Going guarantor for your child's home loan: what you're actually agreeing to

What a guarantee actually is — legally

When you "go guarantor" for your child's home loan, what you're actually doing is offering the bank a contractual promise: if my child doesn't pay this loan, I will. The promise is enforceable against you as if you were the borrower yourself. The bank can sue you for the debt, take you to court, get a judgment, and enforce that judgment against your assets — including, in most cases, your home.

That's the worst-case version. The everyday version, in 99% of guarantor loans, is that nothing goes wrong: your child pays the mortgage like any other borrower, refinances out of the guarantee in a few years once they have enough equity, and you never hear from the bank again. But the legal commitment you're making is to the worst-case version. It pays to understand it before you sign.

Australian courts have repeatedly enforced parental guarantees, even in heartbreaking circumstances. The "I didn't really understand what I was signing" defence rarely works — which is exactly why the bank insists on independent legal advice in the first place. The ILA solicitor's job is to make sure you genuinely do understand, before you sign.

Limited vs unlimited guarantees — the single most important distinction

If you take only one thing from this article, take this: guarantee for a specific dollar amount, not "all amounts owing".

An unlimited guarantee (sometimes called an "all monies" guarantee) makes you liable for whatever the borrower happens to owe the bank, now or in the future. If your child takes a top-up loan, a personal loan, a car loan, or a business overdraft with the same bank, your guarantee may cover those too — without you ever being notified or asked.

A limited guarantee caps your exposure at a specific number. Most commonly, the limit is set to the amount of the deposit shortfall — the gap between what your child has saved and the 20% deposit the bank wants. For a $700,000 purchase where your child has saved $70,000, the limited guarantee might cap your exposure at around $70,000–$80,000, not the entire $560,000 loan.

Major Australian lenders all offer limited guarantees, but you usually have to ask for one specifically. The default loan documents are sometimes drafted as unlimited. The ILA appointment is the moment to confirm exactly what you've been asked to sign, and to push back if the wording doesn't match what was agreed.

What the bank can do if your child defaults

Default doesn't happen overnight, and it doesn't happen quietly. The typical sequence:

1. Your child misses a mortgage repayment.
2. After roughly 30 days, the bank issues a default notice — formally giving the borrower a period (usually 30–60 days) to catch up.
3. If the arrears aren't cleared, the bank can accelerate the loan (demand the whole balance), commence enforcement against the security property, and pursue any guarantors for any shortfall.
4. The bank will usually sell the security property first. If that sale clears the debt, the guarantee is never called on.
5. If there's a shortfall — the sale doesn't recover the full debt — the bank can pursue the guarantor for the difference, capped at the guarantee limit if it's a limited guarantee.

"Pursuing the guarantor" usually means demand letters first, then legal proceedings if the demand isn't met. In the worst case, the bank can obtain a judgment, register it against your assets, and force the sale of your home to satisfy the debt. This is rare — most guarantor situations resolve through negotiation or the borrower catching up — but it is what you are legally exposed to.

How to protect your home

There are several layers of protection available. Most of them have to be put in place before you sign:

• Use a limited guarantee, capped at the smallest possible amount. If the bank quotes a $200,000 cap and you can structure the deal with a $100,000 cap, take the smaller number.
• Avoid pledging your home as security if possible. Some guarantee structures use only your savings or an investment property; others register a mortgage over your primary residence. Pushing for the former materially reduces what's at risk.
• Agree a "release event" with your child in writing. Most banks will discharge the guarantee once the child's loan-to-value ratio drops below 80% (through repayments or property appreciation). Have a written family agreement about when you'll request the release, and what happens if your child doesn't co-operate.
• Make sure you can afford it if called on. Treat the guaranteed amount as if it were money you owed yourself. If you couldn't comfortably absorb that loss, the structure is too aggressive.
• Insist on insurance. Your child should have income protection, total and permanent disability cover, and ideally life insurance, especially while you're on the guarantee. If they're hit by a bus, you don't want to be the one absorbing the mortgage.

Questions to ask before you sign

Bring this list to your ILA appointment. The solicitor's job is to answer all of them clearly:

1. Is this a limited or unlimited guarantee? In dollar terms, what's the most I can lose?
2. What security is being taken? Just my savings? My investment property? My family home?
3. What event would trigger the bank coming after me?
4. What does "default" mean under this loan — what behaviour by the borrower would put me on the hook?
5. How and when can the guarantee be released? What does my child need to do?
6. If my child wants to take a top-up loan in three years, am I automatically guaranteeing that too?
7. Can I revoke the guarantee at any point if my circumstances change?
8. What happens if I die before the guarantee is released?
9. What does the bank's hardship process look like if my child gets into trouble?
10. What's the worst plausible scenario you've seen for a guarantor in this position?

A good ILA solicitor will go through all of this without you needing to ask. If your appointment doesn't touch on these points, you didn't get a complete advice session.

Alternatives to going guarantor

Before you sign, it's worth thinking about whether a guarantee is actually the right tool. Some alternatives that achieve the same outcome with less personal risk:

• Gift the deposit instead. If you can afford it, transferring the deposit money directly removes the need for a guarantee entirely. The child takes a normal loan with a 20% deposit. You lose the money for good (rather than guaranteeing it temporarily), but you have no ongoing legal exposure.
• Loan, not gift. Lend your child the deposit on terms documented properly (a family loan agreement, with interest and a repayment schedule). The bank will need to know about the loan, and it may affect your child's borrowing capacity, but it keeps the bank out of your asset list.
• Joint purchase. Buy the property together as co-owners, with a clear written agreement about who pays what and how exits work. More complex, but sometimes cleaner than a guarantee.
• Wait. If your child is 12 months away from having a 20% deposit on their own, the simplest answer might be patience.

None of these are universally better than a guarantee — every family's situation is different. The point is to make the choice with eyes open, not to default to "of course we'll go guarantor" because the broker suggested it.

The ILA step itself

When you go guarantor for a child's home loan in Australia, the bank will require ILA before they release the funds. The appointment is your chance to ask every question on the list above to an independent solicitor — one with no commercial interest in whether you sign.

It is genuinely a moment to slow down. If anything you hear in the meeting doesn't sit right, don't sign. The bank can wait. So can the property settlement, with a short extension. The one thing that can't be undone is a guarantee you've already signed.

For more on how the appointment runs, see what to bring to your ILA appointment. For a deeper dive on guarantor structures specifically for first home buyers, see guarantor loans for first home buyers.