Fixed vs Variable Mortgage 2026: Which Should You Choose?

As of March 2026, the RBA cash rate sits at 4.10% following two consecutive 25bp hikes in February and March. Variable rates for owner-occupier principal-and-interest loans range from 5.99% to 6.80%, with the average among the Big Four banks at approximately 6.45%.

The best variable rates from online lenders and credit unions sit around 5.99-6.15%. Fixed rates tell a different story. The best 1-year fixed rates range from 5.89% to 6.29%.

Two-year fixed rates are 5.79%-6.19%. Three-year fixed rates are 5.59%-5.99%. And five-year fixed rates are 5.49%-5.89%.

In plain English: Notice the inverted pattern: longer fixed terms are cheaper than shorter ones, which is cheaper than variable. This is unusual and reflects swap markets pricing in rate cuts from late 2027 onwards.

Banks set fixed rates based on swap rates (their cost of funding), not the current cash rate. When swap markets expect rates to fall, longer fixed rates drop below current variable rates. On a $600,000 loan over 25 years: the monthly repayment at 6.45% variable is $4,041.

At 5.89% fixed for 2 years, it's $3,825. At 5.59% fixed for 3 years, it's $3,700. The difference between the best 3-year fix and average variable is $341/month or $4,092/year — a meaningful saving if rates stay elevated.

Looking at 30 years of Australian mortgage data, fixing your rate was the better financial outcome approximately 35-40% of the time. That means variable won more often — but the margin was not always large, and the value of fixing extends beyond pure cost.

Fixing paid off handsomely in three clear periods. First, 2002-2004: borrowers who fixed at 5.5-6.0% before the RBA hiked from 4.25% to 5.50% saved significantly. Second, 2009-2010: those who fixed at emergency-low rates of 5.0-5.5% before the rapid hiking cycle to 4.75% cash rate locked in below-market rates for years.

The short version: Third, 2021-early 2022: borrowers who fixed at 1.89-2.50% before the aggressive hiking cycle that took rates from 0.10% to 4.35% achieved the biggest windfall in Australian mortgage history — saving $15,000-$40,000 per year compared to variable by late 2023. Fixing was a poor choice in 2011-2013 (rates fell steadily), 2015-2016 (rates continued falling), and late 2019 (rates were cut further before the pandemic emergency cuts). The pattern is clear: fixing works best when rates are about to rise and markets have not yet priced it in.

In March 2026, markets are pricing cuts — which historically suggests that variable may outperform over a 2-3 year horizon. But history is not destiny. Pretty straightforward once you know.

A split loan divides your mortgage into a fixed portion and a variable portion, giving you partial protection against rate rises while maintaining some flexibility. Common splits are 50/50, 60/40 (fixed/variable), or 70/30.

On a $600,000 loan split 60/40, you would fix $360,000 at 5.89% for 2 years (repayments: $2,295/month) and keep $240,000 variable at 6.45% (repayments: $1,616/month), for a total of $3,911/month. Compare this to fully variable ($4,041) or fully fixed ($3,825). The split gives you 60% of the rate certainty at a slightly higher cost than fully fixing.

The real advantage of a split is flexibility on the variable portion. You can make unlimited extra repayments into the variable portion, use an offset account against it, and redraw from it without penalty. The fixed portion typically limits extra repayments to $10,000-$20,000 per year and doesn't allow offset.

Real talk — For a household with irregular income (bonuses, commissions, freelance work), maintaining a variable portion with an offset account provides crucial cash flow flexibility. Most lenders allow you to set up a split at no additional cost — you simply nominate the split ratio at application or refinance.

You can change the ratio at the end of the fixed term.

Break costs are the fee charged by your lender if you exit a fixed-rate loan before the term ends — whether by refinancing, selling, or switching to variable. They can be devastatingly expensive and are the single biggest risk of fixing.

Break costs are calculated based on the difference between your fixed rate and the current wholesale rate for the remaining term, multiplied by your loan balance and remaining time. If wholesale rates have fallen since you fixed, break costs can be enormous. Example: you fixed $500,000 at 6.50% for 3 years.

After 1 year, wholesale rates for a 2-year fix have dropped to 4.50% — a 2% gap. Your approximate break cost would be $500,000 x 2% x 2 years = $20,000. In 2023-2024, borrowers who fixed at emergency-low rates in 2021 and wanted to switch actually had zero or minimal break costs because rates had risen — the bank was happy to release them.

One thing people miss: But in 2026, if you fix and rates are cut aggressively, you could face significant break costs. The key protection: never fix for a period longer than you're certain you will keep the property and the loan.

If there's any chance you will sell, renovate and refinance, or need to access equity within the fixed period, keep at least a portion variable. Some lenders offer a capped break cost product (typically 0.5-1.0% of the loan balance) for a slightly higher rate — worth investigating if certainty matters.

The RBA's forward guidance after the March 2026 meeting was deliberately ambiguous. Governor Bullock stated the Board would be 'data-dependent' — the standard phrase that means they're genuinely unsure.

Market pricing as of late March 2026 assigns a 35-40% probability to one more 25bp hike in May (to 4.35%), a 50-55% probability of a hold at 4.10% through mid-2027, and then rate cuts beginning in the second half of 2027. The median economist forecast is for the cash rate to peak at 4.10% or 4.35% and remain there until Q3 2027, with 50-75bp of cuts by the end of 2027 and a further 75-100bp in 2028. If this base case plays out, variable rates would remain around 6.20-6.80% through mid-2027, then gradually fall to 5.50-6.10% by late 2028.

Under a more pessimistic scenario (inflation stays above 3.5%), the RBA could hike to 4.60% or higher, pushing variable rates above 7.00%. Under an optimistic scenario (global recession triggers a sharp slowdown), emergency cuts could begin in late 2026. Your fixed-vs-variable decision depends heavily on which scenario you weight most.

Heads up — If you think rates are at or near their peak, variable gives you the benefit of eventual cuts. If you think there's a real risk of further hikes, fixing provides insurance.

Question one: can you absorb a further 0.50-0.75% rate rise on your variable rate? If your variable rate went from 6.45% to 7.20%, your monthly repayment on a $600K loan jumps from $4,041 to $4,353 — an extra $312/month.

If that would cause genuine financial stress, fixing provides valuable insurance. Question two: do you've an offset account with a meaningful balance? If you maintain $50,000-$100,000 or more in offset, the effective interest saving is substantial ($3,225-$6,450/year at 6.45%), and you lose this benefit on the fixed portion.

Borrowers with large offsets generally do better on variable. Question three: do you plan to sell, refinance, or renovate within the next 1-3 years? If yes, avoid fixing or keep the fixed portion small to minimise break cost risk.

Question four: do you've irregular income? If you receive bonuses, commissions, or variable freelance income, the ability to make unlimited extra repayments on variable (and redraw if needed) is valuable.

This bit matters. Consider a split. Question five: what is your stress tolerance? Some borrowers sleep better knowing exactly what their repayment will be for 2-3 years, even if they pay a small premium for that certainty.

There's genuine financial value in reduced stress and better decision-making that comes from payment certainty.

Scenario A — First home buyer, $550K loan, $40K offset, planning to stay 10+ years. Current variable rate 6.35%.

Best 3-year fix 5.69%. Monthly saving by fixing: $550K at 5.69% = $3,417 vs $3,648 variable = $231/month saved. But they lose offset benefit: $40K x 6.35% = $2,540/year effective interest saving lost.

Net annual benefit of fixing: $231 x 12 - $2,540 = -$228. Verdict: stay variable, the offset advantage outweighs the rate gap. Scenario B — Growing family, $750K loan, $15K offset, dual income at risk of parental leave.

Don't skip this part. Current variable 6.50%. Best 2-year fix 5.89%.

Monthly saving by fixing: $750K at 5.89% = $4,781 vs $5,051 variable = $270/month saved. Offset benefit lost: only $975/year. Net annual benefit: $270 x 12 - $975 = $2,265/year.

Plus income certainty during potential parental leave. Verdict: fix 60-70% for 2 years, keep 30-40% variable with offset for flexibility. Scenario C — Investor, $900K loan, interest-only, $5K offset.

Current variable 6.85%. Best 2-year fix 6.19%.

Monthly saving: $900K x (6.85%-6.19%) / 12 = $495/month. Offset benefit lost: minimal. Verdict: fix the full amount for 2 years and lock in the $5,940/year saving — investor loans have the biggest rate gap between fixed and variable right now.