Fixed vs Variable vs Split Home Loans: Which Should You Choose?
The real trade-offs between fixed, variable and split home loans, the RBA data on the COVID fixed-rate wave, break costs, and which suits which borrower.
By Timothy Hirou GaschereauPublished 8 min read
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The fixed-vs-variable decision gets treated as a coin flip on where interest rates are headed, but the real trade-offs run deeper than that, and a third option quietly avoids having to pick a side entirely. This is part of a wider guide to property and debt on Snowball Invest.
Quick answer
A fixed rate locks in your interest rate and repayments for a set period, insulating you from rate rises but missing out if rates fall, and typically limiting features like offset accounts. A variable rate moves with the market and keeps full flexibility, including extra repayments without penalty. A split loan lets you fix part of the loan and keep the rest variable, a genuine middle ground rather than an all-or-nothing choice.
In this guide
- →The basic trade-offs, and what actually happened when so many Australians fixed during COVID
- →Break costs, the real financial risk attached to a fixed loan
- →A second, less obvious risk: being unable to refinance off a fixed rate at all
- →Split loans as a genuine middle ground
- →Which option actually suits your own situation
⚖️ The basic difference
| Fixed rate | Variable rate | |
|---|---|---|
| Repayments | Stay the same for the fixed term | Move with the lender's rate changes |
| If rates rise | Protected during the fixed term | Repayments increase |
| If rates fall | Miss out during the fixed term | Repayments decrease |
| Extra repayments | Often capped, may incur fees | Usually unlimited |
| Offset account | Rarely available, or limited | Commonly available |
| Switching lenders | Break costs may apply | Generally no exit penalty |
📉 Why so many Australians fixed during COVID (and what happened next)
The share of Australian home loans on a fixed rate isn't static, and the pandemic period shows how dramatically it can swing. According to the Reserve Bank of Australia, fixed-rate loans made up around 20% of outstanding housing credit in early 2020, then surged to nearly 40% by early 2022, with fixed rates accounting for close to half of all new loans written in mid-2021, as lenders offered fixed rates below 2% and borrowers rushed to lock them in.
That fixed-rate wave created a well-documented "mortgage cliff" as those ultra-low rates expired in 2023 and 2024, borrowers rolling off a sub-2% fixed rate onto a much higher variable rate all at once. It's a useful reminder that a fixed rate doesn't remove interest rate risk, it just delays and concentrates it to a specific expiry date.
💰 Break costs, the real risk with fixed loans
Ending a fixed rate loan early, to refinance, sell, or switch to variable, can trigger a break cost, calculated based on the difference between your fixed rate and current market rates for the remaining term. In a falling rate environment, this can run into the thousands of dollars, since the bank is compensating for the difference between what you agreed to pay and what it could now lend that money out at instead. Variable loans written since mid-2011 carry no equivalent exit penalty.
🔒 "Mortgage prison": the risk that isn't about the rate at all
🎯 The essential: A large share of borrowers coming off a fixed rate can't refinance to a cheaper deal, not because they can't afford it, but because of a lending rule unrelated to their actual repayment history.
There's a second risk from the fixed-rate wave described above, separate from the rate itself. Australian lenders are required by APRA to test whether a borrower could still afford a new loan at their actual interest rate plus a buffer of at least 3 percentage points, a rule designed to make sure borrowers can absorb future rate rises. That buffer applies to refinancing, not just new purchases, which creates a genuine trap: someone who fixed at a very low COVID-era rate and has never missed a repayment can still fail the serviceability test at a competitor bank simply because current rates, plus the 3% buffer, push the test rate too high relative to their income, even though their existing lender is happily letting them keep paying the same loan.
This bind is widely referred to as "mortgage prison." An industry survey of mortgage brokers by the Mortgage & Finance Association of Australia found that a clear majority pointed to serviceability, not credit history or property value, as the primary reason clients couldn't refinance in the period after the mortgage cliff hit. Industry bodies have lobbied APRA to soften the buffer for straight refinances, but APRA has held the line, judging the buffer necessary for system-wide stability even though it strands some individual borrowers with their existing lender. It's a genuine reason to weigh, before fixing, how easily you'd actually be able to leave that lender later if rates move against you, not just what the fixed rate costs today.
🔀 Split loans: a bit of both
A split loan divides the balance into a fixed portion and a variable portion, in whatever ratio suits, commonly close to even. The fixed portion gives certainty over part of the repayment, the variable portion keeps access to an offset account and unlimited extra repayments on that share of the loan. It's a genuine hedge, rather than betting the entire loan on picking the right direction for interest rates.
🏠 Real Loan Cost Calculator
Compare the total interest cost under different rate scenarios.
🧭 Which actually suits you
A fixed rate suits anyone who values certainty over their budget above all else, particularly if cash flow is tight enough that a rate rise would genuinely strain repayments. A variable rate suits anyone likely to make extra repayments, wanting an offset account, or who might refinance or sell within the fixed term and wants to avoid break costs. A split loan suits anyone who wants a partial hedge without committing the whole loan either way, a reasonable default for a lot of borrowers who genuinely don't have a strong view on where rates are headed next.
Whichever way you land, it's worth weighing against how much borrowing capacity and housing affordability actually look like in the current market before locking anything in.
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❓ Frequently asked questions
Can I switch from fixed to variable whenever I want?
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Yes, but breaking a fixed rate before the term ends usually triggers a break cost, which can run into the thousands of dollars, especially if rates have fallen since you fixed. It's not blocked, it's just often expensive.
Do fixed rate loans have offset accounts?
+
Rarely, and if they do, it's often a limited or partial offset. Full offset accounts are a variable-loan feature in most cases, one of the trade-offs of locking in a fixed rate.
Is a split loan more expensive to set up than a single loan type?
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Not usually, most lenders offer split loans as a standard product option rather than charging extra just for the split, though it's worth confirming with your specific lender.
What percentage of Australians currently have a fixed rate home loan?
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A small minority. After peaking at close to 40% of outstanding housing credit in early 2022, largely from ultra-low COVID-era fixed rates, the fixed-rate share has fallen sharply as those loans rolled off, with variable loans now making up the large majority of both new and existing lending.
📚 Recommended reading
The Barefoot Investor
Scott Pape
Australia's best-selling money book ever. A simple system for accounts, budgeting, debt and a real emergency fund in one.
Some links above are affiliate links. If you buy through them, Snowball Invest may earn a small commission at no extra cost to you. We only recommend books we'd suggest anyway.
Sources
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Timothy Hirou Gaschereau
Founder of Snowball Invest, not a financial adviser.
I write about what I'm learning myself, because nobody ever taught us how to take control of our own money. It's a skill, not a mystery, and it's never too late to learn it. The best day to start was yesterday, the second best is today.
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