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Looking to build a duplex as an investment property? As part of the changes in the May 2026 Federal Budget, building a new duplex on the site of an older home may continue to qualify for negative gearing and the 50% capital gains tax discount, while investments in established dwellings may not.
A duplex is two self-contained dwellings on a single site. The same property configuration is referred to as a dual-occupancy in Victoria, and a duplex in NSW and most other states. As an investment, a duplex provides two potential rental income streams from one block of land.
This guide explains how negative gearing applies to a duplex investment, how the financing works from site purchase through to construction, and what lenders assess. If you have any questions about your situation, our local team is available to chat at a time that suits your schedule.
The investment proposition for duplex properties has strengthened considerably in 2026. This reflects two principal reasons, mainly the revision of negative gearing provisions, and the broadening of rules governing where these dwellings may be constructed.
Firstly, in the May 2026 Federal Budget, the Government announced changes to property tax concessions aimed at directing investment towards new housing supply. The Budget proposed limiting negative gearing and the 50% capital gains tax discount to investments that add new housing to the market. Established dwellings may no longer qualify, but newly built homes can, including a duplex built through a knock-down rebuild that replaces a single, free-standing house.
In parallel, state planning rules are evolving to make duplexes and similar dwellings easier to get approved, with New South Wales (NSW) and Victoria among the states moving in this direction. In NSW, the Government's Low and Mid-Rise Housing Policy now allows medium-density housing, including duplexes and townhouses, across more residential zones in Greater Sydney. According to independent analysis by the Grattan Institute, the reforms have made over 400,000 R2-zoned sites eligible for this type of redevelopment.
This is particularly relevant in middle-ring suburbs, where larger blocks with older single dwellings are more common. Combined with the proposed tax changes, these planning reforms may shift investor preference toward new builds, with duplexes a likely focus.
Negative gearing occurs when the costs of owning an investment property are higher than the rental income it earns. The resulting loss may be deductible against your personal and other income, depending on your tax situation. Negative gearing on a duplex investment occurs when the rental income generated by both dwellings is less than the costs of holding the property. These costs typically include loan interest, council rates, water, insurance, strata fees and property management.
A new build may also generate additional non-cash deductions through depreciation. The resulting loss may be deductible against your other taxable income, depending on your circumstances and the tax rules in force at the time. The financial outcome of any duplex investment depends on the property, the build cost, the interest rate, rental yields in the area and your personal tax position. Speak with a registered tax adviser before relying on any specific calculations.
A duplex home loan or a dual-occupancy home loan usually involves two facilities: a loan to buy the property, whether on an investment or owner-occupier basis, and a construction loan to fund the build. The property can be a vacant land, or an established home you knock down and rebuild. Yard supports both paths, depending on whether you have a fixed price build contract in place at the time of purchase.
If you have both a Contract of Sale for the property and a fixed price build contract ready at the time of purchase, Yard can fund the project through a duplex construction loan. The purchase settles and the construction component sits ready to draw down in stages as the build progresses.
Whether you are buying vacant land or an established home to knock down and rebuild, Yard can initially fund the site purchase through a property loan if a fixed price build contract is not ready in time for settlement. Once you have the fixed price build contract in place, the loan can be increased to release construction funds. The additional borrowing is based on the “as if complete” value of the finished duplex.
Lenders typically assess the same criteria used for a standard home loan when evaluating an application for a duplex home construction loan. This includes a credit assessment and property valuation. Your income, employment, expenses and existing financial commitments, such as credit cards, personal loans and car finance, are assessed to help determine your loan serviceability.
If you are self-employed, you may not have two years of standard tax returns to provide. In this case, alternative income verification may be considered, such as an accountant's letter, Business Activity Statements (BAS) or business bank statements. Read more about our self-employed home loan options.
Your credit history will also be reviewed, including your repayment history, any missed payments or defaults. Lastly, you will also require a deposit. In many cases, this is around 20% of the combined value of the land and construction cost.
In addition to your financial information, lenders will also require the following paperwork related to your construction project:
Your lender will use an independent property valuer to estimate the expected value of your property when completed. Using all this information, they will calculate how much you can borrow for your project. The valuer will visit your project throughout the construction phase to conduct further valuations and inspections.
Before approving the construction funds, the lender orders an “as if complete” valuation. This is the valuer's estimate of what the finished duplex will be worth, and is used to set the amount the lender will lend for the build based on your serviceability and the acceptable loan-to-value ratio.
Once approved, the construction loan component is paid out in stages as the build progresses. Interest is only charged on the amount drawn down, which means your interest cost is lower in the early stages of the build.
Progress payments are typically paid in six stages:
Once the duplex is finished and an occupancy certificate has been issued, lenders would typically convert the construction loan to a standard home loan.
Yard is a non-bank lender that specialises in supporting duplex investment projects through construction loans, vacant land loans and bridging finance, with both full doc and low doc options available. We assess each application individually, including applications from self-employed borrowers and those purchasing through company or trust structures. Where standard tax returns are not available, we can use alternative income verification such as an accountant's letter, Business Activity Statements (BAS) or business bank statements. Read more about our self-employed home loan options and investment property home loans.
Every Yard customer works with a dedicated Yard Loan Consultant who manages the application from initial enquiry through to settlement, including the assessment of progress payments at each stage of the build. To discuss a duplex project, speak with us today or apply online.
Yes, in some cases. Equity in another property may be used to reduce or replace the cash deposit. How this works depends on your current loans, your lender's policy and your overall financial position. A Yard Loan Consultant can talk you through the options.
Yes. Yard works with self-employed applicants and business owners for construction lending. Where standard lodged tax returns are not available to evidence income, we may be able to consider alternative income verification, including an accountant's letter or BAS. Each application is assessed individually.
Both rental incomes from the two dwellings may be considered when assessing your borrowing capacity, subject to your lender’s policy. Lenders typically apply a shading factor to the estimated market rent to allow for vacancy periods and holding costs. Where rental income from both dwellings is included, it may help support a higher borrowing position compared to a single rental property on the same site.
You will need personal identification and income evidence, the signed site purchase contract, a fixed-price building contract, council-approved plans, proof of builder's licence and insurance and progress inspection reports during the build. If you are self-employed, you may be able to provide an accountant’s letter, BAS, or business bank statements as an alternative to tax returns through a low-doc home loan.
An “as if complete” valuation is a valuer's estimate of what the finished duplex will be worth once built. The lender uses this figure to set the maximum amount it will lend for the build. If the assessed value is lower than your total project cost, you will need to contribute additional funds.
You can get started in minutes by completing an online application here. A Yard Loan Consultant will reach out within 24 hours. Simply tell us about the property you’re purchasing or refinancing and provide a quick overview of your income, employment, assets, and expenses.
Once submitted, your dedicated Loan Consultant will review your requirements and guide you through the next steps. You’ll then upload your supporting documents through our secure portal, and we’ll assess your application. The assessment typically takes two business days, and once approved, you’ll receive and sign your loan documents online. We’ll then coordinate directly with your conveyancer to complete the settlement. Read more on how to apply for a Yard loan here.
New loan inquiries: hello@yard.com.au
Service requests: help@yard.com.au
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