Providence Lending Group | Investment Loans
5 min read
KEY POINTS
- An investment property loan is assessed differently from your home loan, even though the application process can look similar on the surface.
- Rental income is only partially counted toward serviceability — lenders typically apply a discount, commonly around 80 per cent, to allow for vacancy and costs.
- The same serviceability buffer and debt-to-income settings that apply to your home loan apply here too, and investment lending is often where they bite hardest.
- Interest-only terms are more common on an investment property loan than an owner-occupier one, but they change the total interest paid over the life of the loan.
- This article explains the mechanics only. Whether an investment property loan suits your circumstances depends on individual circumstances and requires professional advice.
For a homeowner considering a second property, it’s tempting to assume an investment property loan works much like the one already sitting on the family home. It won’t be assessed the same way. The application process looks familiar — income, expenses, existing debts, a lender’s assessment of what can be serviced — but underneath that familiar process, several parts of the calculation work differently, and they can materially change what’s actually achievable.
Why an investment property loan isn’t assessed like your home loan
The core serviceability mechanics — the buffered assessment rate, the treatment of living expenses — are the same ones covered in Moneysmart’s guidance on investing in property, which is worth reading alongside this article for the broader risks of property investing beyond the loan itself. What changes with an investment property loan is the income side of the equation: rental income now enters the calculation, and lenders don’t take it at face value.
How rental income is treated in the serviceability test
Most lenders apply a discount to expected or actual rental income before including it in a serviceability assessment — commonly counting around 80 per cent of the figure. This accounts for periods of vacancy, letting fees, maintenance and the general uncertainty of relying on a tenant rather than an employer for part of the income supporting the loan. A borrower who assumes their full rental estimate will offset the new repayment is often surprised to find the servicing gap is larger than expected.
This is compounded by the fact that an existing home loan doesn’t disappear from the calculation just because a new property is being added. Both loans, along with any other debts, are assessed together against household income — which is why an investment property loan often reveals how much borrowing capacity has already been used up by the family home.
An investment property loan is tested against the household’s whole financial position, not against the rental income of the new property in isolation.
Why an investment property loan often eats into your borrowing power more than expected
The same serviceability buffer that applies to a home loan applies here — repayments are assessed at the actual rate plus a margin of at least 3 percentage points. Since February 2026, APRA’s debt-to-income limit has also applied separately to investor lending, restricting the share of new investment loans a lender can write at six times income or more. Investors, who typically carry a higher combined debt load than owner-occupiers, are more likely to be affected by this limit than a borrower purchasing a single home.
Interest-only versus principal and interest
Interest-only terms are more commonly used on an investment property loan than on an owner-occupier one, largely because they free up cash flow in the early years and can suit a strategy built around capital growth rather than immediate equity accumulation. The trade-off is straightforward: less principal is repaid during the interest-only period, more total interest accrues over the life of the loan, and repayments typically increase once the loan reverts to principal and interest. Neither structure is inherently better — the right choice depends on the borrower’s broader strategy and cash flow position.
The considerations that deserve weight
A few points are worth keeping in mind when weighing up an investment property loan against the family home:
- Rental income is generally shaded to around 80 per cent of the figure quoted, not counted in full.
- Existing home loan repayments continue to be assessed in full alongside the new investment property loan.
- Interest-only terms ease cash flow now but increase total interest paid and future repayments once the term reverts.
- The debt-to-income limit applies separately to investment lending, and investors are more likely to be constrained by it than owner-occupiers.
Understanding your position
For a homeowner weighing up a first investment property, the useful exercise is running the numbers as a lender actually would — shaded rental income, buffered repayments, and the existing home loan counted in full — rather than the simpler back-of-envelope version that assumes rent will largely cover the new repayment.
Whether an investment property loan fits your overall financial position, and how it should be structured against your existing home loan, are questions we’re happy to work through with you before you start looking at properties.
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