What Is a Comparison Rate — And Why Should You Care?

If you've ever looked at home loan advertising, you've probably noticed that lenders are required to display two rates side by side: the interest rate, and a second, slightly higher number labelled the "comparison rate." Most people glance at both and focus on the lower one. That's understandable — but it means missing the point of what the comparison rate is actually telling you.

Here's what it means, why it exists, and how to use it properly when evaluating a home loan.

Why the Comparison Rate Exists

Home loan pricing isn't just about the interest rate. Lenders charge a range of fees — application fees, annual package fees, monthly account-keeping fees, valuation fees — that add to the true cost of a loan over time. A lender could advertise a very sharp interest rate while quietly recovering margin through fees, making an apples-to-apples comparison between products difficult.

The comparison rate was introduced to address this. It's a standardised figure, required by law under the National Consumer Credit Protection Act, that combines the interest rate with most of the fees and charges associated with the loan — expressed as a single annual percentage rate. The intention is to give borrowers a more complete picture of what a loan actually costs.

How Is It Calculated?

The comparison rate is calculated using a standard formula applied consistently across all lenders. In Australia, it's based on a loan of $150,000 over 25 years.

Every lender uses the same benchmark, which is what makes comparison possible.

The calculation includes:

• The interest rate

• Application or establishment fees

• Ongoing monthly or annual fees

• Discharge fees at the end of the loan

  
  

It does not include fees that are conditional or variable — such as redraw fees, break costs on fixed rate loans, or fees that only apply in specific circumstances.

What the Comparison Rate Tells You

The gap between the advertised interest rate and the comparison rate is a useful signal. A large gap suggests the loan carries significant fees that are adding meaningfully to its true cost. A small gap — or no gap at all — suggests the loan is relatively fee-light.

For example:

• Loan A: Interest rate 5.99% | Comparison rate 6.02% — small gap, minimal fees

• Loan B: Interest rate 5.89% | Comparison rate 6.31% — large gap, significant fees

  
  

Loan B has a lower advertised rate, but its comparison rate is considerably higher than Loan A. Depending on your loan size and term, Loan A could actually be the cheaper product despite the higher headline rate.

What the Comparison Rate Doesn't Tell You

Here's where it gets important: the comparison rate is a useful tool, but it has real limitations.

The $150,000 / 25-year benchmark is outdated. Most Australian home loans today are considerably larger than $150,000 — in Melbourne, the average loan size is several times that figure. Because fees are generally fixed amounts rather than percentages of the loan, their impact diminishes on larger loans. A $500 annual fee has a much smaller proportional effect on a $700,000 loan than on a $150,000 one. This means the comparison rate can overstate the cost impact of fees for larger borrowers.

It doesn't capture the value of features. An offset account can save a disciplined borrower tens of thousands of dollars in interest over the life of a loan — but that benefit isn't reflected in the comparison rate. A loan with a slightly higher comparison rate but a fully functional offset account may genuinely be the better product for many borrowers.

It doesn't account for introductory or honeymoon rates. Some lenders offer a low rate for an initial period before reverting to a higher ongoing rate. The comparison rate smooths this over the full 25-year term, which can make these products look more attractive than they are if you're likely to stay beyond the introductory period.

It's less meaningful for fixed rate loans. The comparison rate on a fixed rate product includes assumptions about what happens after the fixed period ends — which introduces uncertainty. Two fixed rate loans with identical rates during the fixed term might have very different comparison rates based on different assumptions about the revert rate.

How to Use It Properly

The comparison rate works best as a first filter — a quick way to identify loans with high fee structures relative to their interest rate. It's particularly useful for comparing similar loan types (variable to variable, fixed to fixed) at similar loan sizes.

Beyond that first filter, it's worth looking at the actual fees individually:

• What is the annual package fee, and does the package include features you'll actually use?

• Are there monthly account-keeping fees?

• What are the discharge and break costs?

• Does the loan include an offset account, and if so, is it fully functional?

  
  

This more granular assessment — alongside the comparison rate rather than instead of it — gives you a much clearer picture of the true cost and value of a loan.

The Bottom Line

The comparison rate is a useful starting point, not a finishing point. It exists to prevent lenders from obscuring true costs behind low headline rates — and for that purpose it works well. But it has limitations, particularly for larger loans and when comparing products with different features. Use it to screen out obviously expensive products, then dig into the details before making a final call.

Want help cutting through the noise on home loan comparisons? Talk to the Cultivate Financial team — we assess the full picture across multiple lenders so you're not just chasing the lowest number.

This article provides general information only and has been prepared without taking into account your objectives, financial situation or needs. We recommend you consider whether it is appropriate for your circumstances. It does not constitute legal, tax or financial advice — please seek professional advice for your individual situation.