Calculate the optimal split between fixed and variable portions of your home loan
Updated October 2026Built and checked by MaverickHow it's calculatedReport an error
Total monthly
$3,304
Blended rate
6.93%
weighted by split
Flexibility
Medium
$200,000 max extra repay
Fixed portion
$300,000
$2,000/month
Variable portion
$200,000
$1,304/month
Move the fixed portion slider to rebalance it: every chart updates as you go.
A split usually lands between the two extremes: the cost of certainty + flexibility.
Fixed and variable portions accrue interest separately for the whole term.
Splitting a loan puts part of it on a fixed rate and the rest on variable: some certainty on repayments, while keeping extra repayments and an offset on the variable part. Put in your loan and the split you're weighing up to see the repayments on each part.
As of 7 November 2026, the lowest variable home loan rate is 5.93%, from SCCU's BROKER HOME LOAN, while the typical best across 104 institutions is 6.38%. The lowest 3-year fixed home loan rate is 6.24%, from Credit Union SA's 3-Year Fixed 40 Year Home Loan Package, while the typical best across 80 institutions is 6.69%. The RBA cash rate is 4.85%. Those are for an owner-occupier paying principal and interest at an 80% LVR.
Lisa has a $550,000 loan, wants budget certainty but also flexibility. Fixed 5.8%, variable 6.2%.
70/30 split: $385,000 fixed at $2,259/month (stable), $165,000 variable at $1,011/month (flexible for extra payments).
Marcus earns well and can save $3,000/month extra. He has a $480,000 loan. Fixed 6.0%, variable 6.4%.
40/60 split: $192,000 fixed, $288,000 variable. Putting $36,000/year in extra payments onto the variable portion could pay it off in just under 6 years (about 71 months).