Guarantor Home Loans: A Plain-English Guide for Buyers and Parents

By Andrew Paterson

A guarantor home loan can get you into your own place years sooner. It lets a family member use the equity in their home to back part of your loan.

Related: the real numbers behind a limited guarantee

No cash changes hands. No one goes on your title. Done right, it can wipe out lenders mortgage insurance and save you tens of thousands.

But it is a serious commitment for the person helping you. So let me walk you through exactly how it works, who can help, the risks, and the plan to get them off the loan.

What is a guarantor home loan?

A guarantor home loan is where a family member, usually a parent, pledges the equity in their property as extra security for your loan. This is often referred to as the Bank of Mum and Dad arrangement, and it works best when everyone puts the terms in writing from day one.

The lender uses that security to bring your effective loan-to-value ratio (LVR) down to 80% or below. That is the magic number where lenders mortgage insurance (LMI) disappears.

Here is the key point most articles gloss over: it is almost always a limited guarantee.

Your parents do not guarantee the whole loan. They guarantee only the gap between your deposit and the 80% mark, plus costs. That cap is written into the documents.

How does a guarantor home loan work?

The mechanics are simpler than people expect.

• You find a property and pull together whatever deposit you have, even if it is small.
• Your guarantor offers a slice of equity in their home as additional security.
• The lender combines your property and that pledged portion, dropping your LVR under 80%.
• No LMI applies, and you often get sharper interest rates reserved for low-LVR borrowers.
• Your guarantor makes no repayments and stays off your title. Their exposure is capped at the guaranteed amount.

The guarantee sits as a limited mortgage over their property. Once your equity grows enough, you apply to have it released. More on that later, because the exit plan matters.

Why bother? The LMI problem

If you borrow more than 80% of a property’s value, most lenders charge LMI. That premium protects the lender, not you, and it can be brutal. If you want the full picture, our guide on how lenders mortgage insurance actually works breaks down exactly why it exists and who benefits.

Rough guide: LMI runs from around 0.5% of the loan at 81% LVR up to about 3.5% at 95% LVR, plus stamp duty on the premium.

In dollar terms:

• A $600,000 property with a 10% deposit (90% LVR) might cost roughly $8,000 to $12,000 in LMI.
• At 95% LVR (5% deposit) that can climb past $15,000 to $20,000, and on larger loans much higher again.

A guarantor structure can remove that cost entirely. That is the whole appeal. It is also worth understanding what LMI actually covers, because it is not protection for you as the borrower.

A Geelong worked example

Let me put real numbers on it. Greater Geelong’s median house value sat around $793,000 in early 2026, up 3.2% year on year per PropTrack.

Say you are buying at that median with a 5% deposit of about $39,650.

• Your loan would be roughly $753,350. That is about 95% LVR.
• Without help, that attracts serious LMI.

Now bring in a limited family guarantee. Eighty per cent of $793,000 is about $634,400.

• The guarantee needs to cover the gap of roughly $118,950, plus buying costs.
• The lender now treats you as a sub-80% borrower. No LMI.
• Your parents’ exposure is capped near that $118,950 figure, not the full $753,350 loan.

Compare that to saving a full 20% deposit of about $158,600. For most people that is years of saving while rents keep climbing, which is exactly why our piece on saving a house deposit faster in Geelong is worth a read alongside this one.

Geelong is now the second most popular regional destination in Australia, taking 6.6% of all capital-city leavers in 2025. Competition for entry-level stock is real, so timing counts.

Stacking the benefits in Victoria

A guarantor loan can combine with first home buyer concessions. That is where the savings really add up.

For eligible Victorian first home buyers:

• A property with a dutiable value of $600,000 or less pays $0 stamp duty.
• Between $600,001 and $750,000 you get a sliding concession that tapers to nil at $750,000.
• The First Home Owner Grant pays $10,000, but only on new homes valued up to $750,000.

So if you buy in a Geelong entry suburb under $600,000, you could pair a guarantor loan with a full stamp duty exemption. Two big costs handled at once.

Who can be a guarantor?

Lenders keep this tight. Parents are the standard, but the door is wider than many think.

Depending on the lender, a guarantor can be a:

• Parent or legal guardian
• Sibling
• Adult child
• Grandparent
• Spouse or de facto partner

Some lenders are stricter than others, so this is where a broker earns their keep. We match your situation to a lender whose policy fits.

A guarantor generally needs to:

• Own Australian property with enough usable equity, commonly $100,000 to $150,000 or more.
• Keep their own LVR under 80% after the guarantee is applied.
• Have good credit and stable income.
• Fall within the lender’s age range, often assessed against the loan term, not just today’s age.

That last point trips people up. A guarantor in their late 50s or 60s taking on a 30-year term may fail some lenders on age at maturity. Others will still consider it. It comes down to lender selection.

The risks of being a guarantor

Let me be straight with any parents reading this. This is a real liability, and you deserve the honest version.

Here is what actually happens:

1. You make no repayments. That stays with the borrower.
2. You are not on the title and do not own part of the home.
3. Your exposure is capped at the limited guarantee amount, written into the documents.
4. The guarantee is only ever called on if the borrower defaults and selling the property does not clear the debt.

There is one more consideration worth flagging. The guarantee counts as a contingent liability.

That can reduce your own borrowing capacity for a year or two. If you want to understand how that assessment actually plays out, see our guide on how lenders calculate how much you can borrow. So if you are planning to downsize or refinance soon, we need to factor that in before you sign anything.

In 2026, independent legal advice for the guarantor is effectively mandatory under most lender policies. Some also require independent financial advice. This exists to protect you, and I always encourage it regardless of whether the lender demands it.

How to ask your parents

Awkward conversation, I know. Making it concrete helps.

• Show them the limited guarantee figure, not a scary whole-loan number.
• Explain they make no repayments and own no part of your home.
• Walk them through the exit plan so they can see an end date.
• Offer to have them sit in on a chat with a broker and their own solicitor.

The clearer the numbers, the calmer the conversation.

Getting your guarantor off the loan

This is the section most guides skip, and it is the one that keeps parents up at night.

The guarantee does not end automatically when you hit 80% LVR. You have to formally apply to release it, or refinance.

Release usually becomes possible once your LVR falls below 80%. That typically happens within three to seven years through:

• Regular principal and interest repayments chipping away at the balance
• Capital growth lifting your property’s value
• Extra repayments, lump sums or using an offset to reduce what you owe

When you are ready, the process runs like this:

1. You request a guarantee release from the lender.
2. The lender orders an updated valuation.
3. If your LVR is under 80%, they approve and discharge the limited mortgage.

It usually clears in about four to six weeks. The cost is modest, often a valuation fee of around $200 to $500 plus the discharge.

Set a target milestone up front. Pick an equity figure or rough date and work towards it. If your parents need to sell or refinance before then, there are options like substituting security, so talk to us early rather than late.

Guarantor loan vs the 5% Deposit Scheme

Here is a live change worth knowing about. Since 1 October 2025, the federal First Home Guarantee, now branded the Australian Government 5% Deposit Scheme, was expanded significantly.

• Income caps removed
• Annual place caps abolished, where there used to be a 35,000-a-year limit
• Property price caps raised

Under the scheme you buy with a 5% deposit and pay no LMI, with the government guaranteeing up to 15% of the value. More than 300,000 Australians have used the 5% Deposit Scheme since 2020 per Housing Australia.

So for many first home buyers, you may not need a guarantor at all.

When does a guarantor loan still make more sense? Consider it when:

Situation	Better fit
Property above the scheme price cap	Guarantor loan
Not a first home buyer	Guarantor loan
First home buyer under the cap	5% Deposit Scheme worth weighing
Want the sharpest low-LVR pricing	Compare both closely

The scheme’s price cap for Geelong sits around $950,000 by several broker sources, though exact caps are location-specific and updated periodically. Not every lender participates either, which is covered in our rundown of which lenders offer the First Home Guarantee. We confirm the current figure for your address before you rely on it.

Is a guarantor home loan right for you?

There is no blanket answer, and I would not give you one. The right structure depends on your deposit, your goals, your guarantor’s situation and how things may change.

What I can do is model both a guarantor loan and the deposit scheme with your real numbers, then show you the full cost and the exit plan side by side.

That is the conversation worth having.

This article is general information only and does not take your personal circumstances into account. It is not financial, legal or tax advice. Lending criteria, government schemes, stamp duty rules and property values change and vary by lender and location. Figures quoted are indicative and current at the time of writing. Please seek personal advice and confirm eligibility before acting. Guarantors should obtain independent legal and financial advice.

Frequently asked questions

Does a guarantor cover my whole home loan?

Usually no. Most guarantor loans use a limited guarantee that covers only the gap between your deposit and 80% of the property value, plus costs. That cap is written into the loan documents, so your guarantor’s exposure is capped, not open-ended across the whole loan.

Can my guarantor be removed later?

Yes, but it is not automatic. Once your LVR drops below 80%, through repayments and capital growth, you apply for a guarantee release or refinance. The lender orders a fresh valuation and, if you qualify, discharges the limited mortgage. This commonly happens within three to seven years and the formal process usually clears in about four to six weeks.

What happens to my parents if I can’t pay?

The guarantee is only called on if you default and selling the property does not clear the debt. Even then, your parents’ liability is limited to the guaranteed portion, not the full loan. They make no repayments while things are on track and are not on your title.

Do I still need a deposit with a guarantor loan?

You often need a smaller deposit, and sometimes very little of your own cash, because the guarantee covers the gap to 80%. You will still need funds for stamp duty and buying costs unless those are otherwise covered, so we work through the full amount you need before you make an offer.

Is a guarantor loan better than the 5% Deposit Scheme?

It depends. Since October 2025 the federal scheme dropped income and place caps, so many first home buyers under the price cap no longer need a guarantor. A guarantor loan still suits buyers above the cap, non-first-home buyers, or those wanting sharper low-LVR pricing. We compare both with your numbers.

Will being a guarantor affect my parents’ borrowing power?

It can. The guarantee counts as a contingent liability and may reduce their borrowing capacity for a year or two. If they plan to downsize or refinance soon, that needs factoring in before they commit, which is exactly the kind of thing we map out early.