Understanding the basics of Variable Investment Loans

A variable rate investment loan lets you borrow against a rental property while keeping the flexibility to pay extra when you can and access those funds when you need them.

Most property investors across Melbourne and Victoria choose a variable rate structure for their first or second rental property because the loan moves with you as your income, portfolio and strategy change. The rate rises and falls with market conditions, and most variable products include an offset account that turns surplus cash into an interest discount without locking it away.

What a Variable Rate Investment Loan Actually Does

A variable rate investment loan is simply a home loan secured against a rental property where the interest rate adjusts in line with the lender's standard variable rate. When the Reserve Bank changes the cash rate, most lenders adjust their variable rates within days, and your repayment moves accordingly.

The loan can be structured as interest-only or principal and interest. Interest-only keeps the monthly cost lower and maximises the deduction if you are negatively gearing, while principal and interest reduces the loan balance over time and builds equity faster. You can switch between the two during the life of the loan, though most lenders restrict interest-only periods to five years at a time and require reapplication after that.

Consider an investor who purchases a two-bedroom unit in Epping at the suburb's current median. With a 20 per cent deposit and a variable rate loan set to interest-only, their monthly repayment covers only the interest component. If rental income does not meet that repayment, the shortfall can be offset against their taxable income under the current negative gearing rules, provided the property was acquired before the 2026 reforms took effect. The investment loan structure lets them direct surplus income into the offset account rather than paying down the principal, preserving liquidity for the next purchase.

How an Offset Account Turns Cash Into Interest Savings

An offset account reduces the interest charged on your loan by the balance sitting in the account, without locking that money inside the loan itself.

If your loan balance is $400,000 and you hold $30,000 in a linked offset account, you pay interest on $370,000. The $30,000 remains accessible through a debit card or bank transfer, so you keep full control while reducing what you owe the lender each month. The interest saved on an investment loan is not a deduction because you are not actually paying it, but you reduce the non-deductible portion of your total debt, and that matters when you are juggling owner-occupied and investment borrowing.

For investors who rent out a property in Craigieburn or Mernda and live elsewhere, the offset account becomes a place to park rental income, tax refunds and any other surplus cash. That balance reduces the interest charged on the investment property loan, and the money stays liquid if you need to cover a vacancy, pay for repairs, or top up a deposit for a second property. You can read more about how we support investors in Craigieburn, South Morang and Mernda on the relevant suburb pages.

Why Investors Choose Variable Over Fixed for Flexibility

Variable rate loans allow extra repayments, full redraw, offset accounts and penalty-free refinancing. Fixed rate loans lock the rate for a set period but typically remove those features or charge break costs if you exit early.

If you plan to sell, refinance or access equity within three years, a variable loan avoids the financial penalty that comes with breaking a fixed contract. If interest rates fall, your repayment falls with them. If rates rise, you pay more, but you retain the ability to refinance to a better deal without waiting for a fixed term to end. That flexibility matters when you are building a portfolio and your strategy changes as opportunities appear.

In our experience, investors who are acquiring multiple properties within a short window prefer variable structures because they can refinance or consolidate loans as each new purchase settles. Locking in a fixed rate on property one can make it harder to restructure debt when property two comes along six months later.

Variable Rate Investment Loans and the New Negative Gearing Rules

From 1 July 2027, rental losses on residential properties acquired on or after 7:30pm AEST on 12 May 2026 can only be offset against other residential rental income or carried forward. They cannot be offset against salary or wages unless the property qualifies as an eligible new build.

Properties held before that date continue under the old rules, so if you purchased an established unit in Wollert in early 2026, you can still claim the full rental loss against your taxable income. If you purchase an established townhouse in Epping after the cut-off, any shortfall between rent and loan repayments is quarantined and carried forward until you have rental income or a capital gain to absorb it.

Eligible new builds retain access to traditional negative gearing. A new build is defined as a dwelling constructed on previously vacant land, or a development that increases the number of dwellings on the site. A knock-down rebuild that replaces one house with one house does not qualify. If a new build is occupied for more than 12 months before being sold to you, it loses the exemption in your hands.

This means the choice between established and new stock now carries a different tax outcome, and that outcome affects how much rental loss you can use each year. A variable rate loan does not change the tax treatment, but the offset account becomes more valuable because reducing the interest you pay reduces the loss you are carrying forward.

How Lenders Assess Investment Loan Applications Under the DTI Cap

From 1 February 2026, lenders can fund no more than 20 per cent of new investor loans at a debt-to-income ratio of six times or greater. DTI is calculated as total debt divided by gross income, and it is measured separately for investor and owner-occupier portfolios.

If your household income is $120,000 and your total debt across all loans is $720,000 or more, you sit at or above the six times threshold. Lenders can still approve the loan, but it counts toward their 20 per cent cap, and that makes approval less certain. If the lender has already used most of their allocation for the quarter, your application may be declined or delayed even if you meet all other criteria.

Rental income is not added to your household income at 100 per cent. Most lenders apply a haircut of 20 per cent to account for vacancy and costs, so if the property generates $2,000 per month in rent, the lender assesses it as $1,600. That rental income improves your borrowing capacity, but it does not reduce your DTI because DTI is measured against employment and business income only. The DTI cap applies across your entire loan book, not to each individual loan, so a second or third investment property pushes your ratio higher even if each property is cash-flow positive.

Interest-Only Versus Principal and Interest for Investment Loans

Interest-only repayments reduce your monthly cost and preserve cash flow, making them a common choice for investors who want to maximise the deduction or redirect surplus income into another deposit. Principal and interest repayments reduce the loan balance over time and build equity, which can be released later to fund further purchases.

Most lenders allow interest-only periods of up to five years on investment loans, after which the loan reverts to principal and interest unless you apply for an extension. Each extension is assessed as a new application, and if your income, employment or portfolio position has changed, the lender may decline the request or require you to revert to principal and interest.

If you hold a variable rate loan with an offset account, paying principal and interest while maintaining a large offset balance gives you a similar cash flow outcome to interest-only without the time limit. The principal portion of your repayment builds equity inside the loan, and the offset balance reduces the interest component. When you need cash, you draw from the offset instead of redrawing from the loan, which keeps your debt structure cleaner and avoids the risk of converting investment debt into private debt.

When to Refinance a Variable Investment Loan

You should consider refinancing when your current rate sits more than 0.30 percentage points above the lowest rate available to you for the same loan features and loan-to-value ratio, or when you need to release equity and your current lender will not extend further credit.

Refinancing an investment loan does not trigger capital gains tax or affect your negative gearing position, but it does require a full credit assessment and a new valuation. If the property has increased in value since purchase, you may be able to borrow against that equity without selling. If the value has fallen or remained flat, your loan-to-value ratio may have increased, and you may not qualify for the same rate discount you held on the original loan.

A loan health check every 12 to 18 months helps you identify when your rate has drifted above market or when your lender has tightened policy in a way that affects your next purchase. We regularly see investors who remain on a variable rate 0.50 to 0.80 percentage points above current market offers simply because they have not asked the question. Over a $400,000 loan, that difference costs several thousand dollars a year in interest that could have been avoided or redirected into the offset account.

Call one of our team or book an appointment at a time that works for you using the link on our appointment page. We compare investment loan options from lenders across Australia and structure the loan to match where your portfolio is heading, not just where it is today.

Frequently Asked Questions