
A guarantee is a legal commitment, not a favour that can be quietly undone. ASIC's MoneySmart advice is blunt: treat going guarantor as if you were taking out the loan yourself. Here is what a guarantor is actually accepting — we give it more space than the savings on purpose.
▲ Your home can be sold on default
If the borrower can't make repayments, the guarantor is legally responsible for the guaranteed portion plus interest. If the guarantor can't pay either, the lender can repossess and sell the asset used as security — including the guarantor's own home. The property is genuinely on the line.
▲ It reduces your own borrowing power
When a guarantor later applies for their own credit, they must disclose the loan they guarantee — and a lender may decline them even if the borrower is up to date. If either party misses payments, a default can be recorded on the guarantor's credit file, making future borrowing harder.
▲ Get your own legal advice first
Lenders require — and MoneySmart urges — a prospective guarantor to obtain independent legal advice, and often independent financial advice, before the guarantee is signed. That's so the guarantor understands their obligations separately from the borrower, with the loan contract in hand and questions answered. Never sign without it.
▲ Cap it, don't guarantee the whole loan
A guarantee can usually be limited to a set amount — commonly just the gap between the buyer's deposit and 20% — rather than the entire debt. Agreeing a capped, limited guarantee bounds the exposure. Rate rises also matter: they lift repayments, can delay release, and raise the amount a guarantor stands behind.
Source: ASIC MoneySmart, "Going guarantor on a loan"; NAB and Canstar guarantor guidance; APRA serviceability-buffer guidance (a 3.0 percentage-point buffer over the loan rate applied by lenders, current setting). Going guarantor can also strain family relationships and be hard to exit once given. This is general information, not personal credit, legal or financial advice — obtain your own advice before acting.
The guarantee is temporary — here's the exit path.
A family guarantee is a bridge, not a permanent arrangement. As the borrower repays the loan and the property value grows, their own equity builds and their LVR falls. Once it reaches about 80% (roughly 20% equity) and the borrower can service the loan on their own income, both parties can apply to release the guarantee — usually via a review or refinance with a fresh valuation. Release isn't automatic; it needs a lender application and reassessment.
Illustrative only — the path depends on repayments, extra repayments and property-value movement, and the release threshold, whether a refinance or review is required, and valuation rules vary by lender. A rate rise flattens the curve: higher repayments tighten serviceability and can push the release date out, while also raising the amount the guarantor is backing in the meantime. Not an offer of credit or a guarantee of release.
What's gained, set against what's risked.
A guarantee can bring a purchase forward by years — but only the family can decide if the trade is worth it. Both sides, side by side.
What the buyer gains
- Enters the market without waiting to save a full 20% deposit — which now takes about 11.2 years, up from 9.0 in 2015.
- Can avoid or reduce LMI — an indicative ~$9,700 to ~$26,000+ premium that would otherwise buy the buyer no cover, since LMI protects the lender.
- Starts building their own equity from day one, moving toward the point where the guarantee is released.
- Keeps more of their own savings rather than sinking every dollar into the deposit.
▲ What the guarantor risks
- Their own home is used as security and can be sold if the loan defaults and they can't cover the guaranteed portion.
- Their borrowing power drops and their credit file can be marked if repayments are missed.
- They must obtain their own independent legal (and often financial) advice before signing — a required step, not a formality.
- Exiting a guarantee is hard once given, and it can strain family relationships. Capping the guarantee to the gap limits, but doesn't remove, the exposure.
Three things that make a family guarantee different.
Equity, not cash
The guarantor doesn't give the borrower money. They offer a portion of the equity in their own property as additional security — so the borrower's loan is measured against a larger security pool.
It lifts total security, cutting LVR
Adding the guarantor's property brings the effective LVR to 80% or below — the threshold where LMI normally stops applying — even where the buyer has only a 5–10% deposit.
Security guarantee, capped
Most family guarantees are security guarantees limited to the gap — the borrower still makes all repayments. A capped, limited guarantee is safer than backing the whole loan; a broader "servicing" guarantee is best avoided.
The deposit — not the repayments — is the wall.
Prices and the time to save have pushed low-deposit buying into the mainstream. That's the gap a guarantee is designed to bridge.
Sources: Cotality (formerly CoreLogic) Home Value Index, houses and units combined, as at 31 May 2026; National Housing Supply and Affordability Council, State of the Housing System 2026 (deposit-saving time, 2025); APRA Quarterly ADI Property Exposure statistics, quarter ending 30 September 2025 (6.1% of new lending was at a debt-to-income ratio of 6 or more). Figures describe the market, not your circumstances.
How we help — and where we stop
A family guarantee is a strategy we help arrange, matched across our panel of 50 lenders — whose guarantee policies differ on the cap allowed, guarantor age limits, genuine-savings rules and release conditions. We map how the gap is bridged, what LMI it could avoid, and a realistic path to releasing the guarantee, then set it up so the protections work in your favour.
What we don't do is talk anyone into it. A guarantee turns on a lender's assessment of both parties, and the guarantor's own legal and financial advice sits outside our role by design. We'll make sure both sides go in with eyes open.
We compare products from our panel of 50 lenders but not every product or lender in the market. Guarantor lending is subject to lender assessment of both the borrower and the guarantor; approval, the cap available and release terms are confirmed in writing by the lender and are not guaranteed here.
Family guarantees, answered straight.
How does a family guarantee home loan work?
A family member — usually a parent — pledges some of the equity in their own property as additional security for the borrower's loan. No cash changes hands. Because the loan is measured against a larger pool of security, the effective LVR falls to 80% or below, so the borrower can buy with a small deposit and avoid or reduce lenders mortgage insurance. The borrower still makes all the repayments.
What's at risk for the guarantor?
A lot. The guarantor's own property is security. If the borrower can't repay and the guarantor can't cover the guaranteed portion, the lender can repossess and sell the guarantor's home. Guaranteeing a loan also reduces the guarantor's own borrowing power, and a missed payment by either party can be recorded on the guarantor's credit file. It's a legal commitment that's hard to exit once given, so treat it as if you were taking out the loan yourself.
When can the guarantee be released?
It's temporary. Once the borrower's loan reaches about 80% of the property value (roughly 20% equity) and they can service the loan on their own income, both parties can apply to release the guarantee — typically through a review or a refinance with a fresh valuation. Release isn't automatic and needs a lender reassessment. A rate rise can slow serviceability and push the release date out.
Does the guarantor have to give the buyer money?
No. In a security guarantee the guarantor pledges equity in their property, not cash. That equity secures the shortfall between the buyer's deposit and the 20% mark. It's the guarantor's property standing behind part of the loan — not a deposit gift — which is exactly why the risk is real.
Does the guarantor need their own legal advice?
Yes. Lenders require, and ASIC's MoneySmart urges, a prospective guarantor to obtain independent legal advice — and often independent financial advice — before signing, so they understand their obligations separately from the borrower. Get the loan contract early and keep asking questions until it's clear. Never sign a guarantee you don't fully understand.
Can the guarantee be limited to a set amount?
Usually, yes. A guarantee can often be capped to a specified portion of the loan — commonly just the gap between the buyer's deposit and 20% — rather than the whole debt. A limited, capped guarantee bounds the guarantor's exposure. We'll help structure it that way and confirm what each lender allows.
Thinking about a family guarantee? Let's do it properly.
We'll map the deposit gap, show the LMI it could avoid and a realistic path to releasing the guarantee — and make sure the guarantor understands exactly what they're backing before anyone signs. No credit check to start.
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