Buying an established investment property in Perth or Mandurah means you're dealing with known rental yields, actual vacancy rates, and a settled property that won't require months of waiting before tenants move in.
The loan structure you choose affects how much rental income you keep, what you can claim at tax time, and how quickly you can grow your portfolio. Most property investors start with an established property because the numbers are easier to verify upfront. You can see what similar properties rent for, what body corporate fees run at if you're buying a unit, and whether the suburb attracts long-term tenants or frequent turnover.
How Investment Loan Amounts Are Calculated for Established Properties
Lenders assess your borrowing capacity by combining your income with expected rental income, then applying a serviceability buffer to ensure you can still make repayments if rates rise or the property sits vacant. Rental income is typically assessed at 80% of its market value to account for vacancy periods and maintenance costs.
Consider a buyer purchasing a unit in Halls Head for $450,000 with a rental appraisal of $480 per week. The lender treats that as $384 per week of assessable income. With a 20% deposit, the loan amount sits at $360,000. If this buyer earns $85,000 annually and has no other debts, serviceability usually passes without issue. But if they're carrying $25,000 in personal loan debt, that changes the calculation significantly. Lenders often suggest clearing smaller debts before applying, which can increase your investor borrowing power by $80,000 or more depending on repayment amounts.
Your loan to value ratio (LVR) also affects what you pay. Borrowing above 80% LVR typically requires Lenders Mortgage Insurance (LMI), which can add $10,000 to $20,000 to your loan amount on a $400,000 purchase. Structuring your deposit to avoid LMI or factoring it into your investment property finance plan matters more than most buyers realise when they first start looking at properties.
Interest Only vs Principal and Interest for Rental Properties
Interest only loans keep repayments lower during the investment period, which maximises tax deductions and improves cash flow. Principal and interest loans reduce your debt over time but increase your monthly outgoings.
Most property investors in Perth opt for interest only repayments on their rental property loan because the tax treatment favours it. If you're paying $2,400 per month on a principal and interest loan, only a portion of that is tax-deductible. On an interest only structure, the full repayment amount is claimable as an expense against rental income. That usually means an extra $200 to $400 per month in your pocket after tax, depending on your marginal rate.
Interest only periods typically last five years, after which the loan reverts to principal and interest unless you refinance. Many investors refinance their investment loan before that reversion happens to lock in another interest only period and maintain cash flow. Some lenders allow up to 15 years of interest only across multiple terms, which suits investors focused on portfolio growth rather than debt reduction.
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Variable Rate or Fixed Rate for Investment Property Loans
Variable interest rates move with the market and allow full access to offset accounts and extra repayments without penalty. Fixed interest rates lock in your repayment amount for one to five years but restrict flexibility.
In suburbs like Mandurah, where vacancy rates sit low and rental demand stays consistent, investors often choose variable rates to take advantage of offset accounts. An offset account linked to your investment loan reduces the interest charged without affecting your ability to claim the full loan interest as a tax deduction. If you're holding $30,000 in savings, that money sitting in an offset account saves you interest on $30,000 of your loan balance while remaining accessible if you need it.
Fixed rates appeal to investors buying in areas with tighter cash flow or those who want certainty around repayments. A fixed rate at current levels might suit someone purchasing a property in Greenfields where rental yields are solid but vacancy periods can stretch slightly longer than in more established areas like Halls Head or Falcon. Locking in repayments for three years removes the risk of rate rises eating into your passive income during that period.
Some lenders offer split loan structures where you fix part of your loan amount and leave the rest on a variable rate. This approach balances certainty with flexibility, though it does add complexity when calculating investment loan repayments and managing multiple loan accounts.
Maximising Tax Deductions on an Established Investment Property
All interest charged on your investment property loan is tax-deductible, along with body corporate fees, council rates, property management fees, repairs, and depreciation on fixtures and fittings. Stamp duty and conveyancing costs are not claimable in the year you purchase, but they form part of your cost base when you eventually sell.
Depreciation on an established property still delivers value, though not at the same rate as a new build. A quantity surveyor's report typically costs around $600 and identifies claimable depreciation on things like carpet, blinds, hot water systems, and appliances. On an older unit in Mandurah, you might claim $3,000 to $5,000 annually in depreciation, which reduces your taxable income without any actual cash leaving your account.
Negative gearing benefits apply when your claimable expenses exceed your rental income. If your property generates $24,000 in rent annually but costs $30,000 in loan interest, body corporate, rates, and other expenses, that $6,000 loss reduces your taxable income. At a marginal tax rate of 37%, that's $2,220 back in your pocket at tax time. Negative gearing works well for investors with strong personal income who want to build wealth through property while reducing their tax liability each year.
Accessing Investment Loan Options Across Multiple Lenders
Different lenders assess rental income differently, offer varying interest rate discounts, and have distinct policies around LVR limits and offset account features. Working with a mortgage broker gives you access to investment loan options from banks and lenders across Australia, not just the ones you'd approach directly.
Some lenders cap interest only periods at five years. Others allow ten or fifteen. Some accept 90% LVR for investment loans, while others stop at 80% unless you're refinancing. One lender might assess rental income at 80%, another at 75%. Those differences shift your serviceability by tens of thousands of dollars, which can determine whether you can purchase a $400,000 property or need to look at something closer to $350,000.
Investment loans also vary in how they handle rate discounts. A lender advertising a strong headline rate might offer that only on owner-occupied loans, with investment property rates sitting 0.40% to 0.60% higher. Another lender might have a higher advertised rate but smaller gaps between owner-occupied and investor interest rates, making them more suitable depending on your situation.
Down to Earth Mortgage Broking works with property investors across Mandurah and Perth to structure loans that fit your property investment strategy, whether you're buying your first rental or adding to an existing portfolio. We handle the application, compare lenders based on features that matter for your situation, and make sure the loan structure supports your long-term goals.
If you're ready to move forward or want to talk through your options before you start looking at properties, call one of our team or book an appointment at a time that works for you.
Frequently Asked Questions
How much deposit do I need to buy an investment property in Perth?
Most lenders require a 20% deposit to avoid Lenders Mortgage Insurance (LMI), though you can borrow up to 90% LVR if you're willing to pay LMI. A 20% deposit on a $450,000 property means you need $90,000 plus stamp duty and other purchase costs.
Should I choose interest only or principal and interest for an investment loan?
Interest only repayments keep your monthly costs lower and maximise tax deductions, which suits most property investors focused on cash flow and portfolio growth. Principal and interest loans reduce your debt over time but increase monthly outgoings and reduce the tax-deductible portion of your repayment.
Can I claim all my investment property expenses at tax time?
You can claim loan interest, property management fees, body corporate fees, council rates, repairs, and depreciation on fixtures and fittings. Stamp duty and conveyancing costs are not immediately claimable but form part of your cost base when you sell the property.
How do lenders assess rental income for borrowing capacity?
Lenders typically assess rental income at 80% of the market rent to account for vacancy periods and maintenance costs. If a property rents for $500 per week, the lender treats it as $400 per week when calculating your borrowing capacity.
What is negative gearing and how does it work?
Negative gearing occurs when your investment property expenses exceed your rental income, creating a loss that reduces your taxable income. If your property costs $30,000 per year to hold but only generates $24,000 in rent, that $6,000 loss reduces your tax bill based on your marginal tax rate.
