Understanding the basics of investment property loans

What an investment loan actually funds

An investment loan funds the purchase of a residential property you intend to rent out rather than live in. The lender assesses your application differently to an owner-occupier loan because the property generates income and the interest may be tax deductible.

Consider a Hawthorne buyer who owns their home in the suburb and wants to purchase a unit in Coorparoo as a rental. The deposit, serviceability calculation and interest rate will reflect the investment purpose. Lenders typically require a larger deposit for investment purchases, and investor interest rates are usually higher than owner-occupier rates because investment loans attract higher risk weights under APRA's prudential framework. Most lenders will assess the rental income at 80 per cent of market rent to account for vacancy and costs, then add that reduced figure to your other income when calculating what you can borrow.

That 20 per cent vacancy buffer exists whether or not you expect the property to sit empty. It reflects lender policy, not your personal tenancy plan. The deposit requirement also steps up. Where you might borrow 95 per cent for an owner-occupied purchase with Lenders Mortgage Insurance, most banks cap investment lending at 90 per cent LVR, and some tighten further for borrowers with multiple properties.

Deposit size and equity options

You need at least 10 per cent of the purchase price as a deposit to access most investment loan products, plus another budget for settlement costs including stamp duty and legal fees. If you already own property, you may be able to use equity in that home rather than cash savings.

In our experience, Hawthorne homeowners with strong equity positions often leverage that equity to fund part or all of the deposit for an investment property elsewhere. Equity release works by increasing the loan on your existing home, secured against its value, and using those funds as a deposit on the new purchase. The new investment property then secures its own separate loan. Each loan is structured independently, which helps if you later want to sell one property without disturbing the other.

If you are drawing equity from your Hawthorne home to fund an investment deposit, the interest on that additional borrowing is generally deductible because the funds are being used for an income-producing purpose. Keep the loans separate and document the purpose clearly. Do not blend investment and private borrowing on the same loan facility, as that creates problems at tax time. You will also need to meet serviceability on both the increased home loan and the new investment loan combined.

How rental income affects borrowing capacity

Lenders add a portion of the expected rental income to your assessed income, but they apply a discount to account for periods when the property may sit vacant or require maintenance between tenancies.

Most lenders assess rental income at 80 per cent of the market rent. If a property in Bulimba is expected to rent for $600 per week, the lender will credit you with $480 per week in serviceability. That figure is added to your salary and any other income, then your total commitments are deducted to calculate your borrowing capacity. The 20 per cent haircut is standard across almost all lenders and reflects prudent risk management rather than a prediction of actual vacancy.

The borrowing capacity calculation also includes the serviceability buffer. As at the compilation date of the legislative brief supporting this article, APRA requires lenders to assess your ability to service the loan at an interest rate at least 3.0 percentage points above the actual loan rate. That buffer applies to both the investment loan itself and any increase to your home loan if you are using equity. Some lenders layer additional buffers on top of the APRA minimum, particularly for borrowers with multiple investment properties or high debt-to-income ratios.

Interest-only versus principal and interest repayments

You can structure an investment loan as interest-only for a set period, typically one to five years, or as principal and interest from the start. Each approach changes your cash flow and tax position.

Interest-only repayments are lower because you are not paying down the loan balance during that period. That structure can improve cash flow if the rental income does not fully cover the loan repayment, and it maximises your tax deduction because the loan balance stays higher for longer. Once the interest-only period ends, the loan reverts to principal and interest and the repayment increases. Many investors choose interest-only to preserve capital for further property purchases or to direct surplus cash into offset accounts linked to non-deductible debt such as their home loan.

Principal and interest repayments reduce the loan balance over time and build equity in the investment property. That equity can later be used to fund further purchases or provide a buffer if property values fall. The repayments are higher, which may result in a larger shortfall between rent and loan costs during the early years. If you are holding the property long term and want to reduce debt as you approach retirement, principal and interest from the outset may align with that strategy. Each loan can be structured differently, so if you hold multiple investment properties, you might run some on interest-only and others on principal and interest depending on your cash flow and wealth-building plan.

Fixed or variable rate for property investment

Investment loans are available with variable rates, fixed rates, or a split between the two. Your choice depends on your tolerance for rate movements and how long you plan to hold the property.

Variable rates move with the market, which means your repayment can rise or fall. That flexibility allows you to make extra repayments without penalty and to access features such as offset accounts and redraw. Most variable rate investment loans also allow you to refinance or sell the property without break costs. If rates fall, your repayment drops immediately. If rates rise, your repayment increases, and your cash flow tightens.

Fixed rates lock in your repayment for a set term, typically one to five years. You gain certainty, which helps if you are running the investment property with a thin margin between rent and repayments. The downside is inflexibility. Most fixed rate loans do not offer offset accounts, restrict extra repayments to a small annual cap, and charge break costs if you exit early. If you sell the property or refinance during the fixed period, those costs can be substantial. Many investors split their loan between fixed and variable to balance certainty with flexibility, fixing enough to cover their risk tolerance and leaving the rest variable to retain access to features and repayment flexibility.

Debt-to-income limits and portfolio lending

From 1 February 2026, APRA activated a debt-to-income lending limit requiring each lender to restrict new investor loans with a DTI ratio of six times or greater to no more than 20 per cent of their total new investor lending each quarter. That cap applies separately to investor and owner-occupier lending.

If your total debt across all properties is more than six times your gross household income, you fall into the capped cohort. Lenders still assess your serviceability, but your application also competes for a place within that 20 per cent quarterly allocation. In practice, that means some borrowers who meet serviceability may still be declined or offered a smaller loan if the lender has exhausted its high-DTI quota for that quarter. The limit applies to new lending only, so existing borrowers are not affected unless they apply for a new loan or increase.

For Hawthorne buyers building a property portfolio, this limit can become binding after two or three purchases, depending on income and property values. One response is to focus on paying down debt or increasing income before applying for the next loan. Another is to work with a broker who maintains relationships across multiple lenders, as each lender manages its own 20 per cent allocation independently. DC Finance structures applications with these limits in mind, particularly for clients adding to an existing portfolio.

Tax treatment of investment property costs

Interest on borrowings used to acquire or hold residential rental property is deductible against assessable income to the extent the property is rented or held to produce assessable income. Other costs, including council rates, insurance, property management fees, repairs and depreciation, are also deductible for the period the property is rented or genuinely available for rent.

For properties held at 7:30pm AEST on 12 May 2026, or for eligible new builds acquired after that date, losses from residential investment properties continue to be fully deductible against other income, including salary and wages, until the property is sold. That treatment is commonly referred to as negative gearing. If your investment property costs more to hold than it generates in rent, the shortfall reduces your taxable income and lowers your tax bill.

From the 2027-28 income year, losses related to established residential investment properties acquired after 7:30pm AEST on 12 May 2026 are deductible only against other income from residential properties, including capital gains on residential properties. Excess losses can be carried forward. If you are considering an investment purchase in Hawthorne or nearby suburbs, the timing of settlement relative to that date changes the tax treatment of any shortfall. Properties under contract awaiting settlement at 7:30pm AEST on 12 May 2026 are grandfathered under the old rules.

Separate your loans clearly and do not blend investment and private borrowing on the same facility. If you borrow to fund a deposit using equity from your home, keep that loan separate from your non-deductible home loan. Document the purpose of each borrowing and maintain separate loan accounts. That structure protects your deductions and simplifies record-keeping if the ATO requests supporting information.

Lenders Mortgage Insurance on investment loans

Under APRA's prudential framework, LMI may reduce a lender's capital requirement where the insurance covers losses up to at least 40 per cent of the loan amount and is provided by an APRA-regulated insurer. LMI is generally required on investment loans where the LVR exceeds 80 per cent.

The premium is calculated on a sliding scale based on loan amount and LVR, and the cost is borne by the borrower. For an investment purchase with a 10 per cent deposit, the LMI premium can run into thousands of dollars. Some lenders allow you to capitalise the premium by adding it to the loan amount, which avoids an upfront cash cost but increases your total borrowing and your ongoing repayments. State and territory stamp duty may apply to the LMI premium depending on your location.

If you are using equity from your Hawthorne home to fund a larger deposit, you can often avoid LMI altogether by keeping the investment loan LVR at or below 80 per cent. That approach increases the borrowing against your home but removes the premium cost on the investment loan. The decision depends on your cash flow, your appetite for higher debt against your home, and whether you want to preserve equity in your principal residence. There is no universal answer, but the difference in cost is worth modelling before you settle on a structure.

Choosing the right loan structure for growth

If you plan to acquire more than one investment property over time, your loan structure on the first purchase influences how much capacity you retain for the second and third. Structuring each loan in a way that preserves equity, maximises deductible debt and retains serviceability is central to long-term portfolio growth.

Use separate loan accounts for each property and for each purpose. If you draw equity from your home to fund a deposit, split that loan from your main home loan so the purpose is clear. When you purchase the investment property, keep that loan separate again. That structure allows you to sell one property, refinance another, or adjust repayment strategies without unwinding the entire portfolio. It also protects your interest deductions by ensuring that each loan is tied to a specific purpose.

Offset accounts linked to your investment loan do not reduce the loan balance for the purpose of calculating interest deductions, but they do reduce the interest you pay. That difference is subtle but important. If you hold surplus cash, placing it in an offset account linked to your non-deductible home loan usually delivers a larger after-tax benefit than offsetting against the investment loan. Structure your loans so that deductible debt remains as high as possible and non-deductible debt is paid down first. Refinancing existing loans as you acquire new properties can help realign your structure if your initial setup no longer supports your goals.

Call one of our team or book an appointment at a time that works for you. DC Finance works with Hawthorne residents to structure investment loans that support both immediate purchases and longer-term portfolio growth, with access to investment loan options from banks and lenders across Australia.

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