When to Buy a Duplex as Your First Home

A duplex can work as your first home if you want to live in one side and rent the other.

The rental income helps with the mortgage, and you still qualify for first home buyer concessions as long as you live in one unit. You will need to show lenders you can service the full loan without relying entirely on rent, but the approach can turn an unaffordable property into something that works. For landscapers with irregular income, the extra cash flow matters.

What Lenders Look At When You Buy a Duplex

Lenders treat a duplex differently depending on how you use it. If you live in one side and leave the other vacant, they assess it as an owner-occupied purchase. If you rent out the other half, they will usually only count 80% of the rental income when calculating your borrowing capacity, because rent is never locked in. You still need to prove you can service the mortgage if the tenant leaves.

Consider someone running a small landscaping business buying a duplex where one side rents for $450 per week. The lender will use $360 per week in their assessment, not the full amount. If your business income varies seasonally, you will need to show at least two years of tax returns and possibly a Business Activity Statement to prove consistent earnings. The rental income helps, but it does not replace the need for solid proof of your own income.

How First Home Buyer Grants Apply to a Duplex

You can access first home buyer stamp duty concessions and grants on a duplex as long as you intend to live in one of the dwellings. Each state sets a cap on the purchase price, and most grants apply only to new builds. In Queensland, you can claim up to $30,000 if the duplex is new and under $750,000, but that grant expires on 30 June 2026. In New South Wales, you can access a $10,000 grant for a new duplex under $600,000, or stamp duty relief up to $800,000.

If you buy an established duplex, you will miss out on the grant but may still qualify for reduced or zero stamp duty depending on the state and the price. Tasmania offers no stamp duty on established homes up to $750,000 for eligible buyers until 30 June 2026, which makes an older duplex more affordable upfront.

Using the First Home Guarantee on a Duplex Purchase

The First Home Guarantee lets you buy with a 5% deposit and avoid Lenders Mortgage Insurance, which is a big cost saver on a duplex because the purchase price is usually higher than a standalone unit. From October 2025, the scheme removed income caps and place limits, so more buyers qualify.

You can use this scheme on a duplex as long as you live in one of the units and the total property value stays under the cap for your state. The property must also meet standard lending criteria, which means it needs separate titles or a strata structure that lenders will accept. Some lenders are cautious about duplexes on a single title because they can be harder to sell, so getting pre-approval before you start looking will tell you what the lender will accept.

Deposit and Costs for a Duplex Purchase

A duplex will cost more than a standalone unit, so your deposit and upfront costs will be higher. If you are using a 5% deposit scheme, you still need genuine savings plus enough to cover settlement costs like conveyancing, building inspections, and strata reports if the duplex is on a strata title.

You can use gifted funds from family for part of your deposit, but most lenders will want to see at least some of your own savings. If you have been contributing to the First Home Super Saver Scheme, you can withdraw up to $50,000 to put toward your deposit. That can make the difference if you are self-employed and building up savings has been slow because of business expenses.

How Rental Income Affects Your Loan Application

Rental income from the second unit will show up in your serviceability calculation, but lenders discount it. They assume vacancies, maintenance, and the possibility that the tenant might leave. Most lenders use 80% of the expected rent, and they will want to see a rental appraisal before they finalise your approval.

If you are self-employed as a landscaper, showing a combination of business income and rental income can strengthen your application, but you cannot rely on the rent to do all the heavy lifting. The lender will still want proof that your business is generating consistent cash flow. If your business has only been operating for 12 months, some lenders will not accept the income at all, which makes the duplex option harder unless you have other income or a co-borrower.

Duplexes on a Single Title Versus Strata Title

Some duplexes sit on a single title, which means you own both units and the land as one property. Others are on separate strata titles, where each unit is its own legal entity. Lenders generally prefer strata titles because they are easier to value and sell. A duplex on a single title can limit your options later if you want to sell one side or refinance just one unit.

If you buy a duplex on a single title and later want to subdivide, you will need council approval and a surveyor, which adds time and cost. Some councils in outer suburbs make subdivision straightforward, while others have minimum lot sizes or zoning restrictions that make it unworkable. If you are looking at a duplex on one title, check with the local council before you commit.

What Happens If You Want to Move Out Later

If you buy a duplex as your first home and later move out to rent both sides, your loan will need to convert from owner-occupied to investment. That usually means a higher interest rate, because investment loans carry more risk for lenders. You will also lose access to the full offset account on some loan products, depending on your lender.

Some buyers plan to live in one side for a year or two, then move out and keep the duplex as an investment. If that is your plan, structure the loan with flexibility from the start. Look for a product that allows you to switch without break costs or penalties, and avoid locking into a long fixed term unless you are certain you will stay.

Choosing the Right Loan Structure for a Duplex

Most buyers use a standard variable loan with an offset account, which gives you flexibility and lets you park your business income in the offset to reduce interest. Some lenders offer split loans, where part of the loan is fixed and part is variable, which can smooth out repayments if rates move.

If you are earning irregular income from your landscaping work, an offset account is worth more than a redraw facility because you can access your funds without approval from the lender. You can also use the offset to manage your tax, keeping business income separate from personal cash while still reducing your interest bill.

Call one of our team or book an appointment at a time that works for you. We will walk through your income, your deposit, and what lenders will accept for a duplex purchase, so you know what you can afford before you start looking.

Frequently Asked Questions