A variable rate investment loan allows your interest rate to move up or down in response to market conditions, which means your repayments can change throughout the life of the loan.
Most property investors choose variable rates because they offer flexibility that fixed rates do not, including the ability to make extra repayments without penalty, access to offset accounts, and the option to refinance without break costs. Variable rates also allow you to take advantage of rate cuts when they occur. The trade-off is that your repayments can increase when rates rise, which affects cash flow and serviceability.
The regulatory environment has tightened considerably for investment lending. From 1 February 2026, banks assess investor loan applications against a debt-to-income limit, allowing only 20 per cent of new investor loans to be written to borrowers with a total debt-to-income ratio of six times or greater. Combined with the ongoing 3.0 percentage point serviceability buffer, this means borrowers need to demonstrate they can service the loan at a rate well above the actual product rate. Variable rate loans are assessed under the same serviceability rules as fixed rate loans, but the flexibility they offer after settlement can make a meaningful difference to portfolio growth over time.
How Lenders Price Variable Rate Investment Loans
Variable rate investment loans are priced higher than owner-occupier loans because they attract higher risk weightings under banking prudential standards. Banks must hold more capital against investment loans, and that cost is passed to borrowers through a higher interest rate.
The margin between investor and owner-occupier variable rates typically sits between 0.30 and 0.70 percentage points, depending on the lender, the loan-to-value ratio and whether the loan is interest-only or principal and interest. Interest-only investment loans attract the highest rates because they carry the highest capital cost for the lender. A borrower with an 80 per cent LVR interest-only investment loan will generally pay more than a borrower with a 70 per cent LVR principal and interest loan, even with the same lender.
Rate discounts are negotiable, particularly for borrowers with strong serviceability, low LVRs, or multiple properties with the same lender. However, discounts are not static. A lender may offer a larger discount at settlement to win the business, then reduce that discount over time as part of portfolio repricing. This is one reason why refinancing becomes relevant even when the underlying cash rate has not changed.
Interest-Only Repayments on Variable Rate Investment Loans
Interest-only repayments allow you to pay only the interest charged each month, without reducing the loan balance, for a set period.
Most lenders offer interest-only periods of one to five years on investment loans, after which the loan reverts to principal and interest repayments. Interest-only loans are commonly used by property investors to maximise tax deductions and preserve cash flow, particularly where rental income does not fully cover the loan repayment. Under current tax rules, interest on borrowings used to acquire or hold rental property is deductible against assessable income, which makes interest-only structures attractive for negatively geared properties.
Consider a borrower who purchases an established investment property after 12 May 2026. Under the grandfathering provisions of the Treasury Laws Amendment (Tax Reform No. 1) Act 2026, properties held at 7:30pm AEST on 12 May 2026 continue to allow full negative gearing deductions against all income. Properties acquired after that date, unless they are eligible new builds, can only deduct losses against other residential property income from the 2027-28 income year onward. The borrower in this scenario opts for a five-year interest-only period on a variable rate loan to minimise monthly repayments during the first few years of ownership. After five years, the loan converts to principal and interest, which increases the monthly repayment. The borrower plans to refinance before the end of the interest-only period, either to extend the interest-only term with another lender or to access equity for a second purchase.
Offset Accounts and Variable Rate Loans
An offset account is a transaction account linked to your investment loan, where the balance in the account reduces the loan balance on which interest is calculated.
If you have a variable rate investment loan with a balance of $500,000 and $50,000 sitting in a linked offset account, you only pay interest on $450,000. The benefit accumulates daily, which reduces the total interest paid over the life of the loan. Offset accounts are only available on variable rate loans. Fixed rate loans do not offer this feature.
For property investors, offset accounts introduce a tax consideration. Interest on investment loans is deductible, but only to the extent the loan is used to acquire or hold the investment property. If you deposit personal savings into an offset account linked to an investment loan, the interest saving is not assessable income, but it does reduce your deductible interest expense. Despite this, offset accounts remain one of the most valuable features of a variable rate investment loan because they provide liquidity and flexibility without requiring you to pay down the loan balance permanently. Funds held in offset can be withdrawn at any time without needing to redraw or reapply for credit.
What Happens When the Reserve Bank Changes Rates
When the Reserve Bank changes the official cash rate, most lenders adjust their variable loan rates within a few days, though not always by the same amount.
A 0.25 percentage point cut in the cash rate might translate to a 0.20 or 0.25 percentage point reduction in your variable investment loan rate, depending on the lender's funding costs and competitive position. Rate rises are typically passed through in full. If you are on a variable rate and the cash rate increases by 0.50 percentage points over two consecutive months, your repayments will increase accordingly unless you have an offset account that absorbs some of the impact.
Variable rates allow you to benefit immediately when rates fall, without needing to refinance or break a fixed term. This was particularly relevant during periods of rate easing, where borrowers on variable rates saw repayment reductions within weeks of a central bank decision. The reverse also applies. Borrowers on variable rates during a tightening cycle experience repayment increases quickly, which can affect cash flow if rental income has not increased at the same pace.
Switching Between Variable and Fixed Rates
Most lenders allow you to switch from variable to fixed at any time without penalty, though the process requires a formal application and rate lock.
Switching from fixed to variable, or breaking a fixed rate early, typically involves break costs calculated based on the difference between your fixed rate and the lender's current funding cost for the remaining fixed period. Refinancing to a new lender before the end of a fixed term will trigger these costs, which can run into thousands of dollars depending on the size of the loan and how much time remains.
Some investors use a split loan structure, where part of the loan is fixed and part remains variable. This approach provides some protection against rate rises while maintaining access to offset and redraw on the variable portion. Split loans are available on investment loans with most major lenders, and the split can be adjusted at the end of the fixed term.
Portfolio Growth and Variable Rate Flexibility
Variable rate loans support portfolio growth because they allow you to access equity and refinance without penalty.
As your property increases in value, the equity available for deposit on a second purchase grows. If you are on a variable rate, you can refinance to release that equity at any time. If you are on a fixed rate, you either wait until the fixed term ends or pay break costs to access the equity earlier. For investors focused on acquiring multiple properties over a short period, variable rates remove a timing constraint that fixed rates impose.
Consider a borrower who purchased an investment property 18 months ago on a variable rate loan. The property has increased in value, and the borrower now has sufficient equity to use as a deposit for a second investment property. The borrower applies to refinance the existing loan to release equity and simultaneously applies for a new investment loan. Both applications are assessed under the debt-to-income limits and serviceability buffer introduced in early 2026, but because the borrower's income has increased and the existing loan balance has reduced slightly through offset savings, the application is approved. The borrower now holds two investment properties, both on variable rates, and retains the flexibility to refinance or release further equity as the portfolio grows. The ability to act quickly without waiting for a fixed term to expire was central to the timing of the second purchase.
Managing Rate Rises on Variable Investment Loans
When variable rates increase, investors can reduce the impact by increasing offset balances, switching to principal and interest repayments if currently on interest-only, or refinancing to a lender with a lower rate.
Some investors increase rent to cover the higher repayment, but this depends on the rental market in the property's location and whether comparable properties are achieving similar rent levels. Vacancy rates and tenant demand vary by suburb and property type, which limits how much rent can be increased without risking a vacancy period. If the property is negatively geared, an increase in interest costs also increases the deductible loss, which provides some offset at tax time depending on the investor's marginal tax rate and whether the loss is fully deductible under the current or new negative gearing rules.
Another option is to request a rate review from your current lender, particularly if you have been with the lender for several years and have not refinanced. Lenders are more willing to negotiate when a borrower has demonstrated consistent repayment history and has equity in the property. A reduction of 0.10 to 0.20 percentage points can make a material difference to annual interest costs without needing to go through a full refinance process.
What to Consider Before Choosing a Variable Rate
A variable rate suits investors who value flexibility, expect to refinance within a few years, or want to take advantage of rate cuts when they occur.
It is less suitable for investors who need fixed repayments for budgeting purposes or who are borrowing at or near their serviceability limit and cannot absorb rate rises. Serviceability is tested at the loan rate plus 3.0 percentage points, which means you are assessed on your ability to repay at a rate significantly higher than the current market rate. However, if rates increase beyond that buffer, your actual repayments will still increase, even though you passed the serviceability test at settlement.
Variable rates also suit investors who intend to use offset accounts to manage cash flow and reduce interest costs over time. The combination of offset access and repayment flexibility makes variable rates the default choice for most property investors, particularly those building a portfolio rather than holding a single property long term.
Call one of our team or book an appointment at a time that works for you to discuss whether a variable rate investment loan aligns with your property investment strategy and borrowing capacity.
Frequently Asked Questions
Can I switch from a variable rate investment loan to a fixed rate?
Yes, most lenders allow you to switch from variable to fixed at any time without penalty, though you will need to apply and lock in the fixed rate. Switching from fixed to variable usually involves break costs.
Do variable rate investment loans allow extra repayments?
Yes, variable rate investment loans allow unlimited extra repayments without penalty. However, paying down an investment loan reduces your deductible interest, so many investors use offset accounts instead to preserve liquidity.
How quickly do variable rates change after a Reserve Bank decision?
Most lenders adjust variable rates within a few days of a Reserve Bank rate change, though the size of the adjustment may differ between lenders. Rate increases are typically passed through in full, while rate cuts may be passed through partially.
Are variable rate investment loans priced higher than owner-occupier loans?
Yes, variable rate investment loans are priced higher than owner-occupier loans because they attract higher capital requirements for lenders under prudential standards. The margin typically ranges from 0.30 to 0.70 percentage points depending on the loan structure and LVR.
Can I use an offset account with an interest-only investment loan?
Yes, offset accounts are available on both interest-only and principal and interest investment loans, provided the loan is on a variable rate. Fixed rate loans do not offer offset accounts.
