Guarantor loans explained: what your parents are actually signing

Published 12 June 2026 · Updated 12 June 2026 · 7 min read · By Shane Heness, mortgage broker

Guarantor loans get explained to the buyer. They rarely get explained properly to the people taking the risk. This article is written for the parents.

What the guarantee actually is

A family guarantee is a second mortgage over a limited portion of the guarantor's property. It is security, not cash. No money moves from the parents' account, and the parents do not become liable for the buyer's repayments. What they do is give the lender a fallback if things go badly.

The lender is solving a specific problem with it. A buyer with a 5% deposit is a higher risk than one with 20%, so the lender charges lender's mortgage insurance to cover that gap. If a parent's equity fills the gap instead, the insurance is not needed. That is the whole mechanism.

A worked example

Illustrative figures only. LMI premiums vary by lender, loan size and deposit. Your own numbers will differ.

The saving is real. The risk is also real, and the two need to be weighed by the people carrying each one.

What the parents are putting at risk

The guaranteed amount, and only the guaranteed amount, if the guarantee is limited. That is the single most important thing to check before signing. A limited guarantee caps the parents' exposure at a stated dollar figure. An unlimited guarantee does not, and puts the whole of the parents' property behind the whole of the buyer's loan.

Some lenders still offer unlimited guarantees. There is almost never a good reason to accept one. If a lender will not limit the guarantee, that is a reason to use a different lender, not a reason to sign.

The order of recovery

If the buyer stops paying, the lender does not go straight to the parents. The sequence is:

1. The lender works with the borrower on hardship arrangements.
2. If that fails, the lender takes possession of and sells the buyer's property.
3. The sale proceeds pay down the loan.
4. If a shortfall remains, the lender calls on the guarantee, up to the guaranteed limit.
5. If the parents cannot pay that shortfall in cash, the lender can recover it against their property.

That last step is the one families do not picture. It is unlikely, but it is the thing being agreed to, and it deserves to be said out loud rather than buried in a document.

The second cost nobody mentions

A guarantee reduces the parents' own borrowing capacity while it is in place. Lenders treat the guaranteed sum as a contingent liability. If the parents are thinking about a renovation, an investment purchase, a car loan or a downsize in the next few years, the guarantee will make each of those harder.

We ask this question early, and it changes the answer more often than people expect. A couple planning to downsize in two years is usually better served by a smaller gifted deposit, or by the buyer waiting six months and paying the LMI, than by a guarantee that ties up their equity right when they need it.

Getting the guarantee released

The guarantee is not permanent. Once the loan balance drops below 80% of the buyer's property value, the guarantee can be released. Two things move that number: the buyer paying the loan down, and the property growing in value.

Three to six years is the usual span. The important part is that release does not happen by itself. Someone has to apply, the lender orders a valuation, and if the numbers work the second mortgage is discharged. We diarise this for clients and check it each year at the loan anniversary, because a guarantee left in place years longer than necessary is a cost the parents are paying for nothing.

Questions parents should ask before signing

• Is the guarantee limited, and to exactly what dollar figure? Get the number in writing.
• What is the release trigger, and who applies for it? Confirm the LVR threshold and the process.
• How much does this reduce our own borrowing capacity? Ask for the figure before, not after.
• What happens if we want to sell our house while the guarantee is in place? It is possible, but the guarantee has to be dealt with first.
• What happens if one of us dies or the relationship ends? Guarantees survive both, and estates get complicated.
• Has everyone had independent legal advice? Most lenders require it for guarantors. Take it seriously rather than treating it as a formality.

When a guarantee is the right call, and when it is not

It works well where the buyer has stable income and a genuine capacity to repay, but simply has not had time to save 20% in a market that moved faster than their savings. That is the classic case, and the guarantee solves a timing problem rather than an affordability problem.

It works badly where the buyer's income is marginal, where the purchase is at the absolute limit of what they can service, or where the parents are close to retirement and will need their equity. In those cases the guarantee does not remove the risk, it moves it onto the household least able to carry it.

Alternatives worth comparing before you use a guarantee

A guarantee is one way to solve a deposit shortfall. It is not the only one, and it is the only one that puts a second household's property at risk. Before signing, price the alternatives honestly.

Illustrative only. LMI premiums, scheme caps and eligibility change. Figures current at September 2026.

The comparison that surprises people most often is the third row against the first. Where parents have cash rather than equity, a gift is usually cleaner than a guarantee: the money is gone either way in the worst case, but a gift ends the moment it is made, while a guarantee sits on their file for years and quietly reduces what they can do.

The comparison that surprises people second most is the second row. LMI has a bad name, but it is a defined, one-off, capitalised cost, and it buys the parents complete freedom from the transaction. For a household earning well and buying at a sensible price, paying the premium and keeping the family financially independent is often the better trade. It is worth putting both numbers on paper before anyone signs anything.

The honest version of this conversation involves both generations in the same room. We are happy to run it that way, and it usually takes about an hour. If you want to talk it through, our guarantor loans page sets out the structures in more detail, or you can book a free call.

Frequently asked questions

Written by Shane Heness

Owner and mortgage broker at LoanBuddy, Parramatta NSW. Eight years as a mortgage broker and a property investor since 2015. Credit Representative #528658 under Australian Credit Licence #389328.