How to Pick Fixed, Variable or Split Investment Loans

The rate structure you pick for an investment loan shapes what you can do with the property and how much you pay when circumstances change.

Variable, fixed and split loans all work for investment property, but each one locks you into different outcomes when you need to refinance, sell or use equity. Builders who understand the practical difference between these structures can match the loan to the asset instead of guessing.

Variable Rate Investment Loans: When Flexibility Costs More Upfront

A variable rate loan charges whatever the lender's current investment rate happens to be, which means your repayments move with the market. The upside is full access to extra repayments, redraw, and offset accounts without penalty.

In our experience, builders often pick variable rates when they plan to use equity within a few years. Consider a builder who purchases a unit as a long-term hold but expects to release equity in two years to fund the next deposit. A variable rate loan allows that refinance or top-up without break costs, and any rental income above the loan repayment can sit in an offset account reducing interest while staying accessible.

Variable rates also suit properties where the rental income fluctuates. Body corporate levies, unexpected maintenance and vacancy periods mean your cash position changes quarter to quarter. A variable loan with an offset account gives you somewhere to park surplus income when the property performs well, then draw it back when a tenant leaves or a hot water system fails. You're not locked into a fixed repayment that assumes steady rental income for three years.

From 1 July 2027, new investment purchases that aren't eligible new builds will have rental losses quarantined under the negative gearing changes. That means you can't offset those losses against your building income until you sell or the property turns a profit. A variable rate loan keeps your options open if you need to sell or restructure before the tax position improves.

Fixed Rate Investment Loans: Locking in Certainty and Locking Out Changes

A fixed rate loan holds your interest rate steady for a set term, typically one to five years. Your repayment amount doesn't change regardless of what the Reserve Bank does, which makes budgeting straightforward.

The catch is that most lenders don't allow offset accounts on fixed rate investment loans, and extra repayments are capped at around $10,000 to $30,000 per year depending on the lender. If you try to pay out the loan early, refinance, or release equity during the fixed period, you'll pay break costs calculated on the lender's funding cost difference.

Fixed rates suit builders who want a set-and-forget loan on a property they plan to hold without touching. If you're buying a house in an established suburb with stable rental demand and you don't need to access the equity for at least three years, a fixed rate removes the variable of rising repayments from your cash flow.

One scenario we regularly see is a builder who fixes a rate just before finishing a large project, expecting income to drop while they line up the next job. The fixed repayment amount doesn't shift even if variable rates climb, which keeps the holding cost predictable when cash flow is uncertain. But if that same builder wants to sell the property 18 months into a three-year fixed term because the market's moved or they need the capital elsewhere, break costs can easily run into five figures.

You also need to watch what happens at the end of the fixed period. Most loans revert to the lender's standard variable rate, which is usually higher than the discounted rate offered to new customers. If you don't refinance or renegotiate before the fixed term expires, you'll pay more than you need to.

Split Rate Investment Loans: Dividing the Loan to Get Both Structures

A split loan divides your borrowing into two portions, one fixed and one variable, each with its own rate and features. The split can be any percentage you choose, though 50/50 is common.

The variable portion keeps full redraw and offset access, so you can park surplus income there and reduce interest on that part of the loan. The fixed portion gives you a stable repayment on the other half, which smooths out your cash flow if rates move. If you need to refinance or sell, you'll only pay break costs on the fixed portion, and the variable portion can be paid out or restructured without penalty.

We regularly see builders use a split structure when they're holding the property long-term but expect to access equity within a few years. For example, a builder purchases a townhouse and plans to release equity in three years to fund a second purchase. They fix 50 per cent of the loan for three years to stabilise half the repayment, and leave the other 50 per cent variable with an offset account attached. Rental income above the minimum repayment sits in the offset, reducing interest on the variable portion. When year three arrives, they refinance the fixed portion without penalty because the term has ended, and they top up the variable portion to release equity. No break costs, no waiting, and they've had partial rate protection the whole time.

The downside is that you're managing two loan accounts, each with separate interest calculations and statements. Some lenders charge two sets of fees, though many waive the second account fee if both portions are with the same lender. And because the fixed portion doesn't allow an offset, you're only getting the offset benefit on part of the loan.

Interest Only Versus Principal and Interest on Investment Loans

Most investment loan products let you choose between interest-only repayments and principal-and-interest repayments, regardless of whether the rate is fixed or variable. Interest-only loans require you to pay only the interest charged each month, which keeps the repayment amount lower and maximises your deductible interest over time. Principal-and-interest loans require you to pay down the loan balance as well, which reduces the debt but also reduces the tax deduction.

Builders often pick interest-only terms on investment loans because the interest is tax deductible and paying down the principal doesn't deliver a tax benefit. The lower repayment amount also improves cash flow, which matters when you're holding multiple properties or managing lumpy trade income. Most lenders allow interest-only terms of up to five years on investment loans, after which the loan converts to principal and interest unless you apply to extend.

From a debt recycling perspective, paying down non-deductible debt on your own home while keeping investment debt interest-only is usually the better play. But that depends on your overall tax position and what you're doing with the cash flow difference.

Choosing the Structure That Matches Your Hold Period

The right rate structure depends on how long you plan to hold the property and whether you'll need to access equity or sell before then. If you're holding long-term without needing to touch the loan, a fixed rate delivers stable repayments. If you expect to refinance, sell, or release equity within a few years, a variable rate avoids break costs. If you want partial stability without locking yourself in completely, a split gives you both.

Under the new negative gearing rules, properties acquired from 12 May 2026 that aren't eligible new builds will have rental losses quarantined from 1 July 2027. That changes the tax benefit of holding a negatively geared property, which may shorten your intended hold period. A variable or split structure keeps your options open if the tax position makes selling more attractive than you originally planned.

Don't pick a loan structure based on what the rate is today. Pick it based on what you'll need to do with the property over the next few years, then find the rate that fits that plan. Refinancing later to fix a structure mismatch costs time and money, and sometimes it's not possible without paying a penalty.

Call one of our team or book an appointment at a time that works for you. We'll walk through your hold period, your equity plans, and the loan structures that match what you're actually building.

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