Choosing between a fixed and a variable home loan rate is one of the bigger decisions you will make when buying a home in Perth. There is no single right answer. The best structure depends on your budget, your appetite for risk, and how much flexibility you want over the life of the loan. This guide walks through the main options so you can weigh them up with confidence.
What “fixed” and “variable” actually mean
A variable rate moves over time. When the cost of money in the broader economy changes, your interest rate (and usually your repayment) can rise or fall. A fixed rate is locked in for an agreed term, so your rate stays the same for that period regardless of what happens in the market.
Both are usually structured as P&I (principal and interest), where each repayment chips away at the amount you borrowed as well as the interest charged. Some buyers use interest-only arrangements, but for owner-occupiers in Perth, P&I is the most common path to owning the home outright.
If you want to understand how much you might borrow before comparing rate types, our guide on how much you can borrow is a useful starting point.
How the RBA influences variable rates
The biggest single influence on variable rates is the RBA (the Reserve Bank of Australia, which sets the cash rate). The cash rate is the baseline interest rate for the economy. When the RBA lifts the cash rate, lenders generally pass on some or all of that increase to variable home loan customers, and repayments tend to rise. When the cash rate falls, variable rates often follow, and repayments can ease.
Lenders are not obliged to move in lockstep with the RBA. Funding costs, competition and a lender’s own commercial decisions all play a part. Still, the cash rate is the headline number to watch if you are on a variable loan, because it sets the broad direction.
Fixed rates: certainty for a set term
Fixed-rate loans in Australia are typically offered over terms of one to five years. The appeal is simple. Your rate and repayment are known in advance, which makes household budgeting far easier and protects you if the RBA raises the cash rate during your fixed period.
Pros of fixing
- Repayment certainty. Your repayment will not change for the fixed term, even if rates climb.
- Protection against rate rises. If the cash rate goes up, you are insulated until your fixed term ends.
- Easier budgeting. Predictable repayments suit households with tight or fixed incomes.
Cons of fixing
- Less flexibility. Fixed loans often cap or restrict extra repayments, and many do not include an offset account or full redraw.
- Break costs. If you repay the loan early, refinance, or sell during the fixed term, the lender may charge a break cost. This can be significant when market rates have fallen since you fixed, so it pays to understand the exposure before you commit.
- You miss out if rates fall. If the RBA cuts the cash rate, you stay on your higher fixed rate until the term ends.
Fixing tends to suit buyers who value predictability above all, who are budgeting carefully, or who simply want to sleep easier knowing exactly what they owe each month.
Variable rates: flexibility and features
Variable loans move with the market, but they usually come with more features and freedom. This is where you most often find an offset account (a savings account linked to your loan that reduces the interest charged), a generous redraw facility (the ability to pull back any extra repayments you have made), and the freedom to make unlimited extra repayments.
Pros of variable
- More features. Offset accounts, redraw and flexible repayments are common.
- Extra repayments. Pay down your loan faster without penalty, which can save a lot of interest over time.
- You benefit if rates fall. When the cash rate drops, your repayments can reduce.
- Easier to refinance. Switching lenders is generally simpler with no fixed-term break cost to worry about.
Cons of variable
- Uncertainty. Your repayment can rise if the RBA lifts the cash rate, which makes long-term budgeting harder.
- Exposure to rate rises. In a rising-rate environment, your costs can increase, sometimes several times in a year.
Variable rates often suit buyers who want flexibility, who plan to make extra repayments, who may sell or refinance in the medium term, or who are comfortable riding the ups and downs of the market.
Split loans: a bit of both
You do not have to choose only one. A split loan lets you fix part of your loan and keep the rest variable. For example, you might fix 60 per cent for repayment certainty and leave 40 per cent variable so you can use an offset account and make extra repayments on that portion.
Splitting is a sensible middle ground for buyers who are torn. It softens the blow of rate rises on the fixed portion while keeping some flexibility on the variable portion. The right split depends on your goals, so it is worth talking through the numbers with a professional.
Offset accounts and why they matter
An offset account deserves special attention because it can quietly save you thousands. The balance in your offset account is subtracted from your loan balance before interest is calculated. If you owe $500,000 and hold $30,000 in an offset, you are only charged interest on $470,000.
Unlike paying extra directly onto the loan, the money in an offset stays accessible, so it can double as your emergency fund or savings buffer. Offsets are most commonly attached to variable loans, which is one reason many borrowers favour variable or split structures even when fixed rates look attractive on paper.
A note on comparing rates
When you compare loans, look beyond the headline rate to the comparison rate, which bundles the interest rate with most standard fees to give a more realistic cost. As an illustration only, a hypothetical loan might advertise a 5.99 per cent rate with a 6.10 per cent comparison rate. These are example figures, not current market rates.
Comparison rates are based on a loan amount of $150,000 over 25 years. WARNING: This comparison rate applies only to the example given. Different amounts and terms will result in different comparison rates.
Which one suits you?
Here is a quick way to think about it:
- Choose fixed if certainty matters most, your budget is tight, or you are worried about rate rises.
- Choose variable if you want features like offset and redraw, plan to make extra repayments, or may refinance or sell.
- Choose a split if you want a balance of certainty and flexibility.
There is no universally correct choice. The right answer changes with your circumstances, the economic outlook, and the deals available across the lender market at the time you apply.
If you already have a loan and your fixed term is ending, or your variable rate no longer feels competitive, it may be time to review your options. Our guide on when to refinance covers the signs to watch for, and our refinancing service explains how the process works.
How we can help
This site is not a licensed broker and does not provide credit advice. Experienced, accredited MFAA or FBAA mortgage brokers compare products from 100 or more lenders. They can model fixed, variable and split scenarios against your real numbers and recommend a structure that fits your goals.
Ready to compare your options? find a Perth broker and let an accredited professional do the legwork. You can also explore our home loans service to see how we support buyers across every stage. When you are set, reach out through our contact page and we will introduce you to a broker who can help.
Last updated 2026-06-26.
This information is general in nature and does not take into account your personal circumstances, objectives or needs. It is not financial or credit advice. Figures are current as at June 2026 and may change. Seek independent advice before acting. Perth Home Loan Broker is an enquiry website; licensed mortgage brokers provide all credit advice under the National Consumer Credit Protection Act 2009.