You fixed your rate to feel safe. Now a better deal is staring at you from the other side of the fence — and a break cost stands between you and it. Most borrowers assume that number is a penalty. Something the bank charges to punish you for leaving.
It's not. Break costs aren't a penalty. They're maths. And once you understand the maths, you can work out whether paying the cost still leaves you ahead.
Why Break Costs Exist
When you lock in a fixed rate, your lender doesn't just promise you that rate out of goodwill. They go to the wholesale market and lock in funding at a matching rate for the same term. Think of it like pre-buying fuel at a set price — the lender has already committed.
If you break the deal early, the lender may be stuck with funding they no longer need — at a rate that no longer matches the market. The break cost covers that gap. It's not profit. Under ASIC's Regulatory Guide 220, lenders can only recover their actual loss from the rate mismatch. They can't charge you for lost future profit, marketing costs, or anything unrelated to the funding shortfall.
That's an important distinction. It means break costs are regulated, calculable, and sometimes surprisingly low.
How the Number Is Calculated
Every lender's formula differs slightly, but the core logic is the same. Three inputs drive the calculation:
The interest rate difference — the gap between your fixed rate and the lender's current wholesale rate for the remaining term. If you fixed at 5.49% and wholesale rates for your remaining term are now 4.50%, the gap is 0.99%.
Your remaining loan balance — the principal you still owe.
The time left on your fixed term — measured in months or years.
The simplified version: Rate difference × Loan balance × Time remaining = Break cost estimate.
A borrower with an $800,000 balance, a 0.99% rate gap, and 18 months left might face a break cost around $11,880. That sounds steep — until you compare it to 18 months of overpaying.
When break costs are low (or zero)
Here's what most borrowers don't realise: break costs can shrink to almost nothing — or even zero — if wholesale rates have risen since you fixed. The lender hasn't lost anything. In fact, they may be able to re-lend your funds at a higher rate.
After the RBA's rate rises in February, March and May 2026 (taking the cash rate to 4.35%), some borrowers who fixed in late 2024 or early 2025 at lower rates discovered their break cost was minimal. Wholesale rates had moved above their fixed rate, collapsing the gap.
The takeaway: Don't assume your break cost is large. Ask for the actual number. It might surprise you.
Break Costs vs Other Exit Fees
Break costs are the big variable. But they're not the only cost of leaving a fixed loan. Here's the full picture:
| Fee | Typical range | When it applies |
|---|---|---|
| Break cost | $0–$30,000+ | Only on fixed loans; depends on rate gap and remaining term |
| Discharge fee | $150–$400 | Closing your loan with the current lender |
| Settlement fee (new lender) | $0–$300 | Some lenders charge; many waive it |
| Government fees | $150–$300 | Mortgage registration/discharge (varies by state) |
The break cost is the only one that swings wildly. The rest are predictable and small. A broker can get your exact break cost from the lender before you commit to anything — no application required, no credit enquiry triggered.
Same Borrower. Two Paths.
Meet Sarah. She's a pharmacist earning $115,000 who fixed $650,000 at 5.89% for three years in March 2025. With 22 months remaining on her fixed term, variable rates have shifted since she locked in, and she's wondering whether to ride out the fix or break early.
Her lender quotes a break cost of $5,720.
Path A — Stay on the fixed rate
Sarah keeps paying 5.89% for the remaining 22 months.
| Factor | Value |
|---|---|
| Current fixed rate | 5.89% |
| Monthly repayment (P&I, 28 years remaining) | ~$3,870 |
| Total repayments over 22 months | ~$85,140 |
| Break cost | $0 |
| Total cost over 22 months | ~$85,140 |
After the fix expires, she rolls onto the lender's SVR — likely north of 7%. She'll need to refinance at that point anyway.
Path B — Break early and refinance now
Sarah pays the $5,720 break cost and refinances to a competitive variable rate of 5.64% through a lender matched via the Wity Borrowing Power Assessment.
| Factor | Value |
|---|---|
| New variable rate | 5.64% |
| Monthly repayment (P&I, 28 years remaining) | ~$3,770 |
| Monthly saving vs fixed | ~$100 |
| Total repayments over 22 months | ~$82,940 |
| Break cost paid | $5,720 |
| Total cost over 22 months | ~$88,660 |
Wait — Path B costs more over the 22 months? Yes, because the break cost outweighs the monthly savings in this scenario.
But here's what changes the maths
Path A has a hidden cliff. When Sarah's fix expires in 22 months, she rolls onto an SVR — likely 7.05% or higher. If she doesn't refinance immediately at expiry, those extra months at SVR erode her savings fast. Every month on SVR costs her roughly $430 more than the new variable rate.
Path B eliminates that risk entirely. She's already on a competitive rate. No cliff. No urgency. No last-minute scramble.
The real comparison isn't "22 months of fixed vs 22 months of variable." It's "fixed + SVR tail risk vs variable from day one."
If Sarah delays refinancing by even three months after her fix expires, the SVR overpayment ($1,290) nearly closes the gap. Six months of SVR delay and Path B wins outright.
Break-even point: If Sarah would take longer than ~8 weeks to refinance after her fix expires, breaking now is the better financial move — even after paying the $5,720.
Based on typical scenarios. Individual outcomes vary.
Five Questions to Ask Before You Break
Not every fixed loan is worth breaking. Before you decide, get answers to these five:
1. What's my actual break cost right now? Don't guess. Ask your lender for the exact figure. It changes daily as wholesale rates move. A number that was $12,000 last month might be $7,000 today.
2. What rate could I get if I refinanced? The break cost only matters relative to the savings. If the best available rate is only 0.10% below your fix, breaking rarely makes sense. If the gap is 0.50%+, it's worth modelling.
3. How long is left on my fixed term? The shorter the remaining term, the less time you have to recoup the break cost through savings. Generally, breaking with less than 6 months left rarely pays off — you're better off waiting and refinancing at expiry. Read: What happens when your fixed rate expires →
4. What's the SVR I'll roll onto if I wait? This is the number most borrowers forget. Your lender's SVR is the rate you'll pay after the fix expires if you don't act. Most SVRs sit 1.5–2.5% above competitive variable rates. That gap matters. Read: Should you refinance your home loan? →
5. Are there other barriers to refinancing? Break costs aren't the only thing to consider. If your LVR has risen above 80%, or your income has changed, a new lender might decline you — regardless of whether you break your fix. A broker who models across multiple lenders can flag these issues before you commit. Read: Mortgage prison — how to escape →
When Breaking Almost Always Makes Sense
Three situations where the maths overwhelmingly favours breaking:
Rates have risen since you fixed. Your break cost may be close to zero. You're not paying to leave — you're just leaving. If a better product or structure exists elsewhere, the only cost is a discharge fee.
You're selling the property. If you're selling anyway — relocation, upsizing, downsizing — the break cost is unavoidable. Factor it into your sale budget and move on. Doctors relocating for fellowship positions or registrars moving between hospital rotations often face this. It's a career cost, not a financial mistake.
Your current loan structure is hurting you. Sometimes the fixed rate isn't the problem — the loan structure is. No offset account. No redraw. A split that doesn't match your cash flow. Breaking to restructure can unlock savings that dwarf the break cost itself.
What To Do Next
Break costs feel like a wall. In reality, they're a number — and numbers can be modelled.
If you're on a fixed rate and wondering whether to stay or go, the first step is getting the actual break cost from your lender. The second step is comparing it against what you'd save by refinancing.
Not sure whether the maths works in your favour? Book a 15-minute call → and we'll model the break-even calculation across 45+ lenders. No credit check. No obligation. Just a clear picture of what staying costs versus what leaving costs.
Already past your fixed term and stuck on SVR? Start here: Fixed vs variable — which is right for you? →
Worried that a new lender won't approve you? That's a different problem — and it has solutions: How to negotiate your home loan rate →
Sources:
- ASIC: RG 220 — Early Termination Fees for Residential Loans — break costs must reflect lender's actual loss, not lost profit
- Moneysmart: Break Fee Definition — ASIC's consumer guide on break fees
- Moneysmart: Switching Home Loans — costs involved in refinancing
- RBA: Cash Rate Target — cash rate 4.35% after the February, March and May 2026 rises