Top tips to finance investment property in The Basin

Variable rate investment loans give you access to the full offset and redraw features most lenders offer, and they let you pay down principal faster without penalty.

That flexibility matters when you're holding property in The Basin, where the CoreLogic all-dwellings house median sits at $928,000 and annual transaction volumes are modest. With just 59 house sales over the past 12 months to June, you're entering a market where resale can take time, and a loan structure that lets you adapt to changing circumstances is worth the rate risk.

Why Basin investors choose variable rates over fixed

Variable rate loans adjust with the cash rate, which the Reserve Bank held at 4.35 percent at its August 2026 decision. That means your investor rate moves with market conditions, not against them. When you lock a fixed rate on an investment loan, you're committing to a higher rate in exchange for certainty, and you're giving up the ability to make extra repayments or access an offset account without penalty. For Basin investors who plan to use equity release from their existing property to fund further purchases, that restriction is a problem.

Consider a buyer who purchased a 3-bedroom house on a bush block near Benson Road at The Basin's Domain 3-bedroom median of $850,000 in September. They put down 20 percent and took a variable rate loan with a full offset facility. Rental income at the suburb's median of $625 per week covers most of the monthly repayment, and they park their tax refund and any surplus cash in the offset account to reduce the daily interest charge. When rates fall, their repayment drops immediately. When they're ready to buy a second property, they can redraw or refinance without break costs. That flexibility is unavailable on a fixed rate loan.

What vacancy and holding costs look like in The Basin

The Basin sits at the foothills of the Dandenong Ranges, and it attracts tenants looking for space, quiet, and proximity to Boronia and Ferntree Gully town centres. The suburb is predominantly detached housing on larger blocks, and the unit market is negligible. That means your holding costs are higher than a unit investor in neighbouring Boronia or Ferntree Gully, but your tenant base is stable and your vacancy risk is lower than the metro average.

Melbourne's metro rental vacancy rate was 1.7 percent in July 2026, well below the 3 percent level that indicates balanced rental conditions. In a suburb like The Basin, where owner-occupancy is high and rental stock is limited, you're unlikely to see extended vacancy periods once your property is tenanted. But when a tenant does leave, you need cash reserves to cover your repayment while the property is vacant. A variable rate loan with an offset account lets you hold those reserves in the offset, reducing your interest charge every day, rather than sitting in a separate savings account earning taxable interest.

How the investor serviceability buffer affects your borrowing capacity

Every lender applies a serviceability buffer when assessing your investment loan application. The buffer is set by APRA at 3.0 percentage points above the loan product rate, which means if your lender quotes a variable investor rate of 6.5 percent, they assess your ability to repay at 9.5 percent. That assessment applies to the full loan amount, not just the interest-only portion if you're taking interest-only repayments.

For Basin investors, the buffer bites harder than it did 18 months ago because rates have risen. If you're earning $120,000 and you want to borrow $740,000 to purchase at the suburb median, the lender will assess whether you can service that loan at 9.5 percent while also covering your existing mortgage, living expenses, and any other debt. If you're close to the limit, a variable rate loan structure that includes an offset account gives you a way to demonstrate surplus cash flow without formally paying down the loan.

Interest-only versus principal-and-interest on a variable investment loan

Interest-only repayments are available on most variable rate investment loans for an initial period of one to five years. The attraction is cash flow. If you're negatively geared and you're relying on the tax deduction to make the investment work, keeping your repayment low in the early years lets you hold the property through lean periods without selling.

But interest-only is not a permanent feature. When the interest-only period ends, your loan reverts to principal-and-interest repayments, and the monthly repayment jumps. A buyer who took a $740,000 loan on interest-only at 6.5 percent would pay around $4,012 per month in interest alone. When the loan reverts to principal-and-interest after five years, the repayment rises to around $5,350 per month over the remaining 25 years. That increase is manageable if rental income has grown or your personal income has lifted, but it's a problem if neither has moved.

In our experience, Basin investors who plan to hold long-term and who have stable employment choose principal-and-interest from the start, even if it means a higher repayment in year one. The loan balance falls every month, and you're building equity from day one. If rates fall, the benefit flows straight through to your repayment. If you need to refinance to release equity for a second purchase, you're refinancing a lower balance and you can borrow more against the same property.

What negative gearing changes mean for properties purchased after May 2026

The Treasury Laws Amendment (Tax Reform No. 1) Act 2026 received royal assent on 26 June 2026. If you purchased an established house in The Basin after 7:30pm AEST on 12 May 2026, and that property was not classified as a new build, your deductible losses from the 2027-28 income year onward can only be offset against income from other residential properties, not against your salary or wages. Losses you can't use in a given year carry forward and can be used against future residential property income, including capital gains when you eventually sell.

If you purchased before that date, or if you're purchasing a new build after that date, the existing negative gearing rules continue to apply and you can deduct losses against all forms of income. The Basin's unit market is negligible, and the suburb is predominantly older-style detached housing on large blocks. Very few new builds are coming through. That means most Basin investors purchasing after May 2026 are acquiring established housing, and they're subject to the new quarantining rules from the 2027-28 income year.

The variable rate structure doesn't change the tax treatment, but it does let you adapt. If you realise in year two that your negatively geared loss is larger than expected and you can't use the full deduction until you sell or acquire a second property, you can increase your repayments on the variable loan without penalty, reduce your interest cost, and bring your cash flow closer to neutral. A fixed rate loan won't let you do that.

Offset accounts and how they reduce your taxable deduction

An offset account is a transaction account linked to your investment loan. Every dollar in the offset reduces the balance on which interest is calculated, and the interest saving is applied daily. If you have a $740,000 loan at 6.5 percent and you hold $30,000 in the offset, you're only paying interest on $710,000. Over a year, that saves you around $1,950 in interest.

The catch is that the interest you don't pay is interest you can't deduct. If your goal is to maximise your deduction and you're in a high tax bracket, you may prefer to keep the offset balance low and pay the full interest charge, because the deduction is worth more to you than the saving. If your goal is to reduce debt and build equity, you park every dollar you can in the offset and reduce your interest cost regardless of the tax treatment. Most Basin investors we work with do the latter, because they're holding for capital growth and they want to own the property outright within 15 to 20 years.

How LVR and lenders mortgage insurance affect your rate and upfront cost

Your loan-to-value ratio is the loan amount divided by the property value. If you borrow $740,000 to purchase at the Basin median of $928,000, your LVR is approximately 80 percent. Most lenders price investment loans in LVR bands. An 80 percent LVR loan attracts a lower rate than a 90 percent LVR loan, and it doesn't trigger lenders mortgage insurance.

LMI is a one-off premium charged when your LVR exceeds 80 percent. The premium is calculated on a sliding scale and is added to your loan balance unless you pay it upfront. On a 90 percent LVR loan of $835,200 against the Basin median, the LMI premium could be $20,000 or more depending on the lender and insurer. That premium is not tax deductible for residential investment loans under current ATO interpretation. A variable rate loan structure doesn't change the LMI cost, but it does let you refinance to a lower LVR once you've built equity, and potentially remove the LMI-loaded interest rate band you started in.

What to check before you sign your loan documents

Variable rate investment loans are not identical across lenders. Some lenders let you split your loan into multiple accounts, each with its own rate and repayment type. Others restrict offset access on investment loans or charge a higher rate if you choose offset over redraw. The difference in rate between lenders for the same LVR and loan amount can be 40 basis points or more, which on a $740,000 loan is around $2,960 per year.

Before you commit, check the rate, the offset terms, the redraw conditions, any annual fees, and whether the lender will let you switch between interest-only and principal-and-interest without refinancing. Check whether the lender applies a higher serviceability floor to investment loans than to owner-occupier loans, because some do. And check whether the lender will give you access to equity release from your owner-occupied property to fund the Basin purchase, or whether they'll treat the owner-occupied loan as an investment loan once you draw down equity. These details change your borrowing capacity and your long-term flexibility, and they're not visible in the advertised rate.

Call one of our team or book an appointment at a time that works for you. We'll walk through your full position, show you what you can borrow under current APRA serviceability rules, and match you to the lenders who price variable rate investment loans competitively for Basin purchases. We're here to help, and we're with you past settlement.

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