Top tips to use variable rate investment loans

A variable rate on an investment loan means you can make extra repayments, switch between interest-only and principal-and-interest, and pull equity when the next opportunity turns up without triggering break costs.

Why variable rates suit property investors across different stages

Variable rate products let you adjust the loan as your strategy or circumstances shift. You can redraw funds if you've paid ahead, move to interest-only if you need to free up cashflow, or switch back to principal-and-interest without refinancing. That flexibility matters when rental income drops temporarily or when you want to leverage equity for a second purchase.

In our experience, self-employed borrowers value this structure because income can swing between years. A tradie who invoices $180,000 one year and $140,000 the next still needs to manage repayments, and a variable loan with an offset account and redraw gives breathing room that a fixed term doesn't.

Say you pick up a two-bedroom unit in Prospect as your first investment. Rental income covers most of the repayment, and you want to pay down the loan faster when work is steady. A variable rate lets you drop an extra $500 a month into the loan without penalty, then redraw that amount if a repair bill lands or if your next tax return shows a lower profit. That redraw buffer can cover a few months of vacancy or a hot water system replacement without touching your offset or personal savings.

How the offset account works with a variable investment loan

An offset account linked to your investment loan reduces the interest charged each day by the balance sitting in the account. If you have a $400,000 loan and $20,000 in offset, you only pay interest on $380,000. The rental income can sit in the offset between expenses, and the interest saving compounds over time.

Keep the offset separate from your personal accounts. Rental income goes in, property expenses come out, and the interest deduction stays clean. Mixing personal funds with investment cashflow makes tax time harder and increases the risk of part of your interest being disallowed by the ATO.

Some lenders offer full offset on variable investment loans, others offer partial offset or no offset at all. The difference in rate between a loan with full offset and one without can be 0.20 to 0.40 percentage points. Whether that trade-off works depends on how much surplus cashflow you expect to hold and for how long.

Interest-only repayments in the early years of ownership

Interest-only repayments reduce your monthly outgoing and improve cashflow, which matters when you're establishing a rental property or when rental yield is tight. An interest-only period on a variable loan typically runs for one to five years, and you can often extend or convert back to principal-and-interest without refinancing.

Under prudential standard APS 112, a loan with an interest-only period longer than five years and an LVR above 80 per cent is classified as non-standard, which increases the lender's capital requirement and usually results in a higher rate or a decline. Most lenders cap the initial interest-only term at five years for investment loans above 80 per cent LVR.

Consider a scenario where you acquire a rental property while you're still paying down your own home. You want to minimise the investment loan repayment so you can keep chipping away at the owner-occupied mortgage, which isn't tax deductible. An interest-only variable loan lets you do that for the first few years, then you switch to principal-and-interest once the owner-occupied debt is cleared or reduced.

Rental income on investment property in suburbs like Walkerville or Unley typically covers interest but not always principal and interest combined, depending on your purchase price and deposit. Interest-only keeps the holding cost lower while the property appreciates, and you can access that equity later without selling.

Switching from interest-only to principal-and-interest mid-term

You can request a switch from interest-only to principal-and-interest on a variable loan at any point, and most lenders process the change without a full credit assessment if the loan is performing and your circumstances haven't materially worsened. The repayment increases, but you start reducing the loan balance and building a buffer for future purchases.

The reverse switch, from principal-and-interest to interest-only, usually requires a new application and evidence that rental income or other income can service the loan under current policy. Lenders apply the serviceability buffer, currently 3.0 percentage points above the loan rate, to any new assessment. If rates have increased since you first borrowed, that buffer might reduce your serviceability and delay or prevent the switch.

When income is lumpy or seasonal, as it often is for self-employed borrowers, the ability to toggle between repayment types on a variable rate investment loan keeps the loan sustainable without forcing a refinance every time your strategy shifts.

Using equity in an existing property to fund the next purchase

Once your investment property has gained value or the loan balance has reduced, you can access that equity to fund a deposit on a second property. A variable rate loan allows you to increase the limit or split the loan without break costs, provided you meet current borrowing capacity and serviceability rules.

Lenders calculate usable equity as 80 per cent of the property value minus the outstanding loan balance, or up to 90 per cent if you're willing to pay LMI again. Equity release usually requires a valuation and a full credit assessment under current policy, including the DTI limit that applies from 1 February 2026. Under that limit, lenders can only write 20 per cent of new investor loans to borrowers with a total DTI of six times or more.

Say your Prospect unit was purchased a few years back and has increased in value. You now have $80,000 in usable equity and want to buy a second rental. You increase the loan on the first property to release that equity, use it as a deposit on the second, and claim the interest on both loans as a deduction because both properties produce rental income. The variable rate means you can make that increase without waiting for a fixed term to expire.

This approach works when rental income from both properties, combined with your other income, can service both loans under the buffer. For self-employed borrowers, lenders typically assess income using two years of tax returns or accountant-prepared financials, and rental income is shaded by a vacancy factor, often 20 per cent, depending on the lender and location.

Refinancing a variable investment loan to access better terms

Variable loans don't lock you in, so you can refinance when another lender offers a lower rate, a higher loan amount, or product features that suit your strategy. Rate discounts on investment loans vary by lender, loan size, and LVR, and the difference can be 0.50 percentage points or more.

Refinancing makes sense when the rate saving over two years exceeds the cost of the switch, including valuation, discharge, and application fees. Some lenders rebate those costs or offer cashback, particularly for loan amounts above $500,000. You can also refinance to consolidate multiple investment loans, release equity, or move from interest-only to principal-and-interest with a longer repayment term.

Timing matters for self-employed borrowers. If your most recent tax return shows a lower profit due to reinvestment or a tough year, wait until the next return is lodged before applying. Lenders assess your current financial position, and a stronger return improves serviceability and rate outcome.

Call one of our team or book an appointment at a time that works for you. We work with self-employed investors across Australia and can walk through loan structure, offset setup, and how the new negative gearing rules affect property you acquire from here.

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