Simple hacks to structure investment loans correctly

Investment loans work differently depending on whether you lock in a fixed rate, stay variable, or split between both.

Tech professionals often approach property investment the same way they approach system design: looking for modularity, flexibility, and the ability to iterate as conditions change. The loan structure you choose affects how much flexibility you keep, how borrowing capacity is calculated by lenders, and how you respond when rates move or your income changes.

Why variable rates suit investors who refinance or pay down debt

A variable rate means the interest rate on your loan moves in line with the lender's standard rate changes. Most variable investment loans let you make unlimited extra repayments, redraw those funds later, and refinance or exit without penalty.

Consider a software engineer who holds two investment properties and plans to leverage equity from the first to fund a deposit on the second within 18 months. A variable rate structure means no break costs when refinancing to release equity, and the ability to redraw any extra payments made in the interim if a deposit shortfall appears. In our experience, investors with fluctuating income from RSUs or performance bonuses value that redraw access because it lets them park surplus cash in the loan and retrieve it later without reapplying for credit.

Variable rates also respond immediately to rate cuts. When the Reserve Bank reduces the cash rate, most lenders pass through at least part of that cut within weeks. For an investment loan held at a variable rate, that translates to lower repayments or a faster reduction in principal if you keep payments steady.

Fixed rates lock in certainty but remove flexibility

A fixed rate holds your interest rate constant for a set term, typically one to five years. During the fixed period, most lenders restrict extra repayments to a cap of around $10,000 to $30,000 per year and charge break costs if you refinance, sell the property, or repay the loan early.

Fixed rates suit investors who want predictable repayments and believe rates will rise during the fixed term. The trade-off is rigidity. If you need to access equity to fund another purchase, or if your circumstances change and you want to switch lenders for a lower rate, you may face break costs calculated on the lender's wholesale funding loss. Those costs can run into thousands of dollars depending on how far rates have moved since you fixed.

Under the current APRA serviceability buffer, lenders assess your ability to service any new borrowing at a rate 3.0 percentage points above the loan product rate. A fixed rate loan is assessed at the fixed rate plus buffer, not the lender's current variable rate. If fixed rates are lower than variable rates at the time you apply for additional borrowing, a fixed loan can sometimes improve your serviceability position when applying to expand your property portfolio.

Split loans let you hedge without committing fully to either path

A split loan divides your borrowing into two or more portions, with each portion on a different rate type. A common split is 50 per cent fixed and 50 per cent variable, though any ratio is possible.

In a scenario where a data analyst borrows $600,000 to purchase a rental property, she might fix $300,000 for three years and leave $300,000 variable. The fixed portion delivers stable repayments on half the loan, while the variable portion allows unlimited extra repayments and redraw access without penalty. If she receives a $40,000 bonus, she can deposit it into the variable portion offset account or make an extra repayment, reducing interest on that half of the loan immediately. If rates fall, the variable portion benefits. If rates rise, the fixed portion protects half the loan.

Splits also let you stagger fixed rate expiry dates by fixing different portions for different terms. That way, not all your borrowing reverts to variable rates on the same day, reducing the impact of a single adverse rate movement at expiry.

How offset accounts and interest-only periods interact with rate structure

Most variable investment loans offer an offset account, which is a transaction account linked to the loan. The balance in the offset account reduces the loan balance on which interest is calculated, but the funds remain accessible.

Fixed rate loans rarely include a full offset. Some lenders offer a partial offset during a fixed term, where only a percentage of the account balance offsets the loan, or they offer no offset at all. If you plan to accumulate rental income, bonuses, or other cash reserves in an offset to minimise interest, a variable or split structure is more suitable.

Interest-only periods are available on both fixed and variable investment loans. During the interest-only period, you pay only the interest component each month, not principal. That keeps repayments lower and can improve cash flow, particularly if rental income does not cover the full principal-and-interest repayment. Once the interest-only period ends, the loan reverts to principal-and-interest repayments, which are higher because the principal must now be repaid over the remaining loan term. Choosing interest-only loans affects your cash flow and borrowing capacity, but does not change the way fixed, variable, or split rates function.

What changed with negative gearing and capital gains tax from mid-2026

Investment properties purchased on or before 12 May 2026 continue to allow full negative gearing, meaning any loss from the property, including interest costs, can be offset against your salary or other income. Properties purchased after that date are subject to new rules that limit loss deductions to income from residential property only, unless the property qualifies as a new build.

For investors in tech roles with high taxable income, the deductibility of interest remains valuable, but the scope of that deduction depends on the acquisition date. If you are considering purchasing your first investment property, the distinction between an established dwelling and a new build now directly affects the tax treatment of your loan interest.

From 1 July 2027, capital gains on investment properties will be taxed under a new regime that replaces the 50 per cent CGT discount with cost base indexation and a 30 per cent minimum tax rate on real gains accruing after that date. Properties held before 1 July 2027 will have gains apportioned between the old and new rules. This does not change the interest rate structure of your loan, but it does change the after-tax return on the asset securing that loan.

When refinancing makes sense and when it triggers costs

Refinancing an investment loan can deliver a lower interest rate, access to equity, or a switch from interest-only to principal-and-interest repayments. Variable rate loans can be refinanced at any time without penalty. Fixed rate loans incur break costs if refinanced before the fixed term ends.

We regularly see investors who fixed their investment loans during the 2021 and 2022 rate rises now considering whether to refinance as their fixed terms expire. If the fixed term has ended, no break costs apply, and refinancing to a lower rate or better product is straightforward. If the fixed term has not yet ended, you need to weigh the interest saving from a lower rate against the break cost charged by the current lender.

Investment loan refinancing also gives you an opportunity to restructure your loan, split it differently, or consolidate multiple investment loans under one facility if that improves serviceability or simplifies administration.

Choosing a structure that matches your actual plans

The right structure depends on what you plan to do over the next two to five years. If you expect to refinance, release equity, or sell within that period, a variable rate avoids exit penalties. If you want stable repayments and have no plans to access equity or change lenders, a fixed rate can lock in certainty. If you want both, a split divides the loan so you are not forced to choose one or the other.

Many investors default to whatever structure their bank offers without considering how it aligns with their income pattern, portfolio plans, or risk tolerance. A fixed rate that looks appealing because of rate stability becomes a problem if you need to refinance early. A variable rate that offers flexibility becomes a cost if rates rise sharply and your rental income does not keep pace.

If your income includes variable components such as bonuses, RSUs, or contractor payments, consider whether you want redraw or offset access to smooth cash flow between income events. If you are planning to purchase a second property within 18 months, consider whether you will need to refinance the first loan to release equity, and whether a fixed rate will still be in place at that point.

Call one of our team or book an appointment at a time that works for you. We work with tech professionals who want their investment loan structure to align with how they actually earn, save, and build wealth, not just what the lender happens to offer that week.

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