Fixed or variable: compare the loan with your next few years.
A fixed rate gives rate certainty for an agreed period. A variable rate can change, so repayments and costs may change too. The useful comparison includes your budget, planned extra payments and the possibility of selling or refinancing. Test several rate scenarios and read the restrictions on each actual offer. There is no universal winner, and a forecast about the next rate move cannot settle the whole decision.
By Ratey · General information for Australian borrowers.
Example: certainty has a measurable price
Imagine hypothetical offers of 5.8% fixed and 6.0% variable on a constant $500,000 balance. If the variable rate stayed at 6.0% for a year, the interest difference would be $1,000 before fees. If it were 5.5% for that entire year instead, it would be $1,500 cheaper than the fixed case.
Actual rates can change within the year and principal repayments reduce balances. The example shows why the answer depends on the path of rates, while your need for predictable payments and flexibility can be assessed now.
Start with what needs to stay predictable
Write down the mortgage payment your household can cover alongside essential expenses and a practical cash buffer. Then identify periods when income may be lower or costs higher. This gives the rate decision a specific purpose: managing a defined budget during a defined period.
Moneysmart explains that a fixed rate applies for a set period, while a lender can change a variable rate. Fixing therefore changes exposure to rate movements during that period. It does not remove other costs of owning a home.
Put actual offers in the same worksheet
Use the same loan amount, remaining term and repayment type. Record the offered rate, fees, scheduled payment and any conditions you expect to use. For a fixed offer, record the fixed end date. A two-year rate should not be treated as though it applies for the next twenty-five years.
A lower scheduled payment is useful cash-flow information, but check why it is lower. A longer term or an interest-only period changes the comparison. Keep those changes visible so the rate choice does not quietly become a different borrowing arrangement.
| Your question | What to obtain |
|---|---|
| Can I budget for it? | Payment now and payments under higher rates |
| Can I pay extra? | Extra repayment allowance and charges |
| Can I leave early? | Break-cost and discharge information |
| Can my savings help? | Offset eligibility and cost |
| What happens next? | Fixed expiry and revert arrangements |
Compare three possible variable-rate paths
Use an unchanged-rate case, a higher-rate case and a lower-rate case over the same comparison period. Label these as scenarios. You can then see how much a particular fixed offer would cost or save in each case without claiming to know which path will occur.
For a first illustration, hold a $500,000 balance constant. A one percentage-point change means a $5,000 annual interest difference on the full balance, or about $417 per month of interest. That is not the change in an amortising repayment: calculate repayments separately using the remaining term.
Match restrictions to your plans
List any likely sale, refinance, inheritance, bonus payment or substantial savings withdrawal during the fixed period. Ask the lender how each event would be handled. Break costs can matter when leaving or making certain early repayments on a fixed loan; obtain a current quote before acting.
Product details differ. ANZ’s split-loan information, for example, describes different features on its variable and fixed portions and warns that early repayment costs can change. Treat that as a reason to inspect your own contract, not as a rule that every lender has identical features.
Set an expiry review date
For a fixed offer, note when to request the next set of options and which rate applies if you do nothing. Ask whether changing products affects linked accounts or payment instructions. Review the full remaining term at that point, as well as the next monthly repayment.
If you want part of the debt fixed and part variable, compare a split as a third option. Decide what each portion is meant to achieve before choosing a percentage. A round 50/50 allocation is easy to describe but does not explain why it fits the cash you expect to hold.
Your next-step checklist
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Common questions
Is fixing a bet that rates will rise?
It can also be a budgeting choice. Assess the cost and restrictions of certainty even if future rates remain uncertain.
Do variable rates always follow the cash rate exactly?
No. Moneysmart notes that lenders decide changes and may respond to factors beyond the cash rate.
Does a fixed loan always prohibit offsets?
No universal rule applies. Check the specific product, eligible fixed period and offset conditions rather than assuming availability or exclusion.
Sources and assumptions
These primary sources support the explanations above. Examples use invented figures to show the calculation or decision; they are not available loan offers. Check your lender’s terms for your circumstances.
Calculations are estimates and do not establish borrowing eligibility. Read the calculation methodology.
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