A duplex sitting on one title can qualify under the Australian Government 5% Deposit Scheme and most state stamp duty concessions, but only if the property meets specific eligibility rules.
Does a Duplex Count as a First Home for Scheme Purposes?
A duplex qualifies under the Australian Government 5% Deposit Scheme if it is classified as a residential dwelling and the purchase price sits within the applicable price cap for your location. The type of property structure does not disqualify you. Where buyers run into problems is when the duplex is registered on two separate titles or sits on land zoned for commercial or mixed use. Both issues will trigger a rejection at application stage.
In New South Wales, a duplex on a single title in a regional centre can be purchased under the scheme for up to $1,500,000. The same property registered as two separate titles would not be eligible. Confirm title structure with your conveyancer before applying for finance.
The second issue involves how the property has been built and whether it was constructed as part of a strata or community title subdivision. Survey-strata duplexes, where each side is separately titled, are excluded from the 5% Deposit Scheme. These properties may still qualify for state-based off-the-plan concessions, particularly in Western Australia, but not under the federal scheme.
How Lenders Assess Duplex Purchases for First Home Buyers
Lenders treat a duplex differently depending on whether you intend to occupy one side and rent the other, occupy the whole property, or purchase it purely for investment.
If you plan to live in one side and rent the other, the rental income can be used to support your home loan application, but most lenders will only count 80% of the projected rent toward serviceability. You will need enough personal income to cover the shortfall between your total loan repayment and what the rental income contributes. For a duplex valued at the current median in a location with moderate rent returns, you may be looking at needing an additional $65,000 to $75,000 in household income to make the numbers work.
If you occupy both sides or intend to use the property as your principal place of residence without renting either portion, the lender will assess it like any other owner-occupied purchase. The duplex structure is not a factor. The loan is treated as standard residential lending, and you can use a variable or fixed interest rate depending on your preference.
Purchasing with intent to rent both sides changes the loan category to investment. You lose access to the 5% Deposit Scheme and to most first home buyer stamp duty concessions that require owner-occupation. You would need a larger deposit, typically 10% to 20%, and rental income would be shaded at 80% for serviceability.
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Stamp Duty and Grant Eligibility on a Duplex Purchase
State and territory grants and stamp duty concessions can generally be used alongside the Australian Government 5% Deposit Scheme. Eligibility depends on whether the duplex is classified as new or established and whether you will occupy it as your principal place of residence.
In Victoria, a duplex on a single title qualifies for the full stamp duty exemption if valued under $600,000, or a sliding concession between $600,001 and $750,000. The concession applies to both new and established homes. If the duplex was purchased off-the-plan between October 2024 and April 2027, duty is calculated on the land value at contract date only, not the finished property value. This can reduce stamp duty substantially on a townhouse-style duplex valued above the standard exemption threshold.
In Queensland, a new duplex valued under $750,000 qualifies for the $30,000 first home owner grant. If the property is established, the grant does not apply, but you can still claim the first home concession on transfer duty. The concession provides a maximum deduction of $17,350 on properties valued up to $709,999, phasing out to nil at $800,000. Duty is reduced, not eliminated.
In Western Australia, a duplex registered under a survey-strata scheme and purchased off-the-plan or under construction between March 2026 and June 2028 now qualifies for the off-the-plan duty concession. This change brought duplexes into the scheme for the first time. The concession provides up to a 100% reduction on duty, capped at $50,000, for pre-construction contracts valued up to $800,000. The property does not need to be your first home to claim the concession, but it must meet the off-the-plan or under-construction criteria.
Borrowing Enough to Cover Deposit, Stamp Duty and Settlement Costs
A duplex purchase under the 5% Deposit Scheme removes the need for lenders mortgage insurance, but you still need to fund settlement costs separately. Stamp duty concessions reduce or eliminate one of the larger upfront expenses, but solicitor fees, building and pest inspections, and loan establishment costs still apply.
Consider a buyer purchasing a duplex under the scheme in South Australia. The property is a new build, so the buyer qualifies for both the $15,000 first home owner grant and full stamp duty relief with no price cap. The deposit is 5%, which the buyer has saved in a standard savings account. The grant is paid after settlement, so it cannot be used to cover initial costs. The buyer still needs to cover conveyancing, inspections, and loan fees at the point of settlement. These typically run between $8,000 and $12,000 depending on the property location and lender.
If the buyer has used the First Home Super Saver Scheme to build their deposit, they can apply to release eligible contributions from their superannuation fund to cover part of the upfront costs. Releases are capped at $50,000 total and must be requested from the ATO before contract signing.
Gifted deposits are accepted by most lenders under the 5% Deposit Scheme, provided the gift comes from an immediate family member and is accompanied by a signed statutory declaration confirming the funds are a genuine gift with no expectation of repayment. Some lenders require the buyer to contribute a minimum portion from their own genuine savings, typically 5% of the deposit, even when a gift is involved. Confirm this requirement before signing a contract.
Loan Features That Make Sense for a Duplex with Rental Income
If you are living in one side and renting the other, an offset account linked to your home loan lets you park your rental income and reduce the interest charged on your total loan balance. Interest is calculated daily, so every dollar sitting in the offset reduces what you pay. You keep access to the funds, which matters when you need to cover maintenance or repairs on the rental side without dipping into personal savings.
A redraw facility provides similar benefit if your lender does not offer an offset account, but access to redrawn funds can be restricted depending on the loan product. Some lenders impose minimum redraw amounts or processing delays. An offset account does not have those limits.
Splitting your loan between a fixed and variable rate can provide stability on part of your repayment while keeping the flexibility to make extra repayments on the variable portion. Fixed rates do not allow unlimited additional repayments without triggering break costs, so splitting the loan gives you some protection against rate rises while maintaining access to features like offset and redraw on the variable side.
If the duplex will eventually be fully rented and converted to an investment property after you move out, setting the loan up as owner-occupied initially and then switching to an investment rate later is common. Speak to your broker before doing this. Some lenders require you to stay in the property for a minimum period before allowing the loan category to change, and moving out too early can void your eligibility for state concessions that required owner-occupation.
Choosing a lender requires more than comparing advertised rates. Not all lenders participating in the 5% Deposit Scheme offer offset accounts or split loan structures. Confirm available loan features with your broker at the time of pre-approval, not after you have signed a contract.
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