I get a version of this question constantly from clients who already own their home and are looking at their first investment property. They assume the loan works basically the same way as the one they already have, and then they’re surprised when the numbers, the paperwork, and even the interest rate look different. So let’s go through exactly how an investment property loan differs from an owner occupier loan, why those differences exist, and what they actually mean for you as a borrower.
An owner occupier loan is for a property you intend to live in as your home. An investment property loan is for a property you intend to rent out to earn income, whether that’s a long term tenant or a short term arrangement. On paper, the two loans can look almost identical, same lender, same loan term, same repayment structure options. But underneath, the purpose you declare on your application changes how the lender prices the loan, how much they’ll lend you, and how they assess your ability to repay it.
This isn’t just a technicality either. Lenders are required to classify and report investor lending separately from owner occupier lending as part of the broader prudential framework set by the Australian Prudential Regulation Authority (APRA), which oversees how banks manage lending risk across the system. That classification flows all the way down to the rate and terms you’re offered.
This is usually the first thing clients notice, and it catches a lot of people off guard. Investment property loans typically carry a higher interest rate than owner occupier loans, even when everything else about the loan looks the same, same lender, same deposit size, same loan amount.
The gap usually sits somewhere between 0.2 and 0.6 percentage points above the equivalent owner occupier rate, though it varies by lender and by product. It doesn’t sound like much until you run the numbers. On a $700,000 investment loan, even a 0.5 percentage point difference works out to roughly $3,500 a year in extra interest, and over a decade that adds up to tens of thousands of dollars.
Lenders price it this way because, from their perspective, an investment property carries more risk than a home you live in. If someone falls on hard times financially, they’ll generally do everything they can to keep paying the mortgage on the home they actually live in before protecting a rental property. An investor also has to juggle their own mortgage, the investment loan repayments, and the reliability of rental income, which can be interrupted by a vacancy or a tenant who stops paying. On top of that, APRA has historically imposed additional capital and lending requirements specifically on investment lending during periods when investor activity was pushing property prices up quickly, which reinforces the pricing gap across the whole market.
This is the part that surprises people the most, because it’s not just about the interest rate. Every lender is required to apply a serviceability buffer, currently set at 3 percentage points above your actual loan rate, when assessing whether you can afford the loan. This buffer applies to owner occupier and investment loans alike, but because investment rates start higher, the assessment rate ends up higher too. If your investment rate is 6.5 percent, for example, the lender might actually be testing your ability to service the loan at 9.5 percent.
On top of that, lenders don’t count your expected rental income at full value. Most lenders will only recognise somewhere around 70 to 80 percent of your anticipated rental income in their calculations, a practice often called rental income shading. This accounts for the possibility of vacancy periods, rent reductions, and management costs eating into what actually lands in your pocket. Combine a higher assessment rate with shaded rental income, and it becomes clear why an investment purchase can leave you with noticeably less borrowing power than an owner-occupier purchase of the same value, even with identical income and existing debts.
Your existing debts matter more here too. Lenders look at the limits on your credit cards, not just the balances, and they factor in your existing home loan repayments at the buffered rate as well. If you’re planning to build a portfolio of more than one investment property, this compounding effect on serviceability is exactly where a lot of would-be investors hit a wall with mainstream bank lending, and it’s often where a broker becomes genuinely useful in finding a lender whose policies suit your specific situation.
Deposit requirements work similarly to owner occupier loans in principle, most lenders like to see around 20 percent, and Lenders Mortgage Insurance (LMI) generally applies if you’re borrowing above 80 percent of the property’s value regardless of whether it’s owner occupied or an investment. It is possible to buy an investment property with a smaller deposit, sometimes as low as 10 percent, though your options narrow considerably below that, and the LMI premium on an investment loan can sometimes carry a modest loading compared to the equivalent owner occupier premium at the same loan to value ratio.
Owner occupiers are almost always better off on principal and interest repayments, since every repayment builds equity in the home you live in and reduces the total interest you pay over the life of the loan. For investors, the calculation is more nuanced.
A lot of property investors, particularly in the early years of building a portfolio, choose interest only repayments. This keeps monthly repayments lower, which frees up cash flow that can go toward saving a deposit for the next property, covering holding costs, or simply managing risk while the portfolio grows. The loan balance doesn’t reduce during the interest only period, so you’re not building equity through repayments, but the interest is still generally tax deductible against your rental income either way. It’s worth noting that lenders do have limits on how much interest only lending they’ll approve across their overall loan book due to APRA requirements, so approval for an interest only structure isn’t automatic and depends on your broader financial position.
This is where investment property loans genuinely diverge from owner occupier loans in a way that goes beyond the loan itself. Interest on an owner occupier loan isn’t tax deductible, because you’re not earning income from the property. Interest on an investment loan generally is deductible, along with other costs like property management fees, council rates, and depreciation, because the property is being used to produce rental income. According to the Australian Taxation Office, a property is negatively geared when your deductible expenses exceed the rental income it produces, and that net loss can generally be offset against your other income, such as salary or wages, when you lodge your tax return.
This is worth understanding properly before you buy, because it genuinely changes the after tax cost of an investment loan compared to what the headline interest rate suggests. It’s also worth knowing that the rules around negative gearing have recently changed. Following the 2026 to 27 Federal Budget, the ATO confirms that negative gearing will be limited to new build residential properties from 1 July 2027 onward. Properties already held, or under contract, at the time of the announcement on 12 May 2026 are unaffected and can continue to be negatively geared as before. If you’re buying an established property after that date, it’s worth speaking with your accountant about how the new rules apply to your specific purchase and timing, since this is a genuinely significant change to how investment property has traditionally been taxed in Australia. This is general information rather than tax advice, and your own circumstances should always be confirmed with a qualified accountant before you make a decision based on it.
Beyond interest only versus principal and interest, there are a few structural decisions that matter more for investment loans than they typically do for an owner occupied purchase.
Cross collateralisation. This is where a lender uses equity in your existing property as security for a new investment loan, effectively linking both properties together under the one arrangement. It can make borrowing easier in the short term, but it also means both properties are tied to each other, which can complicate things later if you want to sell one or refinance separately. In most cases, keeping loans and securities separate gives you more flexibility down the track, even if it takes a little more structuring upfront.
Loan splitting. Some investors choose to split an investment loan between fixed and variable portions, to manage interest rate risk while still keeping some flexibility to make extra repayments or use an offset account on the variable portion.
Which lender fits your strategy. Not every lender treats rental income, existing debt, or interest only requests the same way. If you’re planning to buy one investment property, a mainstream bank might be perfectly fine. If you’re planning to build a portfolio over several years, the lender’s specific policies on serviceability and interest only lending can make a real difference to how far you can go, which is exactly the kind of comparison I run for clients before they commit to a lender for their first investment purchase.
FAQs
In most cases, yes, if you're moving out of your current home and renting it out rather than selling it. You'll usually need to notify your lender of the change in purpose, since this can affect your interest rate and how the loan is assessed going forward, even if you don't take out a new loan altogether.
Not necessarily, the standard deposit guidance of around 20 percent applies to both, though some lenders are more conservative with investment lending and may prefer a larger deposit or apply tighter loan to value ratio caps, particularly if you already hold other investment properties.
No, it depends on your strategy and timeline. Interest only can help cash flow and free up funds for further investment, but you're not paying down the loan balance during that period, and lenders won't always approve it depending on your overall financial position and their internal policy limits.
Lenders typically only recognise around 70 to 80 percent of your expected rental income when assessing serviceability, which reduces how much they'll consider you able to afford compared to using the full rental figure. This is one of the main reasons borrowing power for an investment purchase can look lower than people initially expect.
Generally, interest on funds borrowed to refinance an investment loan remains deductible, provided the purpose of the loan continues to be income producing. It's worth confirming the specifics with your accountant, particularly if you're increasing the loan amount or changing how the funds are used.
Not automatically. Different lenders have different appetites and policies for investment lending, and the lender that gave you the sharpest rate on your home loan isn't always the best fit for an investment purchase. Comparing properly across your options is usually worth the extra step.
If you’re weighing up your first investment property, or thinking about how a purchase would affect your existing home loan, that’s exactly the sort of scenario I sit down and map out with clients before they commit to anything. Take a look at our Investment Property Loans page for more detail, and if refinancing your current loan is part of the plan, our Home Loan Refinancing page covers that in full.
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