Why Fixed, Variable & Split Investment Loans Matter

Which type of investment loan should you actually choose?

Variable rate, fixed rate, or a split between the two. Each structure affects how much you pay, how flexible you are, and how exposed you become to rate movements.

A variable rate loan moves with the official cash rate and lender pricing decisions. Your repayment changes when rates change. A fixed rate loan locks in a set interest rate for a nominated term, usually between one and five years. Your repayment stays the same during that period. A split loan divides your borrowing across both structures, giving you partial certainty and partial flexibility.

The choice depends on where you sit in your investment timeline, what kind of cash flow buffer you carry, and whether you expect to need access to offset features or early repayment options. Each structure delivers something different.

What a variable rate investment loan offers

A variable rate loan adjusts whenever your lender changes their investor interest rate. That means your repayment can rise or fall between statements.

Most variable rate investment loans include full offset accounts, unlimited additional repayments, and the ability to redraw funds if you are ahead on your loan. For investors holding properties over the long term and using offset to manage rental income and deductible expenses, variable structures tend to offer more day-to-day control.

If you are planning to pay down debt ahead of schedule or draw on redraw to fund a second purchase, variable products allow that movement without penalties. Rate discounts also tend to be deeper on variable loans compared to fixed, particularly where you hold multiple properties or have a larger total loan amount with the one lender.

What a fixed rate investment loan offers

A fixed rate loan sets your investor interest rate for a defined period, typically one to five years. Your repayment stays constant regardless of what the Reserve Bank or your lender does with rates during that window.

Fixed loans provide certainty, especially if your rental income only just covers your interest-only repayment and you cannot absorb a sudden increase. That predictability can make budgeting and portfolio planning more reliable. But fixed loans come with restrictions. Most do not allow offset accounts, and additional repayments are capped, usually between $10,000 and $30,000 per year depending on the lender. If you sell or refinance before the fixed term ends, break costs apply. These costs reflect the lender's funding loss and can run into thousands of dollars depending on how far rates have moved since you locked in.

For investors expecting rate rises in the near term and wanting to cap their exposure, fixing can make sense. For those who value access to equity or flexibility to restructure, the trade-off often tips the other way.

Why split loans exist and when they work

A split loan divides your borrowing into two portions. One part sits on a fixed rate, the other on variable. You nominate the split when you settle, commonly 50/50 but it can be any proportion.

This structure gives you partial protection from rate rises while keeping partial access to offset and redraw. In our experience, splits suit investors who want to lock in a portion of their repayment but still maintain flexibility for portfolio growth or unexpected expenses on the property.

Consider an investor holding a townhouse who borrows $600,000. They fix $300,000 at a set rate for three years and leave $300,000 on variable with a full offset account. Rental income flows into the offset account attached to the variable portion, reducing interest charged on that half of the loan. Meanwhile, the fixed portion locks in protection if rates climb. If they decide to access equity to fund a second property within that three-year window, they can refinance the variable portion without triggering break costs on the fixed side.

The outcome depends on where rates go, but the structure itself delivers control regardless of direction. Splits work when you value both certainty and access.

How interest-only periods interact with loan type

Most lenders allow interest-only repayments on investor loans for up to five years initially, with possible extensions depending on equity and serviceability. Whether you choose variable, fixed, or split, the interest-only option is available on all three.

Interest-only keeps your repayment lower during the nominated period because you are not paying down the loan balance. This can improve cash flow and, depending on your tax position, maximise your deductible interest.

Once the interest-only period ends, your loan reverts to principal and interest unless you apply for an extension. Your repayment increases because you are now reducing the loan balance with each payment. Planning for that reversion matters, especially if your property is neutrally or negatively geared. If you are on a fixed rate when the interest-only term expires, your loan may revert to principal and interest at the fixed rate, or it may revert to variable depending on your loan contract. Check the terms before you lock in.

What changed with negative gearing and CGT from mid-2026

From the 2027-28 income year, losses from established residential investment properties acquired after 12 May 2026 can only be offset against income from other residential properties, not against salary or wages. Losses can still be carried forward and used in future years. New build properties remain exempt and continue to allow full negative gearing.

For capital gains tax, the 50 per cent discount still applies to gains accruing before 1 July 2027. From that date, gains on affected properties are calculated using cost base indexation and taxed at a minimum 30 per cent rate on real gains. Properties held before 1 July 2027 are taxed under a split method depending on when the gain accrued. Eligible new builds retain access to both the existing discount and the new indexed treatment, with the choice available at the time of sale.

These rules apply to the property itself, not the loan type. But they do affect the after-tax return on an investment, which in turn influences borrowing capacity and how much debt an investor can comfortably service. If your property no longer delivers a tax offset against wage income, your cash flow needs to carry the full holding cost. That makes loan structure more important, not less.

Refinancing between loan types as your strategy shifts

Your investment loan does not need to stay in the same structure forever. You can refinance from variable to fixed, fixed to variable, or into a split as your circumstances and the rate environment change.

Refinancing during a fixed term triggers break costs, so timing matters. If you are approaching the end of a fixed period, most lenders allow you to refix, switch to variable, or move to another lender without penalty. If you are still midway through a fixed term and rates have risen since you locked in, break costs are usually minimal or even zero because the lender has not suffered a funding loss. If rates have fallen, break costs can be substantial.

We regularly see investors move from variable to split structures once they have built a portfolio of two or three properties. The split gives them room to draw on equity from the variable portion while keeping a portion of their debt stable. Others refinance from fixed to variable after a few years to regain access to offset or to consolidate debt as portfolio income improves.

Loan structure should follow strategy, not the other way around. If your needs shift, your loan can shift with them.

Making the decision without overcomplicating it

You do not need to predict rate movements perfectly. You need to know what you value more right now: certainty or access.

If you want stable repayments and are prepared to accept restrictions on offset and additional repayments, a fixed rate makes sense. If you want full control over your loan and the ability to move quickly when opportunities appear, variable works. If you want some of both, split the loan and take partial exposure to each.

Start with your cash flow position and your next likely move. If you are planning to buy again within two years, keep as much as possible on variable to preserve access to redraw and equity release. If your rental income only just covers the loan and you cannot absorb a rate rise, fix enough to protect your position. If you are holding long term and want to smooth out volatility without losing flexibility, a 50/50 split is a common middle ground.

Call one of our team or book an appointment at a time that works for you. We will walk through your current position, your investment timeline, and the loan structure that fits both.

Frequently Asked Questions