Bank of Mum and Dad: Why a Written Agreement Can Make Sense

It is one of Australia's quiet financial realities. While banks set ever higher deposit hurdles, more first home buyers are turning to a different kind of lender: their parents. The mum and dad bank has become one of the most travelled paths into homeownership in this country, and with average contributions topping $30,000, it is serious money changing hands. What often gets skipped, though, is the paperwork.

Osinski Finance is a family-owned mortgage brokerage in Rockingham, WA. We guide first home buyers through the lending process every week. We see first-hand what happens when the details of a family financial arrangement have been left vague, and we know exactly what lenders need to see to keep an application on track.

Quick Answer: What Is the Bank of Mum and Dad?

Mum and Dad bank refers to any financial assistance parents or close family members provide to help an adult child purchase their first home. That support can take several forms: a direct cash gift, a formal or informal loan, or parents agreeing to act as guarantor on the home loan itself.

Research shows around 60% of first home buyers have drawn on this kind of support, with contributions averaging more than $30,000. Despite how common this is, as many as 64% of buyers relying on family support have no paperwork in place at all. That gap is where things go sideways at application time.

Whether you are the buyer receiving the help or a parent trying to structure things sensibly, getting the documentation right protects everyone and keeps the process smooth. Our team can walk you through what to prepare.

Why the Bank of Mum & Dad Is Now Part of the Property Landscape

In general, parents provide funds to their children as a loan, a gift, or an early inheritance.

For first home buyers, this injection of cash can cut the time taken to save a deposit, or push a deposit to 20%, which is the point at which buyers can typically avoid paying lenders' mortgage insurance without relying on government scheme support. A larger deposit can also unlock access to sharper interest rates.

Parents also help in less direct ways: allowing adult children to live at home rent-free to fast-track their savings, or putting their own property equity to work to back part of the loan. Each of these arrangements has different implications for how a mortgage application is assessed.

Gift, Loan or Guarantor: Understanding the Three Structures

Not every bank of mum and dad arrangement works the same way, and lenders treat each one differently. Understanding the structure before you apply can prevent delays, missed paperwork, and confusion when it matters most.

Cash Gift From Parents

A gift is a non-repayable contribution to the deposit. Because there is no obligation to repay it, the lender will not include it as a financial liability in your serviceability assessment. Research confirms many parents genuinely intend the money this way: nearly 49% of parents who provide financial assistance say they do not expect to be repaid, and more than a quarter (26%) describe the contribution as an outright gift.

For a gift, you will generally need a statutory declaration signed by a Justice of the Peace, confirming no repayment is expected. This is the document that allows your lender to treat the funds as a genuine, liability-free contribution to the deposit.

Family Loan

If your parents want the money back, the lender needs to know. A family loan means the lender will assess whether the money is a gift or a loan and, where repayments are expected, factor those into your borrowing capacity. This can reduce the maximum amount you qualify to borrow.

A written loan agreement is essential: it protects both you and your parents, gives the lender exactly what it needs, and heads off any future misunderstanding about repayment expectations. A solicitor can prepare one that clearly sets out the amount, the repayment terms, whether interest applies, and what happens if circumstances change.

Using a Guarantor Home Loan

A home loan guarantor is a different structure altogether. Rather than contributing cash, parents use the equity in their own property to provide additional security for part of your loan. This can allow a buyer to avoid paying lenders' mortgage insurance without a 20% deposit, which can be a significant saving in the early years of ownership.

A family guarantee home loan works along the same lines: the parent's property is pledged to cover a defined portion of the loan, reducing the lender's exposure. The guarantee can typically be released once the borrower has built enough equity in their own property, usually around the 20% mark.

It is important to understand that a guarantor carries real financial exposure. If repayments fall behind, the lender may pursue the guaranteed portion against the parent's property. Independent legal advice for both parties, before anyone signs anything, is not a box-ticking exercise: it is a genuine safeguard.

How Lenders Assess Funds from Parents

When family financial assistance is part of a home purchase, the lender will ask questions about the source and structure of those funds. Their concern is straightforward: they need to understand your actual financial position and confirm you can comfortably service the loan over its full term.

For a cash gift, a statutory declaration from the parent is usually sufficient. For a family loan, the lender may request the written agreement and will factor repayment obligations into the serviceability calculation. For a guarantor home loan, the lender will conduct a separate assessment of the guarantor's financial position and the equity available in their property.

Having this documentation ready before you apply avoids the delays that come from chasing paperwork mid-application. Ambiguity about where a deposit came from is one of the most common reasons home loan applications stall.

A New Reason to Have Everything in Writing in 2026

The documentation case has grown stronger this year. New anti-money laundering laws that took effect on 1 July 2026 require real estate agents to verify the identity of home buyers and, in certain transactions, ask about the source of funds used to buy a home.

If your deposit includes a contribution from parents, having a document that clearly describes the nature of that arrangement means you can answer those questions immediately, rather than scrambling for evidence when you are days from settlement.

This requirement sits at the real estate transaction stage, separate from the lender's own documentation requirements. Being prepared for both is simply the smart approach in 2026.

What Documentation You Actually Need

The right paperwork depends on how the arrangement is structured.

For a Cash Gift

A statutory declaration signed by the parent at a local Justice of the Peace is the standard requirement. It confirms the money is a non-repayable gift, satisfying both the lender and any real estate agent verification obligation under the new AML laws.

For a Family Loan

A formal written loan agreement, ideally prepared by a solicitor, is the right move. It should clearly state the amount, the repayment schedule or confirmation that no repayments are expected, and any interest terms. Solicitor advice is worthwhile where amounts are significant, to ensure both parties are properly protected.

For a Guarantor Arrangement

The lender will typically prepare specific guarantee documentation, and both borrower and guarantor will need independent legal advice before signing. This is not optional: responsible lenders require it to ensure the guarantor genuinely understands the financial obligation they are taking on.

What First Home Buyers Should Keep in Mind

Family support can be a genuine leg-up, particularly when saving for a deposit feels like it is taking forever. But the parental contribution is only one part of what lenders look at.

Genuine Savings Still Matter

Most lenders want to see a pattern of regular saving, typically evidenced across at least three to six months of bank statements. This evidence of genuine savings shows the financial discipline to manage a mortgage over the long term. A deposit made up entirely of gifted funds, without any savings history to support it, can limit your lender options. Maintaining your own savings habit alongside any family contribution is worth doing.

Your Income Does Most of the Heavy Lifting

Even with a generous cash contribution or a family guarantee home loan in place, your own income is still the primary driver of how much you can borrow. Lenders assess whether you can meet repayments comfortably over the life of the loan. Family support helps you get started; your income determines what you can sustain.

Key Takeaways

• An estimated 60% of first home buyers in Australia have used the bank of mum and dad, with average contributions of more than $30,000.
• Family financial assistance can be structured as a cash gift, a family loan, or a home loan guarantor where parents use their property equity as additional security.
• Each structure requires different documentation: a gift needs a statutory declaration; a loan needs a written agreement; a guarantor arrangement requires formal guarantee documents and independent legal advice for both parties.
• From 1 July 2026, new anti-money laundering laws require real estate agents to verify the source of purchase funds, making written documentation more important than ever.
• Genuine savings history is still expected by most lenders alongside any family contribution.
• Getting the paperwork sorted before applying avoids delays and keeps the application process smooth from start to settlement.

Talk to Osinski Finance About Buying Your First Home

Using the bank of mum and dad can make buying your first home more achievable, especially with the right loan structure. Osinski Finance is a family-owned mortgage broker in Rockingham, WA, with access to nearly 100 lenders across Australia. We work with clients looking to buy their first home, access home loan options across our lender network, or invest in property. 

Get in touch today to discuss your first home loan.

Frequently Asked Questions

Can my parents give me money to buy a house in Australia?

Yes. Parents can give money to help their children purchase a home in Australia, and it is one of the most common forms of first home buyer support. When the money is a genuine gift with no expectation of repayment, the lender will typically require a statutory declaration signed by the parent at a Justice of the Peace, confirming the non-repayable nature of the gift. This prevents the lender from treating the funds as a financial liability in the serviceability assessment. There is no official legal cap on the amount a parent can gift in the context of a home purchase, but lenders and real estate agents may request documentation showing the source of the funds. Having this prepared before you apply keeps the process moving.

What is the Bank of Mum and Dad loan agreement?

A Bank of Mum and Dad loan agreement is a written document that formalises the terms of a financial loan between parents and an adult child for the purpose of purchasing a home. It sets out the loan amount, whether interest applies, the repayment schedule, or a clear statement that no repayment is expected. Lenders will ask about the nature of any family financial assistance, and a formal agreement is the clearest way to answer that question and avoid it affecting your borrowing capacity. Where significant amounts are involved, having a solicitor prepare the document ensures both parties are properly protected. Without written terms, differing expectations about repayment can create family complications later.

How does the Bank of Mum and Dad work?

The bank of mum and dad describes any financial assistance that parents or close family members provide to help someone buy a home. That help can be a cash gift to supplement a deposit, a loan repayable over time, or a formal guarantee arrangement where parents use equity in their own home as security for part of the loan. The arrangement is agreed between family members and then documented for the mortgage lender, which will ask about the source of the deposit and whether any repayment obligations exist. Because lenders treat gifts, loans, and guarantees differently, the structure chosen affects both the documentation required and the buyer's borrowing power. A mortgage broker can explain how your specific arrangement will be assessed before you lodge an application.

What is a guarantor home loan and how does it work?

A guarantor home loan is a lending arrangement where a parent (or other family member) uses the equity in their own property to provide additional security for part of a home loan, rather than contributing cash. This can allow a first home buyer to avoid paying lenders mortgage insurance without needing a full 20% deposit, which represents a meaningful cost saving. The guarantee typically covers a defined portion of the loan and can be released once the borrower has repaid enough to hold a strong equity position in their own property. If the borrower falls behind on repayments, the lender may pursue the guaranteed amount against the guarantor's property, which is why independent legal advice for both parties is essential before signing.

What is a family guarantee home loan?

A family guarantee home loan is a specific loan structure where a parent's property is pledged as additional security to reduce the loan-to-value ratio of a first home buyer's mortgage. Rather than providing cash, the parent is lending their equity. This can allow the buyer to access a higher loan amount or avoid lenders mortgage insurance without the parent needing to liquidate savings. The guarantee typically covers a portion of the loan and can be removed once the borrower's equity reaches a sufficient level. A low deposit home loan with a guarantee structure is worth discussing with a broker, as different lenders apply different conditions to how guarantees are structured and released.

Will a parental loan affect how much I can borrow?

Yes, a loan from parents can reduce your borrowing capacity. Lenders factor regular repayment commitments, including those owed to family members, into their serviceability assessment alongside all other financial obligations. This can lower the maximum loan amount you qualify for. This is precisely why the gift versus loan distinction matters so much: if the money is a genuine gift, properly documented with a statutory declaration confirming no repayment is expected, it does not count against your borrowing capacity at all. Speaking with a mortgage broker before you apply is the clearest way to understand how your specific arrangement will be treated across different lenders.

What documentation does a lender need for a gifted deposit?

For a cash gift from parents, the standard requirement is a statutory declaration signed by the parent at a Justice of the Peace, confirming the money is a non-repayable gift. Some lenders may also request bank statements showing the transfer of funds. The declaration resolves the lender's core question about whether the deposit includes any repayable obligation. From July 2026, new anti-money laundering laws also require real estate agents to ask about the source of purchase funds, so having documentation ready at the time of sale, not just at the loan application stage, is a practical advantage.

What are genuine savings and why do lenders care about them?

Genuine savings refers to funds that have been built up over time through regular contributions to a savings account, typically demonstrated across at least three to six months of statements. Lenders use this as evidence of financial discipline and the capacity to manage ongoing loan repayments. A deposit made up entirely of gifted or borrowed funds, without any genuine savings history to support it, can limit which lenders and products are available to a borrower. Maintaining a personal savings habit alongside any family contribution gives you more options and demonstrates financial readiness to the lender.

How do the 2026 anti-money laundering laws affect home buyers?

Anti-money laundering laws that came into effect on 1 July 2026 extended compliance obligations to real estate agents, who must now verify buyers' identities and, in some transactions, ask about the source of funds used to buy a property. For buyers whose deposit includes a contribution from parents, this means you may be asked to demonstrate the origin of those funds at the point of sale, not only at the mortgage application stage. A statutory declaration or written loan agreement already in hand answers this question directly and avoids any delay when you are close to exchanging contracts. Many buyers are not yet aware of this requirement, so being prepared early is a real advantage.

Should I use a mortgage broker when buying with help from my parents?

Working with a mortgage broker is particularly valuable when family financial assistance is part of the picture. Different lenders apply different policies to gifted deposits, family loans, and guarantor arrangements, and a broker can match you to lenders whose criteria suit your situation. A broker can also help you understand genuine savings requirements, advise on how to document the arrangement correctly, and explain the implications of different guarantee structures for both you and your parents. At Osinski Finance, we guide first home buyers through exactly this process, drawing on a panel of nearly 100 lenders across Australia to find the right fit.

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