In 2023, roughly 800,000 Australians locked in fixed rates below 2%. In 2025, they rolled off to variable rates above 6%. The pain was real — monthly repayments jumped by $800 or more overnight for many households. Here's how to make the fixed vs variable decision with actual numbers, not vibes.
Everyone writes “fixed vs variable explained.” We go deeper. We model the actual dollar outcomes across different rate scenarios, explain break costs with real examples, and give you a decision framework based on your personal situation — not generic advice copied from a bank's FAQ page.
Every lender and rate in this guide is available to Australian borrowers. We update our research regularly, but rates change daily — always confirm with the lender before applying.
Where Rates Are Right Now
Australian Home Loan Rate Snapshot
RBA Cash Rate
4.10%
Avg Variable Rate
~6.2%
Avg 2-Year Fixed
~5.8%
Avg 3-Year Fixed
~5.6%
Lowest Variable
~5.89%
Athena, Ubank
Lowest 2-Year Fixed
~5.49%
Homestar, Reduce
Rates are indicative as of March 2026. Check individual lenders for current rates. Comparison rates will be higher.
The Real Cost Comparison
Let's model a $600,000 loan over 30 years — close to the median mortgage in most capital cities. Here's what each option actually costs you.
| Scenario | Rate | Monthly | Interest (5yr) | Interest (30yr) |
|---|---|---|---|---|
| Variable 6.2% | 6.20% | $3,682 | $162,900 | $725,400 |
| Fixed 2yr @ 5.8% | 5.80% | $3,531 | $155,700 | $671,160 |
| Fixed 3yr @ 5.6% | 5.60% | $3,456 | $151,200 | $644,160 |
| Split 50/50 | ~5.9% | $3,569 | $158,300 | $684,780 |
Calculations assume P&I repayments over 30 years. Actual costs depend on rate movements. General information only — not financial advice.
The 3-year fixed option saves over $81,000 in total interest compared to staying variable for the full 30 years — if rates stay at current levels. But that's a big “if.” If the RBA cuts rates significantly during your fixed period, you're locked in at the higher rate and can't benefit. That's why the decision is more nuanced than “pick the lowest number.”
Break Costs — The Hidden Trap
Break costs are the penalty for exiting a fixed-rate loan early. They can run into tens of thousands of dollars.
Break costs are what your lender charges if you exit a fixed-rate loan before the term ends. They exist because the bank locked in wholesale funding at a certain rate to match your loan — if you leave early, they lose money, and they pass that cost to you.
Real Example: Break Cost Calculation
- Loan: $600,000 fixed at 4.50%, 2 years remaining
- Current variable rate: 6.20%
- Rate difference: 1.70%
- Approximate break cost: $600,000 × 1.70% × 2 years = $20,400
Note: This is a simplified example. Actual break costs use wholesale swap rates, not retail rates, and can be higher or lower. Your lender must disclose the exact formula in your loan contract.
When break costs make sense to pay: If you can refinance to a rate low enough that the savings over the remaining term exceed the break cost. For example, if breaking costs you $10,000 but refinancing saves you $15,000 over 3 years, it's worth it mathematically. But run the numbers carefully — or ask a mortgage broker to do it for you.
Key rule: Break costs are highest when rates have fallen since you fixed. If rates have risen, break costs are often zero or near-zero. This is counterintuitive — you're penalised for leaving a “good” fixed rate, not a bad one.
The Decision Framework
Forget what the commentators say about where rates are “heading.” Nobody knows. Instead, choose based on your personal situation.
Lock in Fixed If…
- ✓ You value payment certainty above all
- ✓ Your budget is tight — you can't absorb rate rises
- ✓ You won't sell or move during the fixed period
- ✓ You don't have significant savings for an offset
Stay Variable If…
- ✓ You want offset account access
- ✓ You might sell or refinance soon
- ✓ You can absorb potential rate rises
- ✓ You want to make unlimited extra repayments
Split 50/50 If…
- ✓ You want to hedge your bets
- ✓ You want some offset access but also some certainty
- ✓ You're unsure about rate direction
- ✓ You have moderate savings ($20k–$50k)
The Offset Account Factor
This is the part most “fixed vs variable” articles skip. Offset accounts are usually only available with variable-rate loans, and they can dramatically change the maths.
How Offset Works — Real Numbers
- Loan: $600,000 at 6.2% variable
- Offset balance: $50,000
- Interest charged on: $600,000 − $50,000 = $550,000
- Annual interest saved: $50,000 × 6.2% = $3,100/year
- Effective rate: ~5.7% (equivalent to fixing at 5.7%)
If you have $100k in offset, the effective rate drops to ~5.2% — beating every fixed rate on the market. The more savings you have, the more powerful offset becomes.
The rule of thumb: If you have savings equal to 10% or more of your loan balance and you're disciplined about keeping them in the offset account, variable with offset will almost always beat fixed. If your offset balance is minimal, fixed rates give you more predictable outcomes.
Top Lenders by Type
Choosing a lender is as important as choosing a rate type. Online lenders offer the lowest rates; big banks offer the widest product range.
Our Picks
- Best variable rate: Athena, Ubank, ING — lowest rates with offset accounts. Athena automatically lowers your rate as you pay down the loan.
- Best fixed rate: Homestar, Reduce Home Loans — consistently among the lowest fixed rates in market.
- Best big bank: CBA (widest product range, best app), ANZ (competitive fixed rates). You'll pay 0.3–0.5% more for the big bank premium, but some borrowers value the branch network and product breadth.
- Best for first home buyers: Keystart (WA — 2% deposit loans), plus state-specific First Home Owner Grant schemes. Check your state government website for current incentives.
Three Things Most People Get Wrong
1. Chasing the lowest rate blindly. A 5.49% fixed rate with $1,500 in annual fees can cost more than a 5.89% variable with zero fees. Always compare using the comparison rate, which includes fees.
2. Fixing for too long. 5-year fixed rates look attractive, but you're betting on rate direction for half a decade. Most brokers recommend 2–3 year fixed terms as the sweet spot between certainty and flexibility.
3. Ignoring the revert rate. When your fixed period ends, you “revert” to the lender's standard variable rate — which is almost always higher than their advertised variable rate. Set a calendar reminder 3 months before your fixed rate expires to start comparing.
Sources: RBA — cash rate decisions and lending rates (rba.gov.au) • APRA — monthly banking statistics (apra.gov.au) • ABS — lending indicators (abs.gov.au) • Lender rates from CBA, Westpac, ANZ, NAB, Macquarie, ING, Athena, and Ubank websites, February–March 2026. This is general information only — not financial advice. Always seek independent advice before making home loan decisions. Last verified: March 2026.