A duplex investment gives you two rental incomes under one title, but it also changes how lenders assess your application and which loan features make sense for your situation.
For self-employed buyers in Sydney, the difference between securing finance and being declined often comes down to how your income is presented and whether the duplex meets servicing requirements as a single asset or as two separate dwellings. Lenders treat duplexes differently depending on whether both units are rented, one is owner-occupied, or the property is held under strata or Torrens title. That treatment affects your borrowing capacity, the rate you receive, and the deposit you need.
Why Duplexes Are Assessed Differently to Single Dwellings
Lenders calculate rental income at 75 to 80 per cent of gross rent to allow for vacancy and costs. When you rent both halves of a duplex, the combined income is assessed, but so is the combined exposure. Some lenders apply a higher vacancy buffer or require a larger deposit if both dwellings are on one title, particularly in suburbs where rental demand fluctuates or where body corporate arrangements add recurring costs.
Consider a buyer who operates a consulting business and wants to purchase a duplex in Parramatta. Their tax returns show net profit after deductions, but their accountant has structured the business to reduce taxable income. The lender calculates serviceability using a two-year average of declared profit, plus any add-backs for non-cash deductions such as depreciation. If one unit of the duplex is occupied by the buyer and the other is rented, the lender treats the property as part owner-occupied and part investment. That split changes the interest rate applied, the loan-to-value ratio required, and the serviceability calculation. In this scenario, the buyer's deposit increased from 10 per cent to 15 per cent because the lender classified the entire asset as investment despite the owner-occupied component.
How Self-Employed Income Is Verified for Investment Lending
Most lenders require two years of financial statements or tax returns to assess self-employed income. Some will accept one year if you have held an ABN for 12 months or more, but the interest rate and deposit requirements are often higher. The income used is the net profit shown on your tax return, adjusted for add-backs such as depreciation, amortisation, and one-off expenses. If your accountant has minimised taxable income to reduce your tax liability, your assessed income for the loan will also be lower.
Lenders also apply a loading for business structure. If you operate through a company or trust, some lenders reduce the income recognised or require a personal guarantee. Others will not lend to discretionary trusts at all for investment loans, particularly if the trustee is a corporate entity. If your business shows strong cash flow but low declared profit, you may be asked to provide BAS statements, transaction account records, or an accountant's letter confirming sustainable income.
What Deposit You Need and When LMI Applies
The minimum deposit for an investment property is usually 10 per cent of the purchase price, plus costs. Lenders Mortgage Insurance applies if your deposit is less than 20 per cent. For self-employed buyers, some lenders will not approve loans above 80 per cent LVR unless you have been trading for at least two full financial years and can show consistent income. If you are borrowing at 90 per cent LVR, expect fewer lender options and higher rates.
If you are using equity from an existing property to fund the deposit, the lender will revalue that property and assess your total exposure across both loans. The equity release must leave at least 20 per cent equity in the original property after the new loan settles. If the revaluation comes in lower than expected, you may need to contribute additional cash or reduce the purchase price.
Interest Only Repayments and Cash Flow for Dual Rental Income
Interest only repayments are common for investment loans because they reduce the monthly outgoing and improve cash flow. The interest only period is typically one to five years, after which the loan reverts to principal and interest unless you request an extension. Not all lenders will extend interest only periods for self-employed buyers, particularly if your income has decreased or if the property has not increased in value.
For a duplex generating two rental incomes, the cash flow advantage of interest only is significant. If each unit rents for $650 per week, your gross rental income is $67,600 per year. The lender assesses 75 per cent of that, or $50,700. Your interest cost on a loan of $900,000 at a variable rate of around 6.5 per cent is approximately $58,500 per year. The property is negatively geared, and under current rules you can offset the loss against your other income. If you purchased the duplex after 12 May 2026, you need to confirm whether the property qualifies as an eligible new build under the negative gearing changes that take effect from 1 July 2027. If it does not, losses will be quarantined and can only be offset against other residential rental income or carried forward.
Variable Rate, Fixed Rate or a Split Strategy
Most lenders offer both variable and fixed rate options on investment loans. Variable rates give you flexibility to make extra repayments and redraw funds, which matters if you plan to use the loan account as a working facility. Fixed rates lock in your repayment for a set period, usually one to five years, but often come with restrictions on extra repayments and no redraw.
A split loan lets you fix part of the balance and leave the rest on a variable rate. If you fix 50 per cent of the loan, you have certainty over half your repayment and flexibility over the other half. The downside is that you pay two sets of fees and managing the loan becomes more involved. For self-employed buyers with variable income, a split can smooth your exposure to rate movements without locking you into a structure that limits access to funds when you need them.
When Refinancing Makes Sense After Settlement
Once the duplex has settled and you have tenants in place, you may be able to refinance to a lower rate or access equity for further investment. Lenders reassess your income and the property value at the time of refinance. If your business income has increased or the property has appreciated, you may qualify for a better rate or a higher loan amount. If your income has dropped or the property value is flat, refinancing may not deliver any benefit.
Refinancing also allows you to consolidate debt or restructure your loan to interest only if the original loan has reverted to principal and interest. Some lenders offer discounted rates for existing clients or waive application fees if you have a strong repayment history. Others will not refinance self-employed buyers unless they can provide updated financials showing two full years of income at the new level.
Body Corporate Costs and How They Affect Serviceability
If the duplex is registered under strata title, body corporate fees apply. Lenders deduct these fees from your rental income when calculating serviceability. In some complexes, body corporate fees are minor. In others, particularly where there is shared land or common facilities, the fees can be $2,000 to $4,000 per year or more. Check the strata report before you exchange contracts, and factor the cost into your cash flow.
Some lenders also reduce the assessed rental income if the body corporate has a history of special levies or if the sinking fund is below the recommended level. If the strata report shows deferred maintenance or pending litigation, some lenders will not approve the loan at all until those issues are resolved.
How APRA's Debt-to-Income Cap Affects Duplex Purchases
From 1 February 2026, lenders are limited in how many new investment loans they can write at a debt-to-income ratio of six times or greater. If your total debt, including the new duplex loan, exceeds six times your gross income, the lender may decline the application or require a larger deposit to bring the ratio down. This cap applies separately to investment and owner-occupied lending, so your existing home loan does not count toward the investment DTI limit.
For self-employed buyers, the income figure used is the lender's assessed income, not your gross business turnover. If your add-backs and averaging reduce your income to $120,000, your maximum borrowing under the DTI cap is $720,000. If you already have $200,000 in investment debt, the new loan cannot exceed $520,000 without triggering the cap. Some lenders have internal DTI limits below the regulatory cap, so the threshold may be lower depending on who you apply with.
Structuring the Loan When You Plan to Subdivide Later
Some buyers purchase a duplex on one title with the intention of subdividing and selling one unit later. If that is your plan, tell your broker before you apply. Not all lenders will allow a partial discharge on a single loan. Some require the loan to be split into two separate accounts at settlement, each secured against a specific unit. Others will allow a future subdivision but charge a fee to split the loan or require a minimum amount to be repaid before the discharge is approved.
If you intend to subdivide, the property must be zoned appropriately and council approval must be in place or achievable. The lender may require a copy of the subdivision plan or a letter from your solicitor confirming the subdivision is feasible. If the subdivision is not yet approved, some lenders will decline the application or limit the loan to 70 per cent LVR until the subdivision is registered.
Call one of our team or book an appointment at a time that works for you. We work with self-employed buyers across Sydney and can structure your investment loan to fit both your immediate needs and your longer-term plans for the property.
Frequently Asked Questions
Can I use one year of financials to get an investment loan for a duplex if I am self-employed?
Some lenders will accept one year of financials if you have held an ABN for at least 12 months, but you will usually face higher interest rates and deposit requirements. Most lenders prefer two full years of tax returns or financial statements to assess sustainable income.
How do lenders calculate rental income for a duplex with two units?
Lenders assess 75 to 80 per cent of the gross rental income from both units combined to allow for vacancy and maintenance costs. Some lenders apply a higher vacancy buffer if both dwellings are on one title or if the property is in an area with fluctuating rental demand.
What deposit do I need for a duplex investment if I am self-employed?
The minimum deposit is usually 10 per cent plus costs, but Lenders Mortgage Insurance applies below 20 per cent. Self-employed buyers may need a 20 per cent deposit to access a wider range of lenders, particularly if trading for less than two years or if income is variable.
Will negative gearing still work if I buy a duplex now?
If you purchase after 12 May 2026 and the property is not an eligible new build, losses will be quarantined from 1 July 2027 and can only be offset against other residential rental income or carried forward. Properties held before that date or eligible new builds can continue to be negatively geared under existing rules.
Can I subdivide a duplex after I purchase it and keep the same loan?
Not all lenders allow partial discharge on a single loan. Some require the loan to be split into two separate accounts at settlement, each secured against one unit. Check with your broker before purchasing if subdivision is part of your strategy.
