When purchasing a home using super (usually via an SMSF and an LRBA), you should consider a more substantial deposit than a conventional home loan requires. You must also maintain a significant cash buffer within the fund once the property has settled. In practice, this usually translates to a deposit in the 20–40% range (depending on the lender and situation) and a continuing liquidity buffer (usually a percentage of the property value) to assist the SMSF in servicing repayments and costs.
Purchasing property through an SMSF involves stringent conditions. Borrowing is typically structured as a Limited Recourse Borrowing Arrangement (LRBA), which is more complex and carries different risks compared to standard lending.
MoneySmart is also keen to point out that the terms of LRBA borrowing are highly stringent and that only one LRBA is typically taken out to purchase a single asset (such as one residential property). On its own, the property cannot be occupied by the members (or related parties) or rented out to members (or related parties). This becomes important due to the vacancy risk and the cash-flow planning implications associated with it.
The majority of SMSF lenders set Loan-to-Value Ratios (LVR) that are stricter than regular owner-occupier loans. It is common to find SMSF residential LVR limits at 70–80%, meaning a 20–30% deposit is required. You will also find guidance stating that SMSF loans need to have deposits in the wider 20–40% range, depending on lender policy and the profile of the property or borrower.
In particular, lenders and brokers stress that the cost of SMSF lending is usually higher, even if lenders view the asset as less risky than standard lending. This is one of the reasons why the deposit hurdle may seem even higher.
When individuals use the term "deposit," they are referring to the money the SMSF requires prior to gaining the ability to settle without financial strain. MoneySmart notes that when an SMSF buys property, it might attract various expenses that deplete your super balance, such as stamp duty, legal fees, advice fees, bank/loan costs, and property management costs (maintenance, rates, and insurance).
Since such costs accrue at approximately the same date as your deposit, a large number of SMSF trustees tend to accumulate funds materially above the headline deposit simply to avoid having to empty the fund to zero on settlement day.
One practical way to think about it is to account for three distinct buckets:
MoneySmart is direct about the main factor: your fund must be liquid enough to cover loan repayments, insurance payments, and property expenses (rates, property management, etc.). Furthermore, not only do some lenders require an SMSF to maintain a liquidity buffer following the purchase, but you also need enough liquidity to successfully complete the settlement.
Layer 1: The liquidity buffer required by the lender
One lender requirement is a buffer, usually maintained in cash and/or liquid investments. This is typically quoted at about 5–10% of the value of the property. Commentary directed at SMSF trustees also mentions that lenders might seek a buffer of approximately 10% of the property value (cash and/or shares) to assist in meeting expenses and covering tenant-loss periods.
Layer 2: The operating buffer in real life
Trustees often decide to keep additional operating cash beyond the lender's request, as property cash flow can be irregular and unforgiving: damage occurs, tenants vacate premises, and loan rates can change.
One practical (and friendly) method of establishing an operating buffer is to find a rough estimate of the monthly "all-in" property expenses of your SMSF, and have a second buffer expressed not as a percentage, but as months. For example:
This method goes hand-in-hand with the lender buffer as it is calculated on the actual rate at which your fund is being burned, rather than just the price of the property.
Layer 3: The "annoying-yet-unavoidable" expenses buffer
An SMSF form of property ownership may also be subject to continuing expenses that are easy to underestimate initially (insurance, rates, property management, maintenance). MoneySmart highlights these as a reality of constant fees. Having a small "admin and compliance" bucket in your cash reserves will help you avoid selling investments at the wrong time just to meet with the auditor or pay an unexpected bill.

After penciling in a deposit and a buffer, test your stress. It is at this point that you discover whether the plan is strong or merely wishful thinking.
The following are stress tests that can be readily executed in a spreadsheet:
Also, remember a structural constraint: MoneySmart alerts you that you cannot make any modifications that transform the nature of the property until the SMSF property loan is paid off. This matters for buffers, as it reminds you not to rely on moving away from the revenue cycle by refurbishing the premises later while the LRBA is in effect.
MoneySmart suggests consulting a licensed financial adviser (and points out that anyone who gives advice on an SMSF must have an AFS licence). It also warns against adviser groups who refer one another, as such referral fees pose a conflict that may compromise the advice you are given.
It is at this point that a second opinion—for example, an independent real estate investment advisory discussion—can be a wise way to stress-test the deposit plan and the liquidity buffer, and to ensure that a property-heavy approach is a sensible fit for the risk profile of your fund.