How to Compare Mortgage Rates in Australia (2026)

Comparing mortgage rates sounds straightforward — find the lowest number and go with it. In practice, it's far more nuanced. As a broker, your clients rely on you to look beyond the headline rate and find the product that genuinely fits their situation.

This guide covers how to compare mortgage rates effectively, what to look out for, and how live data from the Consumer Data Right (CDR) is changing the game.

Headline rate vs comparison rate

The headline rate (or advertised rate) is the interest rate the lender promotes. It doesn't include fees, charges, or the cost of product features.

The comparison rate factors in most fees and charges over a $150,000 loan over 25 years, giving a more realistic picture of the total cost. By law, lenders must display it alongside the headline rate.

Tip for brokers: Always walk clients through both rates. A product with a low headline rate but high ongoing fees can end up costing more than a slightly higher rate with fewer charges.

Fixed vs variable — what to compare

When comparing rates, you're usually looking at three categories:

Variable rates — move with the market. Offer flexibility (extra repayments, redraw, offset) but less certainty.
Fixed rates — locked for 1–5 years. Provide repayment certainty but often come with restrictions on extra repayments and limited offset.
Split loans — part fixed, part variable. A common middle ground that gives clients partial protection from rate rises while keeping some flexibility.

The right choice depends on the client's risk tolerance, cash flow, and how long they plan to hold the loan.

What else to compare beyond the rate

Rates matter, but they're only part of the picture. When building scenarios for clients, consider:

Offset accounts — does the product offer a full offset? Partial? Multiple offsets?
Redraw facility — how accessible is it? Are there minimum redraw amounts or fees?
Extra repayment limits — especially on fixed loans, where penalties can apply.
Fee structure — application fees, ongoing fees, discharge fees, and break costs.
Loan features — portability, top-up options, and construction loan capabilities.
Cashback offers — increasingly common, but check the clawback conditions.

How CDR is changing rate comparison

The Consumer Data Right (CDR) gives authorised recipients access to standardised, machine-readable product data directly from lenders. For mortgage brokers, this means:

Real-time rates — no more manually checking lender websites or waiting for rate sheets.
Standardised data — product features, fees, and eligibility criteria in a consistent format.
Comprehensive coverage — CDR covers all ADIs (authorised deposit-taking institutions), so you get a broad market view.

Instead of relying on aggregator rate sheets that may be days or weeks old, CDR-powered tools pull live data so you're always comparing current products.

Building better client scenarios

Once you have access to live rate data, the next step is building scenarios that make sense for the client. A good scenario comparison should:

Start with the client's situation — income, expenses, existing debts, deposit, and property value.
Compare like for like — same loan amount, same LVR, same loan term across products.
Model the total cost — not just the monthly repayment, but the total interest paid over the loan term.
Show the impact of features — how much does an offset account save over 5 years? What's the cost of not being able to make extra repayments on a fixed loan?
Present options clearly — clients need to understand the trade-offs, not just see a wall of numbers.

Common mistakes when comparing rates

Ignoring fees — a 5.99% rate with $400/year in fees can cost more than 6.10% with no fees.
Comparing different LVR tiers — lenders price differently at 60%, 70%, 80%, and 90%+ LVR. Make sure you're comparing the same tier.
Not checking eligibility — the best rate means nothing if the client doesn't qualify.
Overlooking clawback — if a client refinances within 1–2 years, the lender may claw back the upfront commission. Factor this into your advice.
Using stale data — rates change frequently. If your comparison is a week old, it might already be wrong.

Making it practical

The key to effective rate comparison is having the right tools. Spreadsheets work, but they don't scale — and they go stale the moment you close them.

BrokerIQ pulls live CDR market rate data and lets you build, compare, and track scenarios per client — so you spend less time on data entry and more time on advice.

Need help getting started with rate comparison? Contact us or explore BrokerIQ to see how live CDR data fits into your workflow.