Top Strategies to Structure Your First Investment Loan

Your borrowing capacity for an investment property is calculated differently to an owner-occupied home loan.

When you apply for an investment loan, lenders add a serviceability buffer and discount the rental income you expect to receive. That adjustment changes how much you can borrow, which deposit you need, and whether the property will support itself from day one. Understanding those differences before you search for a property gives you a realistic price range and prevents wasted weekends inspecting homes you cannot finance.

How Lenders Calculate Your Borrowing Capacity for Investment

Lenders assess your ability to service an investment loan by adding a buffer of three percentage points to the product rate and including only a portion of the expected rental income. Most lenders apply 80 per cent of the anticipated rent when calculating serviceability, which means you cannot rely on the full rental amount to cover the loan repayment. If a property in East Toowoomba is expected to rent for $500 per week, the lender will count $400 per week in the assessment. The remaining $100 is treated as a buffer for vacancy periods and maintenance. That discounted income is then weighed against your existing commitments, including credit cards, personal loans and your current mortgage if you have one. The serviceability buffer is applied to protect against rate rises, so even if the variable rate is 6.0 per cent, the lender will test your ability to repay at 9.0 per cent.

Consider a buyer earning $95,000 per year with no other debt who wants to purchase a two-bedroom unit near the University of Southern Queensland. The property is expected to rent for $480 per week. The lender will assess serviceability using $384 per week in rental income and apply the buffer to the loan rate. If the buyer has a 20 per cent deposit and applies for a loan amount of $400,000, the lender will calculate repayments at the buffered rate and determine whether the buyer's salary plus discounted rent can service that amount. In this scenario, the buyer may find their borrowing capacity is lower than expected because rental income alone does not cover the gap.

Deposit Requirements and Lenders Mortgage Insurance

Most lenders require a minimum 10 per cent deposit for an investment property, but borrowing above 80 per cent loan to value ratio triggers Lenders Mortgage Insurance. LMI protects the lender if you default, and the premium is added to your loan amount or paid upfront. The cost of LMI increases as your deposit decreases. A 10 per cent deposit on a $450,000 property means an LVR of roughly 90 per cent, and the LMI premium could be several thousand dollars. A 20 per cent deposit avoids LMI entirely and also improves your interest rate, because lenders offer better pricing at lower LVRs.

Genuine savings are also assessed. Lenders want to see that your deposit has been held in your account for at least three months and was not borrowed from another source. Gifts from family members are accepted by some lenders, but the funds usually need to be declared and may require a statutory declaration. If you are using equity from your existing home, the lender will require a valuation and will calculate the available equity based on 80 per cent of that value, minus your current loan balance. Equity release can be used as a deposit for the investment property, but it increases the debt against your home and affects serviceability for the new loan.

Interest Only Repayments Versus Principal and Interest

Investment loans can be structured as interest only or principal and interest. An interest only loan requires you to pay only the interest portion each month, which lowers the repayment and can improve cash flow if the property does not generate enough rent to cover a principal and interest repayment. Interest only periods are typically offered for one to five years, after which the loan reverts to principal and interest unless you request an extension. The benefit is a lower monthly commitment during the interest only period, which can be useful if you are building equity in other properties or prioritising repayments on your owner-occupied home.

Principal and interest repayments reduce the loan balance over time and build equity in the investment property. The repayment is higher, but you pay less interest over the life of the loan. Some investors prefer principal and interest from the start because it forces discipline and reduces debt. Others use interest only to maximise tax deductions, because interest on an investment loan is a claimable expense, whereas principal repayments are not. The structure you choose depends on your cash flow, your tax position and whether you plan to hold the property long term or sell within a few years.

Variable Rate or Fixed Rate for Investment Property

Variable rate investment loans allow you to make extra repayments without penalty and give you access to offset accounts, which can reduce the interest you pay by parking surplus cash against the loan balance. Variable rates move with the market, so your repayment can increase or decrease depending on the Reserve Bank's decisions. Fixed rate investment loans lock in a rate for a set period, usually one to five years, which provides certainty but restricts flexibility. Most fixed rate products do not allow extra repayments beyond a small annual cap, and breaking a fixed rate before the term ends can result in significant break costs.

Some investors split their loan between variable and fixed to balance certainty and flexibility. A common approach is to fix 50 per cent of the loan amount and leave the remainder on a variable rate with an offset account. That structure provides some protection against rate rises while preserving the ability to make additional repayments and access redraw if needed. The split does not need to be equal, and the proportion you fix should reflect your risk tolerance and how much flexibility you need.

Tax Deductions and Negative Gearing

Interest on an investment loan is tax deductible, as are other costs associated with holding the property, including body corporate fees, council rates, insurance, property management fees, repairs and depreciation on fixtures and fittings. If your claimable expenses exceed the rental income, the property is negatively geared, and the loss can be offset against your other income to reduce your taxable income. That offset reduces the amount of tax you pay and improves the after-tax return on the investment.

From 1 July 2027, properties purchased after 7:30pm AEST on 12 May 2026 will be subject to new negative gearing rules unless they qualify as eligible new builds. Net rental losses on those properties can only be offset against other residential rental income or carried forward, not against salary or wages. Properties held before that date, including those under contract at the cut-off time, continue under the existing rules. If you are considering an established property in East Toowoomba, the timing of your purchase affects whether you can negatively gear against your salary. Eligible new builds, defined as dwellings constructed on previously vacant land or properties where the number of dwellings increases, retain access to full negative gearing.

Choosing the Right Investment Loan Product

Investment loan products vary in features, pricing and flexibility. Some lenders offer professional packages with discounted rates and fee waivers for borrowers with higher incomes or larger loan amounts. Others provide investor-specific products with features such as capitalised interest, which allows you to add the interest to the loan balance during the construction phase of a new build. Access to a wide range of investment loan options from banks and lenders across Australia allows you to compare rates, offset availability, and prepayment flexibility.

East Toowoomba's proximity to the university and the Toowoomba Base Hospital makes it a popular choice for investors targeting students and hospital staff. Properties in the suburb tend to have lower vacancy rates compared to outer areas, which improves rental yield and serviceability. When structuring your investment loan application, choose a property type and location that aligns with the lender's risk appetite. Lenders prefer properties in areas with strong rental demand and low vacancy rates, and some will apply a discount to rental income in postcodes they consider higher risk. Working with a broker who understands the local market and lender policies can improve your chances of approval and secure a more competitive rate.

Refinancing an Investment Loan

Refinancing an investment property loan can reduce your interest rate, release equity for further purchases, or consolidate debt. Lenders assess refinance applications using the same serviceability criteria as new loans, including the rental income discount and the three percentage point buffer. If your property has increased in value since purchase, refinancing at a lower LVR may give you access to a lower rate and remove LMI if it was originally paid. Equity released through refinancing can be used as a deposit for a second investment property, but the additional borrowing increases your total debt and affects serviceability for future loans.

Refinancing also allows you to restructure your loan from interest only to principal and interest, or vice versa, depending on your current strategy. If your income has increased or your other debts have been repaid, refinancing may increase your borrowing capacity and allow you to access additional funds for renovations or portfolio growth. Switching lenders can also provide access to features not available on your current loan, such as an offset account or the ability to split the loan between variable and fixed rates.

Call one of our team or book an appointment at a time that works for you to discuss your investment loan options and structure a solution that supports your property investment strategy.

Frequently Asked Questions