With high property prices across Australia, it is increasingly common for parents to help their children buy a home. For many, a contribution towards a house deposit feels like a natural step to help the next generation get ahead. However, what often begins as a well-meaning cash transfer can quickly turn into a financial and legal headache if it is not documented properly.

A handshake agreement or an undocumented transfer is risky. Without a formal structure, you may leave your own retirement savings exposed to unforeseen events, such as your child’s relationship breaking down or unexpected financial difficulties.

To protect both your wealth and your family’s future, it is worth treating this financial assistance as a properly documented loan rather than a simple cash gift, if a loan is what you intend.

The Problem with Undocumented Gifts

When you hand over money for a house deposit without clear written terms, the court is likely to treat it as a gift.

While you might trust your child completely, an undocumented gift offers little protection if circumstances change. If your child later separates or divorces, the money you contributed may be treated as part of the couple’s joint asset pool. This means your child’s former partner could receive a share of funds you intended to keep within your family.

As noted by Fox and Thomas Lawyers, the Federal Circuit and Family Court of Australia looks at factors such as whether there was a written agreement, whether repayment was demanded, whether repayments were actually made, whether interest is payable and whether the loan is secured. Without that evidence, parents may face considerable legal fees trying to recover their money.

Why a Formal Loan Agreement Is Better

A written loan agreement removes the ambiguity of a cash gift. If the court accepts the money as a genuine loan, it is treated as a debt of the relationship and repaid from the asset pool before the remaining assets are divided between your child and their former partner.

The word “genuine” matters. Courts look at what the parties actually did, not just what the paperwork says. Fox and Thomas stress that the agreement should be signed before the money is lent, and that its terms should be followed, including regular repayments and interest if these are agreed. Payments need to start well before any separation, because late payments can look like an attempt to turn a gift into a loan for the purposes of a property settlement.

You can still tailor the loan to your family’s circumstances, such as a modest repayment amount or a lower interest rate. The more a loan looks like a real debt, with a repayment schedule, evidence of repayments and a record of enforcing the terms, the more likely a court is to treat it as one. A loan with no interest, no repayments and no realistic expectation of repayment is the type of arrangement courts have been reluctant to recognise.

Each party should also get independent legal advice. Australian Family Lawyers warns that a court might set aside a loan if the borrower did not receive it.

Check with the Lender First

Speak to your child’s lender before you finalise anything. Many banks ask for written confirmation that deposit funds are a gift, and a loan that has to be repaid can reduce how much your child is able to borrow. Signing a gift letter and later claiming the money was a loan creates conflicting evidence. Your child’s mortgage broker or lender can confirm what they will accept.

Securing the Loan with a Mortgage

Some lawyers recommend securing the loan against your child’s property. Australian Family Lawyers says taking security over the home means you can expect to be repaid when the property is sold, much like a bank mortgagee.

A registered mortgage records your interest on the title, and it generally ranks ahead of unsecured creditors if the property is sold or your child becomes bankrupt. You would usually rank behind the main home loan lender, and that lender may need to consent to a second mortgage. A caveat is a different tool that protects an unregistered interest, so ask your lawyer which option suits your situation.

Estate Planning and Sibling Fairness

A documented loan can also help with your estate planning.

If you have several children but only assist one with a house deposit, it can create unintended friction. When you pass away, a child who received an informal cash gift has effectively received an early inheritance, which may leave the others disadvantaged.

If the money is documented as a loan, the outstanding balance remains an asset of your estate. Your will can then forgive the loan or count it against that child’s share of the inheritance. How equal the outcome is depends on how the will is worded, and family provision claims can still be made, so this is one to settle with your lawyer.

Advanced Structures and Family Trusts

For larger contributions, some families look at holding and lending the money through a family trust rather than lending personally. The idea is that the trust, rather than the parents, becomes the lender, which can add flexibility around control and estate planning. Trust structures can also bring added cost, tax and stamp duty considerations, and it is not clear how a court would treat a trust that the child later controls. They are a specialist area, so speak with a lawyer and your financial adviser before going down this path.

Tax, Centrelink and Other Complications

Lending money to your children can have consequences beyond family law. Interest you receive on a loan may count as assessable income, and lending a large sum, particularly at a low or zero interest rate, can affect how Centrelink assesses your assets and income. The rules can be complex and depend on your age, your circumstances and how the loan is structured, so it is worth getting personalised advice from a licensed financial adviser before you proceed.

Seek Professional Advice

The decision to help your children financially is generous, but it should not compromise your own financial security. Before transferring any funds, speak with a lawyer, an accountant and a licensed financial adviser. They can help you draft a formal loan agreement, decide whether to secure it, check the tax and Centrelink implications and make sure the arrangement suits your family’s situation. Taking these steps helps ensure your wealth stays protected and your intentions are clear for years to come.