Why Fixed Rates and Offsets Don't Work on Investment Loans

Fixed rate investment loans do not support offset accounts.

The reason is structural. A lender prices a fixed rate by locking in their own funding cost for the term you choose. An offset account reduces the interest you pay without changing the loan balance, which means the lender's funding cost stays the same while their revenue drops. That creates a mismatch the lender will not accept. Variable rate loans allow offsets because the lender can reprice the loan as funding costs move. Fixed rate loans cannot.

Why ADF Members in Victoria Consider Fixed Rates for Investment Loans

Fixed rates lock in borrowing costs for a set term, typically between one and five years. For ADF members posted to locations such as Puckapunyal or the Flinders Naval Depot, a fixed rate removes uncertainty around loan repayments during a posting cycle. If rental income covers the fixed repayment, you know exactly what the shortfall will be each month. That clarity helps when planning around deployment, relocation or a period of reduced income.

Fixed rates are priced higher than variable rates in most rate cycles. Lenders price in a margin for the certainty they provide. For an investment loan, that margin is higher again because investor lending attracts greater capital risk weights under APRA Prudential Standard APS 112. In our experience, ADF members who fix do so because they value certainty over cost, particularly when they are managing a property remotely or need to forecast cash flow around a deployment.

How Offset Accounts Work on Variable Rate Investment Loans

An offset account is a transaction account linked to your loan. The balance in the offset is subtracted from your loan balance before interest is calculated each day. If your loan balance is $450,000 and you hold $30,000 in the offset, you pay interest on $420,000. The loan balance does not change and the offset balance remains accessible.

For investment loans on a variable rate, the offset provides a tax-efficient place to park cash. Interest saved on the loan is equivalent to interest earned on a deposit account, but without the need to declare the interest as assessable income. This is particularly useful for ADF members who receive allowances or separation entitlements and want to hold cash without triggering a tax event. The offset balance can be accessed at any time, so it also functions as a liquidity buffer for vacancy periods, urgent repairs or settlement costs on a second property.

The Split Strategy Some ADF Investors Use in Victoria

Some lenders allow you to split a single investment loan into two portions, one fixed and one variable. The variable portion supports an offset account. The fixed portion does not.

Consider an ADF member purchasing a rental property in a regional Victorian town near a base. The loan amount is $500,000. They split $350,000 onto a fixed rate for three years and $150,000 onto a variable rate with an offset attached. Rental income is directed into the offset, along with any surplus from their salary. The fixed portion provides certainty on the majority of the debt, and the variable portion with offset provides flexibility and a place to hold surplus cash.

The outcome is that $350,000 of debt is quarantined from rate movements, and any cash held in the offset reduces interest on the $150,000 variable portion. If the offset balance reaches $150,000, the variable portion charges no interest at all. The structure works for members who want some certainty but also expect irregular cash flow or plan to accumulate funds toward a future deposit.

The weakness in this approach is complexity. You hold two loan accounts, each with separate terms and repayment schedules. If you want to pay down the loan faster, additional repayments must go to the variable portion only. Paying extra on the fixed portion may trigger break costs. Some lenders charge a second set of ongoing fees for the split. You also need to be deliberate about which portion you reduce first when refinancing or restructuring the loan.

What Happens When a Fixed Rate Term Ends

At the end of the fixed term, the loan reverts to the lender's standard variable rate unless you choose another fixed term or refinance. The standard variable rate is typically higher than the lender's advertised variable rate for new borrowers. That reversion rate can add between 0.5 and 1.2 percentage points to your interest cost if you do not act.

For ADF members, the end of a fixed term often coincides with a posting or deployment. If you are offshore or interstate when the fixed term expires, the loan reprices automatically. You do not lose the loan, but you pay more than you need to. Setting a calendar reminder six months before the fixed term ends allows you to review your options, request a rate reduction from your current lender or refinance to another lender offering a lower rate. Many ADF investors we work with set that reminder at the same time they settle the loan.

Once the fixed term ends and the loan moves to a variable rate, you can request that an offset account be attached. Not all lenders allow this without a formal variation or refinance, but most will accommodate it if the loan is otherwise performing. The offset becomes available from the date the variation is processed, not retrospectively.

Interest-Only Repayments and Fixed Rates

Most investment loans can be structured as interest-only for a period, typically up to five years initially. During that period, you pay only the interest charged each month and the loan balance does not reduce. Interest-only repayments are lower than principal-and-interest repayments, which improves cash flow and can reduce the amount of after-tax income required to cover any shortfall between rent and loan costs.

You can fix an interest-only investment loan, and the same restriction applies. No offset account is available while the loan is fixed. Once the interest-only period ends, the loan converts to principal and interest and the repayment increases. If the loan is still fixed at that point, the repayment is recalculated based on the remaining fixed term. If the loan has reverted to variable, the repayment is calculated over the remaining loan term, which may be 25 years or more depending on the original term.

For ADF members using interest-only loans as part of a property investment strategy, the lack of offset access during a fixed period is a trade-off. The interest-only structure maximises deductibility of interest because the loan balance stays higher for longer, but the absence of an offset means you cannot reduce interest costs by parking surplus funds against the loan. You can still hold surplus cash in a separate savings account, but any interest earned is assessable income and does not reduce your loan interest.

When Fixed Rates Cost More Than the Interest They Save

Fixed rates protect you from rate rises, but they lock you in if rates fall. If the variable rate drops below your fixed rate during the fixed term, you pay more than you would have on a variable loan. You also pay break costs if you exit the fixed loan early.

Break costs are calculated based on the difference between the fixed rate on your loan and the wholesale funding cost the lender can now achieve for the remaining term. If rates have fallen, the lender has lost income and you are charged the present value of that loss. Break costs can reach tens of thousands of dollars on a large loan with several years remaining. They apply if you refinance, sell the property or make a lump sum repayment above a small threshold, typically $10,000 per year.

For ADF members, this creates a specific risk. If you are posted unexpectedly and need to sell the investment property, or if your circumstances change and you need to access equity, the fixed rate becomes a barrier. The cost to exit can exceed the benefit you gained from fixing in the first place. Variable rates do not carry this penalty. You can repay in full or refinance at any time without cost, other than discharge fees which are typically under $400.

The Decision Framework for ADF Investors in Victoria

The choice between fixed and variable on an investment loan comes down to three factors: your tolerance for repayment fluctuations, your expected cash flow and your likelihood of needing flexibility over the next few years.

If you are posted to a Victorian base for a defined period and you know you will hold the property throughout that period, a fixed rate provides certainty. If you expect to receive allowances, separation entitlements or other variable income and want to park that cash in an offset, a variable rate is the better fit. If you expect to sell, refinance or purchase another property within three years, a variable rate keeps your options open. If you want both certainty and flexibility, a split structure may work, but only if the added complexity is manageable.

For members expanding a property portfolio, the offset becomes more important. Surplus cash from one property can sit in an offset linked to another loan, reducing interest while staying accessible for the next deposit. Fixed rates on investment loans do not support this approach.

Call one of our team or book an appointment at a time that works for you. We work with ADF members across Victoria and can structure investment loans around posting cycles, deployment schedules and the specific requirements of Defence income.

Frequently Asked Questions