Common Mistakes When Choosing Investment Property Types

Investment Loan Amounts Change With Property Category

The property type you choose determines how much you can borrow and on what terms. A lender assessing a two-bedroom apartment in a low-rise complex will calculate a different loan amount than one assessing a four-bedroom house on a separate title, even if both properties sit in the same price range. The difference comes down to rental income projections, vacancy assumptions, and the risk weight the lender applies to that asset class.

Consider a prosthodontist earning around $200,000 who wants to purchase a unit in a high-rise tower with 150 apartments. The lender applies a vacancy rate assumption of 4 to 6 per cent rather than the 2 to 3 per cent used for a detached dwelling. Rental income is discounted more heavily in the serviceability calculation, which reduces the borrowing capacity by $40,000 to $60,000 compared to a house on its own block. That reduction often surprises applicants who assume all residential property is treated identically.

The vacancy rate applied is not always visible in your loan documents. It sits inside the lender's credit policy and serviceability model, but it compounds through the calculation. If you are already using equity release loans from your principal place of residence to fund the deposit, the reduced borrowing capacity can force you to look at lower-priced properties or accept a higher loan-to-value ratio with the associated LMI cost.

Units and Apartments Versus Freestanding Houses

Units and apartments generally attract higher interest rates and lower maximum LVRs than freestanding houses. Most lenders cap investment loans on apartments at 90 per cent LVR, and some reduce that further if the unit is in a high-density building or if the postcode has above-average supply. A freestanding house on a separate title is typically lent to 95 per cent LVR with LMI, provided all other criteria are met.

Body corporate fees and sinking fund levies are included in the serviceability assessment for units but do not apply to freestanding houses. A unit with quarterly levies of $1,200 reduces your borrowing capacity by roughly $80,000 to $100,000, depending on the lender's servicing buffer and your debt-to-income ratio. That is a permanent reduction for as long as you hold that asset, not a one-off cost.

Some prosthodontists prefer units because the maintenance responsibility is lower and the property is managed collectively. That is a valid strategy if you want passive income without the obligation to coordinate tradespeople and manage repairs directly. The cost is a lower loan amount and a higher rate, which you need to price into the total return before committing.

Townhouses and Terraces Sit Between the Two

Townhouses and terraces occupy a middle position. They are usually on strata title, so body corporate fees apply, but the building footprint is smaller and the density is lower than a multi-storey apartment block. Lenders generally treat them more favourably than units but less favourably than detached houses. Maximum LVR is typically 90 per cent, and vacancy rate assumptions fall between those used for apartments and houses.

In a scenario where a prosthodontist is comparing a terrace in an established suburb with a unit in a newer complex, the terrace often delivers a higher loan amount and a slightly lower rate. The difference might be 0.10 to 0.15 per cent on the variable rate and an additional $30,000 to $50,000 in borrowing capacity. That difference can determine whether you need to include LMI or whether you can structure the loan as interest-only without breaching the lender's DTI limits.

The rental yield on a terrace is usually lower than a unit in percentage terms, but the capital appreciation tends to track closer to detached housing. If your property investment strategy prioritises portfolio growth and building wealth over immediate cash flow, the terrace often aligns more closely with that objective.

New Builds Versus Established Properties and the Tax Position From 2027

Acquiring a newly constructed dwelling provides access to depreciation deductions on the building and plant and equipment that are not available on established properties purchased after May 2017. From the 2027-28 income year, investors who purchase eligible new builds after 12 May 2026 also retain full negative gearing and a choice between the existing 50 per cent CGT discount or the new indexed cost base with a 30 per cent minimum rate. Properties classified as established and purchased after that date are subject to the new quarantining rules, where losses are deductible only against other residential property income.

For a prosthodontist with a taxable income above $180,000, the ability to offset a loss of $15,000 to $20,000 per year against your salary rather than quarantine it for future use delivers an immediate cash flow benefit. That difference is worth modelling before you decide whether to pursue a house and land package or an established dwelling in a suburb with stronger rental demand and lower vacancy risk.

The definition of an eligible new build includes dwellings constructed on vacant land and properties where the number of dwellings on the site has increased. A knock-down rebuild that does not add dwellings is not eligible. If a new build is occupied by the original owner for more than 12 months before being sold, the subsequent purchaser loses access to the full negative gearing treatment. This is a detail that matters when assessing off-the-plan purchases or turnkey builds marketed to investors.

Dual Occupancy, Granny Flats, and Properties With Secondary Dwellings

Properties with a secondary dwelling on the same title deliver two rental income streams but are treated as a single security by the lender. The combined rental income is included in the serviceability calculation, which can increase your borrowing capacity compared to a single dwelling on the same-sized block. The difficulty is that not all lenders will include the second income stream at full value, particularly if the secondary dwelling is unregistered or does not have a separate electricity meter.

A dual occupancy property where both dwellings are rented increases the assessed rental income but also increases the lender's vacancy assumption. Some lenders model a combined vacancy rate of 4 to 5 per cent rather than the 2 to 3 per cent used for a single dwelling, which partially offsets the additional income. The borrowing capacity typically increases by $60,000 to $100,000 compared to a single dwelling with equivalent land value, but that increase is not automatic and depends on the lender's credit policy.

If you are considering a property with a secondary dwelling, confirm before contracting that your intended lender will recognise both income streams. A valuation that identifies the second dwelling as unauthorised or non-compliant can cause the lender to exclude that income entirely, which changes the loan amount and may prevent settlement if your borrowing capacity falls below the contract price.

Commercial Property Mixed With Residential and Loan Structure

A property with both residential and commercial components, such as a shop with an apartment above, is often classified as commercial security. Commercial investment loans are structured differently from residential loans, with shorter interest-only periods, lower maximum LVRs, and no access to residential LMI products. Loan terms are typically capped at 15 to 20 years rather than 30 years, and the interest rate is higher.

Some lenders will treat the property as residential if the commercial component is less than 50 per cent of the total floor area and is not separately titled. That classification allows you to access investment loan options with longer terms and lower rates, but it is not universally applied. If you are a prosthodontist considering a mixed-use property, obtain written confirmation from the lender that the loan will be classified as residential before exchanging contracts.

Mixed-use properties also attract different depreciation schedules and may require a quantity surveyor's report that separates the residential and commercial components for tax purposes. Body corporate fees are often higher, and insurance costs increase due to the commercial use. The additional rental income from the commercial tenancy can justify these costs, but the loan structure and holding costs need to be modelled together rather than assessed in isolation.

Rural and Regional Properties and Postcode Restrictions

Lenders apply postcode restrictions to rural and regional properties based on population size, economic diversity, and recent sales volumes. A property in a regional centre with a population above 50,000 is generally treated as standard residential security. A property in a town with a population below 10,000 or in a postcode flagged as high-supply or mining-dependent may attract a lower maximum LVR, a higher interest rate, or be declined entirely.

Some lenders cap investment loans on rural properties at 70 per cent LVR regardless of the applicant's income or deposit size. Others will lend to 80 per cent but require a postcode-by-postcode assessment. If you are considering a regional investment property, check the lender's geographic restrictions before obtaining a valuation or signing a contract. A property that falls outside the lender's postcode list cannot be refinanced to a different lender without accepting the same restrictions, which reduces your flexibility if you need to restructure the loan or access equity later.

Rental yields in regional areas are often higher than metropolitan averages, which can offset the lower capital growth. A rental yield of 6 to 7 per cent reduces the cash flow gap between rental income and loan repayments, which can be attractive if you are managing multiple properties and want to minimise the need to top up repayments from your income. The offset is a smaller pool of potential tenants, longer vacancy periods, and reduced access to lenders if you need to refinance the investment loan in future.

Interest-Only Loans and Property Type Restrictions

Most lenders offer interest-only periods of up to five years on residential investment loans, but some property types are excluded. Apartments in buildings with more than 50 per cent non-owner-occupied units, properties in postcodes flagged as oversupplied, and properties with a purchase price below a certain threshold are often restricted to principal-and-interest repayments from the outset.

An interest-only loan reduces the monthly repayment by 30 to 40 per cent compared to a principal-and-interest loan at the same rate and term. That reduction improves cash flow and can increase the number of properties you can hold within your DTI limit. From 1 February 2026, lenders apply a separate 20 per cent cap on new investor loans to borrowers with a DTI ratio of six times or greater, measured quarterly. If you are purchasing a property type that is ineligible for interest-only, the higher repayment reduces your borrowing capacity and may push you over the DTI threshold, which limits your access to additional lending.

Interest-only periods are not automatically renewed at the end of the initial term. You need to reapply and meet the lender's serviceability criteria at that time. If your income has not increased or if you have acquired additional debt, the lender may require you to convert to principal-and-interest repayments, which increases your monthly cost by several thousand dollars depending on the loan amount.

Call one of our team or book an appointment at a time that works for you. We work with prosthodontists across Australia and can walk you through the loan structure and property type combinations that align with your income, deposit position, and investment objectives.

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