Everything You Need to Know About Investment Loans

Understanding Investment Loans and How They Work

An investment loan is structured differently from a home loan because it finances a property you won't live in. Lenders assess your application based on the rental income the property will generate, not just your salary, and they apply different serviceability rules to investor borrowing compared to owner-occupier finance.

The loan amount you can access depends on the property's expected rental income, your existing commitments, and the loan to value ratio you're aiming for. Most lenders will lend up to 80 per cent of the property value without requiring Lenders Mortgage Insurance, though some will go higher if you're willing to cover the additional premium. The assessment buffer sits at 3 percentage points above the product rate, so if you're looking at a variable rate of 6.5 per cent, the lender will test your ability to service the loan at 9.5 per cent.

Consider an Adelaide investor purchasing a two-bedroom unit in Prospect. Rental appraisal suggests $480 per week, which gives the lender $24,960 in annual income to factor into serviceability. If the investor is also carrying a home loan and a car loan, the lender will subtract those commitments and apply the buffer before arriving at the approved loan amount. In this scenario, even though the rental income supports the investment, existing debt reduced the maximum borrowing capacity by around 15 per cent compared to what the investor initially expected.

Investment Loan Features That Suit Different Strategies

Interest only repayments remain a common feature for investment property finance because they lower the monthly outgoing and allow investors to redirect capital toward portfolio growth or other investments. An interest only period typically runs for one to five years, after which the loan converts to principal and interest unless you renegotiate.

Fixed rate options lock in your interest rate for a set term, usually between one and five years, which can help with budgeting if you're managing multiple properties or planning around specific tax outcomes. Variable rate products offer more flexibility, including offset accounts and the ability to make extra repayments without penalty, which matters if you want to reduce debt or access redraw when another opportunity appears.

Some lenders offer packages that combine both structures, allowing you to fix a portion of the loan amount while keeping the remainder on a variable rate. This approach suits investors who want rate certainty on part of their debt but don't want to lose access to features like offset or redraw.

Tax Changes You Need to Account for Before Buying

From 1 July 2027, negative gearing rules will change for residential investment properties purchased after 7:30pm AEST on 12 May 2026. If you buy an established dwelling after that date, any net rental loss can only be offset against other residential rental income or carried forward. You can't offset those losses against your salary or other income as you can under current rules.

Properties you already own, or those you had under contract before the cut-off time, are grandfathered under the existing negative gearing framework. For properties purchased between the announcement and 30 June 2027, you can claim losses against other income until 30 June 2027 only, after which the new quarantine rules apply.

The change doesn't affect new builds that meet the eligibility criteria. If you're buying a dwelling constructed on previously vacant land, or a development that increases the number of dwellings on a site, you can continue to negatively gear under existing rules. A knock-down rebuild that doesn't increase dwelling numbers doesn't qualify, and if a new build is occupied for more than 12 months before you purchase it, the exemption no longer applies to you as the subsequent investor.

Capital gains tax treatment is also shifting from 1 July 2027. The 50 per cent discount for individuals and trusts is being replaced with cost base indexation and a minimum 30 per cent tax rate on real gains for affected assets. Gains that accrued before 1 July 2027 remain under current rules, so only the gain that builds after that date is subject to the new treatment. Eligible new build residential properties have an election between the discount method and indexation, which gives you some planning flexibility depending on your holding period and inflation.

Loan to Value Ratio and Deposit Requirements

Most Adelaide investors aim for an 80 per cent loan to value ratio to avoid paying Lenders Mortgage Insurance, which means a 20 per cent deposit plus costs. If you're buying a unit in Mawson Lakes or a house in Salisbury Downs, stamp duty and settlement costs will add several thousand dollars to the upfront amount you need, so it's worth calculating the total before you commit to a purchase price range.

If you already own property, you may be able to leverage equity rather than saving a cash deposit. Equity release works by refinancing your existing loan or taking out a second facility secured against the property you already own. Lenders will assess the combined loan to value ratio across both properties, and they'll still apply the serviceability buffer to all your loans together.

In our experience, investors who use equity to fund their deposit sometimes underestimate the impact on serviceability. A buyer with $150,000 in available equity might find that releasing $100,000 reduces their borrowing capacity for the new investment loan because the additional debt on the first property increases total repayments. Running the numbers with a broker before you make an offer avoids disappointment later.

Interest Only vs Principal and Interest for Investment Property

Interest only suits investors focused on cash flow or portfolio expansion. Monthly repayments are lower because you're not reducing the loan balance, which frees up capital for other investments or a second deposit. The downside is that you're not building equity through repayments, so your wealth accumulation relies entirely on capital growth and rental income.

Principal and interest repayments reduce the loan balance over time, which builds equity and lowers your total interest cost across the life of the loan. This structure works well if your priority is to own the property outright within a set timeframe, or if you're approaching retirement and want to reduce debt.

Some investors start with interest only and switch to principal and interest once rental income increases or other financial commitments drop away. There's no single right answer, the choice depends on your investment property strategy, cash flow needs, and how long you plan to hold the asset.

Investment Loan Application and What Lenders Assess

Lenders want to see rental income that covers or comes close to covering the loan repayments, a deposit or equity position that meets their loan to value ratio requirements, and a serviceability margin that accommodates the 3 percentage point buffer. They'll also consider vacancy rates, which in Adelaide's inner and middle ring suburbs typically sit between 0.5 per cent and 1.5 per cent depending on the area and property type.

Your investment loan application will require rental appraisals from a licensed property manager, evidence of your deposit or equity, and full disclosure of existing debts and commitments. If you're claiming rental income from a property you already own, lenders will ask for a lease agreement and recent rental statements. Body corporate fees, council rates, and landlord insurance are treated as ongoing costs and will reduce the net rental income figure the lender uses in their assessment.

Debt-to-income caps came into effect in February, limiting the proportion of new investor loans that ADIs can write at 6 times income or greater to 20 per cent of their investor portfolio. This doesn't mean you can't borrow above 6 times your income, but it does mean some lenders will prioritise applicants with lower ratios or charge higher rates for loans that push them toward their cap.

Refinancing Investment Loans and When It Makes Sense

Refinancing an investment loan can improve your interest rate, release equity for another purchase, or shift your loan structure to match a change in strategy. If you took out your loan more than two years ago and haven't reviewed it since, there's a reasonable chance you're no longer on a competitive rate.

Rate discounts vary by lender, loan amount, and loan to value ratio. Investors with larger loan amounts and lower LVRs generally secure deeper discounts, while those borrowing at 85 or 90 per cent LVR may find their options more limited. A refinance also gives you the opportunity to consolidate debt, switch from interest only to principal and interest, or move from a fixed rate product that's about to expire onto a variable rate with offset.

Refinancing does come with costs, including discharge fees on your existing loan, application fees on the new loan, and valuation fees. In most cases, these are outweighed by the interest savings or strategic benefit, but it's worth running the numbers rather than assuming a refinance will always improve your position.

Maximising Tax Deductions and Claimable Expenses

Interest on your investment loan is fully deductible, as are property management fees, council rates, water charges, landlord insurance, repairs, and depreciation on the building and fixtures. Body corporate fees for units and townhouses are also claimable, as are costs associated with finding a tenant, such as advertising and lease preparation.

To maximise tax deductions, keep detailed records of every expense and ensure your loan is structured correctly. If you've borrowed for both investment and private purposes using the same facility, only the portion used for investment is deductible. Splitting your loans at the outset, or refinancing to separate them, keeps the deduction clear and avoids issues if the ATO ever reviews your return.

Negative gearing benefits under current rules allow you to offset a rental loss against your other income, which reduces your taxable income and may result in a refund. From 1 July 2027, this only applies to grandfathered properties or eligible new builds, so understanding which rules apply to your property is important for accurate tax planning.

Portfolio Growth and Building Long-Term Wealth

Building wealth through property investment usually involves holding assets long enough for capital growth to compound and rental income to increase. Adelaide's median house price has grown steadily over the past decade, supported by relative affordability compared to Sydney and Melbourne, and demand from interstate buyers and migrants settling in South Australia.

Investors building a portfolio often use equity from one property to fund the deposit on the next, repeating the process as each asset grows in value and rental income improves. This approach requires careful management of serviceability, because each additional loan increases your total debt and reduces the amount lenders will approve for the next purchase. Regular loan health checks help you monitor your position and make adjustments before serviceability becomes a constraint.

Passive income from investment properties can support financial freedom over time, particularly if you structure your portfolio to be cash flow neutral or positive. Rental income that meets or exceeds your loan repayments and property costs means the portfolio funds itself, allowing you to focus on capital growth and eventual debt reduction without ongoing cash injections.

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