Avoid These 5 Mistakes When Buying Investment Property

Locking in a Structure You Can't Unwind Later

The loan structure you set at purchase determines your capacity to build on that position later. 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. The issue is that once you've drawn down a loan, the tax deductibility is tied to the original purpose of those funds. If you refinance or redraw for private purposes, you lose deductibility on that portion.

Consider a buyer acquiring a two-bedroom unit near Maroochydore's CBD. They borrow the full amount available, then six months later refinance to release equity for a holiday. The portion used for private purposes is no longer deductible, and that distinction must be tracked for the life of the loan. The cashflow impact compounds over years, and the investor ends up with a blended loan that delivers neither clean tax treatment nor flexibility.

The alternative is to establish an investment loan with a clear separation between investment and private purposes from the start, using offset accounts rather than redraw for any non-investment funds. That keeps the entire loan balance deductible and preserves your ability to release equity later without contaminating the tax treatment. Refinancing becomes a strategic decision rather than a tax repair job.

Choosing Interest-Only Without Matching It to Rental Income

Interest-only repayments reduce your monthly outlay and preserve cashflow, but only if the rental income supports the strategy over the full term. Sunshine Coast vacancy rates fluctuate with seasonal demand, particularly in precincts close to tourism zones like Mooloolaba or Alexandra Headlands. A property that performs well in peak months can sit vacant in the off-season, and if your loan structure assumes continuous income, the gaps hit hard.

An investor borrowing for a unit near Cotton Tree might set a five-year interest-only term expecting rental returns to cover the repayments. If the property sits vacant for eight weeks a year, the investor needs either sufficient offset funds or other income to cover the shortfall. Without that buffer, they're forced to switch to principal and interest repayments earlier than planned, often at a time when rates or personal circumstances have shifted.

Interest-only works when it's paired with a realistic rental income forecast and a cash reserve that can absorb vacancies without forcing a restructure. If the numbers only work at 100 per cent occupancy, the structure is built on optimism rather than cashflow.

Using All Available Equity and Leaving Nothing for Costs You Can't Predict

Banks will lend to a maximum loan-to-value ratio, but borrowing to that limit leaves no room for settlement adjustments, strata levies that increase post-purchase, or urgent repairs that fall outside insurance. Sunshine Coast body corporate fees vary widely depending on the age and facilities of the complex, and special levies for building works are common in older developments near the beachfront.

Lenders Mortgage Insurance is required when the LVR exceeds 80 per cent, and that premium is capitalised into the loan or paid upfront. The premium is a cost borne by the borrower and is calculated on a sliding scale based on the loan amount and LVR. Stamp duty, conveyancing, building and pest inspections, and lender establishment fees all add to the upfront cost, and none of those are deductible in the year of purchase.

An investor who borrows at 90 per cent LVR and uses all available cash for the deposit will often find themselves short when the body corporate issues a special levy three months after settlement. That levy can't be added to the loan without a formal variation, and variations take time. The shortfall either comes from personal savings, which may have been earmarked for other purposes, or it creates a cashflow strain that could have been avoided by holding a buffer at the outset.

Treating the Loan Application as a One-Time Event Instead of a Portfolio Foundation

The way you structure your first investment property loan determines how lenders assess your capacity for the second. APRA activated a DTI lending limit on 27 November 2025, effective from 1 February 2026, applying to all ADIs. Each ADI may lend, measured on a quarterly basis, up to 20 per cent of new investor loans and up to 20 per cent of new owner-occupier loans to borrowers with a total DTI ratio of six times or greater. If your first loan pushes your total debt to the edge of that threshold, your second purchase becomes significantly harder to fund.

Serviceability is assessed on rental income at a discounted rate, typically 80 per cent of the lease amount, and that discount is applied before the loan repayments are tested against the buffered interest rate. APRA requires all ADIs to assess new borrowers' capacity to service a home loan, including a residential investment loan, at an interest rate that is at least 3.0 percentage points above the loan product rate. That buffer applies to every loan on your name, not just the new one. If you're already servicing a loan at the limit of your income, adding a second property requires either higher rent, lower debt, or a co-borrower.

Investors who plan for portfolio growth from the first purchase structure their loans to maintain serviceability headroom. That might mean choosing a lower LVR, selecting a property with stronger rental yield, or splitting the loan across variable and fixed rates to manage repayment predictability without locking in all flexibility.

Ignoring the Tax Changes That Apply to Properties Acquired After May 2026

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. If you're acquiring an established property on the Sunshine Coast now, those losses can no longer be offset against your salary. They carry forward and offset future rental income or capital gains, but the immediate cashflow benefit of negative gearing against wage income is gone.

This doesn't apply to eligible new builds. Eligible new builds include dwellings constructed on previously vacant land and dwellings replacing existing properties where the number of dwellings increases. A townhouse development in Sippy Downs where the dwelling count increases qualifies. A knockdown rebuild in Buderim that replaces one house with one house does not.

The capital gains treatment has also shifted. From 1 July 2027, the 50 per cent CGT discount for individuals, trusts and partnerships on affected assets is replaced by cost base indexation using CPI and a 30 per cent minimum tax rate on real capital gains accruing from that date. For properties acquired before 1 July 2027, the gain is apportioned, with pre-July 2027 gains taxed under the old discount and post-July 2027 gains indexed and taxed at the minimum rate. Investors in new builds can choose the treatment that delivers the lower tax.

If you're structuring a loan for a property that falls under the new tax rules, the assumption that rental losses will offset your income this year is wrong. Your borrowing capacity is unchanged, but your after-tax cashflow position is not. That affects whether the property generates positive cashflow, how much capital you need to hold in reserve, and whether the investment delivers the return you're modelling.

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