Fixed Rate Mortgage vs Variable: Broker Guide

A fixed rate mortgage suits a borrower who wants repayment certainty during a defined period and can accept the product’s limits. A variable home loan suits someone who needs flexible repayments or access to savings and can afford repayment changes. Consider a split when those priorities coexist.

For a broker, the deciding question is whether the structure fits the client’s budget and plans. A prediction about the next rate move doesn’t answer that question.

What Changes When a Rate is Fixed

A fixed rate home loan holds the contracted interest rate for a set period, then normally moves to the applicable variable rate unless another arrangement is agreed. During that period, extra-payment limits and access to offset or redraw can differ from a variable product. The fixed rate protects against rate rises and prevents the borrower benefiting automatically from rate falls.

A variable rate mortgage has an interest rate the lender can change under the contract. Repayments can rise or fall when that rate changes. Moneysmart’s fixed and variable comparison explains the difference and the effect of each structure on flexibility.

Fixing the interest rate doesn’t freeze every charge or condition. A fee, an agreed repayment change or the expiry of a separate interest-only period can affect the amount the borrower pays. Distinguish the interest rate from the required repayment and the total amount debited.

How Rate Movements Affect Repayments

This fictional calculation compares the same $600,000 balance over 30 years with monthly principal and interest repayments. It excludes fees and offset balances, and assumes each illustrated rate applies for the calculation. The rates are assumptions, not lender quotes or forecasts.

Assumed annual interest rate	Calculated monthly repayment	Difference from 6%
5%	$3,221	$376 lower
6%	$3,597	Baseline
7%	$3,992	$395 higher

A loan fixed at 6% keeps that rate during its fixed period if the agreed structure stays unchanged. A variable loan moving from 6% to 7% would require about $395 more each month on these starting assumptions. Actual recalculations use the balance and remaining term when the change takes effect.

Use the client’s proposed repayment type and remaining term for the real comparison. An interest-only repayment covers interest without reducing principal, so it can’t be compared with a principal and interest payment as if both repay debt equally.

Compare Features on the Same Loan

Compare fixed and variable products with the same balance, remaining term and borrower objective, then price the features the client will use. For this comparison, assume a $600,000 owner-occupied loan over 30 years with principal and interest repayments. The borrower wants to reduce interest while keeping emergency savings accessible.

An offset account is a separate deposit account whose eligible balance reduces the loan balance used to calculate interest. Redraw gives access to eligible extra repayments already paid into the loan. Access rules matter because paying money into a loan doesn’t guarantee the borrower can withdraw it later.

ANZ Fixed and Standard Variable Features

Australia and New Zealand Banking Group (ANZ) publishes the following product features as at October 2026. These are conventional ANZ products, not ANZ Plus loans. The fixed product page and Standard Variable product page explain their terms.

Feature for the same borrower	ANZ Fixed Rate	ANZ Standard Variable
Extra repayments	Annual tolerance is the lesser of 5% of the starting fixed-period balance or $5,000. For this $600,000 example, it is $5,000	Additional repayments without a fee
Offset	ANZ One offset is available on the one-year fixed term for $10 a month	ANZ One offset is available for $10 a month
Redraw	Unavailable during the fixed period	Eligible extra repayments can be redrawn, subject to terms and eligibility
Ordinary loan fees	No ANZ setup or ongoing loan fees. Selected features and other applicable charges remain	No ANZ setup or ongoing loan fees. Selected features and other applicable charges remain
Later changes	Early repayment costs can apply to specified changes during the fixed period	Greater repayment flexibility, with applicable discharge and other charges still relevant

For a two-year fixed comparison, the one-year offset feature doesn’t carry across. This changes the recommendation for a borrower keeping substantial savings accessible. ANZ’s redraw rules also say principal reductions made during a fixed period aren’t available for redraw at any time.

Other Major-Bank Fixed Products

Commonwealth Bank’s Fixed Rate guide dated 14 March 2026 allows $10,000 of additional payments each fixed year. The allowance excludes Interest in Advance terms. Redraw and offset are unavailable during the fixed period, and eligible package benefits carry an annual fee.

Westpac’s Fixed Options product, as at October 2026, allows $30,000 of extra repayments across the whole fixed term. It permits redraw of available extra repayments when activated, but has no offset on the fixed loan. Its optional package costs $395 annually, and standard charges can apply without the package.

These allowances use different periods. A $10,000 yearly allowance and $30,000 across an entire fixed term aren’t interchangeable. Fixed-rate redraw also differs between lenders, so a blanket statement that fixed loans never have redraw would misdescribe these products.

Keep the feature comparison separate from the rate ranking. The lowest advertised fixed rate can still be the wrong structure if the borrower needs an unavailable feature. Obtain the loan’s Key Fact Sheet for comparable repayment assumptions and fees.

Test Certainty Against Flexibility

Test both the client’s preference for stable repayments and their financial capacity to handle higher repayments. A client can tolerate uncertainty emotionally while lacking the cash to absorb it. Another can afford a rise but value a predictable monthly commitment.

Using the fictional calculation above, a client with only $150 of monthly surplus cannot absorb a $395 increase without changing their budget. Fixing can stabilise the selected period, but it doesn’t solve unaffordable borrowing or remove the need to plan for expiry. Compare verified income and expenses, existing debts and accessible reserves before recommending the loan amount.

A Borrower Expecting Extra Savings

In this fictional example, Priya expects to save an additional $1,500 each month and wants to retain access for family expenses. That is $18,000 over a year. A product with an accessible offset or suitable redraw is more useful than a fixed product whose extra-payment allowance traps or restricts that cash.

A variable loan with offset is a strong fit for Priya if she can absorb repayment rises. A split can preserve certainty on part of the debt while keeping savings accessible against the variable portion. Compare the offset fee with the interest reduction from her likely average balance, including months when she spends the savings.

A Borrower Expecting to Sell

In this fictional example, Daniel plans to sell within 18 months. A three-year fixed period extends beyond his expected ownership, so variable lending is the stronger starting choice for flexibility. His need to change the loan outweighs certainty for a period he doesn’t expect to complete.

An existing fixed term can limit later changes. The separate guide to changing or refinancing a fixed home loan covers that decision, while break costs explains early-exit cost factors.

If a client asks, Should I fix my mortgage now?, answer from their savings plans and ability to manage repayment changes. Fix when certainty is useful and the fixed-period constraints fit. Choose variable when flexibility is needed and higher repayments remain affordable.

Decide Whether to Split the Loan

A split home loan combines fixed and variable portions when the client needs certainty and usable repayment flexibility. The fixed portion gives protection from rate movements during its agreed period. The variable portion can provide an eligible offset and room for extra repayments.

Consider a split for a client expecting savings who also wants a stable commitment on part of the debt. The variable portion must remain useful for the expected savings balance. An offset balance above the linked loan balance doesn’t offset the fixed portion automatically.

A split still leaves exposure to variable repayment rises and fixed-product constraints. Allocation and account-linking checks belong in the split home loan guide.

Record the Recommendation

Record why the selected structure meets the client’s needs and which alternatives you considered. Keep the evidence beside the recommendation so the file explains the decision at the time it was made.

• Record the fixed, variable and split options compared, using the same balance and term.
• State the client’s budget capacity and their preference for repayment certainty.
• Record expected savings, access needs and any planned sale or other loan change.
• Retain each product’s extra-payment limit, offset eligibility and redraw restrictions.
• List the fees included, the fixed expiry assumptions and any rate-lock arrangement.
• Explain why you rejected an otherwise cheaper or more flexible option.

Before settlement, update the comparison if the loan amount, property or repayment type changes. Changed income, debts or timing can also alter the client’s needs or the lender’s assessment. A changed quoted rate or product condition requires you to check whether the chosen structure still fits.

A fixed-rate quote at application doesn’t always secure the settlement rate. ANZ’s fixed product terms, as at October 2026, apply the rate at drawdown unless an applicable rate lock is arranged. Separate a proposed fixed rate from a rate actually secured under the lock terms.

For lender-policy research, Bulma’s Policy Advisor quotes the wording behind each answer, which you can retain with your file notes. Bulma doesn’t quote rates, fees or product pricing. Keep the lender’s product comparison and loan offer with the policy evidence.

Available Fixed Terms and Feature Limits

The total mortgage term is the repayment horizon, while the fixed period is the shorter interval during which the contracted rate applies. A 30-year mortgage with a two-year fixed period requires repayment over 30 years and fixes the rate for only the first two. A five-year fixed mortgage likewise doesn’t mean the entire debt must be repaid in five years.

ANZ’s fixed product page, as at October 2026, lists one to five, seven and ten-year fixed periods for principal and interest loans. Commonwealth Bank’s 14 March 2026 guide lists one to five years. Westpac’s fixed product page, as at October 2026, also lists one to five years.

A ten-year fixed period is therefore an Australian option at ANZ, subject to its product and approval terms. Thirty-year total loan terms appear in these product documents, but those terms don’t establish a thirty-year fixed rate. A search for a fifteen-year fixed rate also needs a product expressly providing that period, not a fifteen-year repayment term.

Why an Apparent Fixed Mortgage Increase Needs Diagnosis

Identify what increased before deciding whether the fixed-rate agreement was breached. Compare the previous and current statement with the loan offer and repayment schedule. Check the rate itself, the required repayment, separate fees and whether the fixed period has expired.

A higher repayment can follow a switch from interest-only to principal and interest because repayment now reduces the debt. Commonwealth Bank’s 14 March 2026 Fixed Rate guide permits this repayment-type change without treating the switch itself as a break. Its interest-only switching guide explains that the applicable fixed reference rate can also change with the scheduled repayment type.

An unchanged rate can still sit beside a higher charge. Westpac’s fixed product page, as at October 2026, lists a $15 missed-payment fee and states that standard fees can change. In a labelled fictional example, a $3,597 scheduled repayment plus a $15 missed-payment fee creates a $3,612 total charge without changing the interest rate.

That example doesn’t describe a rate rise or a new ongoing repayment. It separates the payment and fee, so the borrower knows which issue to raise. If the rate changes inside the agreed fixed period without a contractual explanation, ask the lender to explain the discrepancy against the loan offer.

Choose the fixed period that matches the client’s need for certainty and realistic plans. Record the expiry date and arrange a comparison before it ends, when the next rate and product features can change the budget.