Comparison Rate vs Interest Rate: What Are You Actually Comparing?

It’s a common moment of confusion when comparing loans: two lenders quote the same headline interest rate, but different comparison rates. Which number should you actually be looking at?

What each rate tells you

The interest rate is exactly what it sounds like — the rate used to calculate the interest charged on your loan balance. It’s the number most directly tied to your repayments.

The comparison rate combines the interest rate with most of the loan’s standard fees and charges, expressed as a single percentage, calculated against a standardised loan example (in Australia, typically a $150,000 loan over 25 years, regardless of your actual loan amount). It’s a regulated disclosure requirement designed to make headline rates easier to compare like-for-like.

Why they can tell different stories

A loan with a low interest rate but high ongoing fees might have a comparison rate that’s noticeably higher than the interest rate — revealing costs that aren’t obvious from the interest rate alone. Conversely, a loan with a slightly higher interest rate but minimal fees might have a comparison rate very close to its interest rate.

This is the exact scenario the comparison rate is designed to surface: two loans that look similar on interest rate alone, but cost meaningfully different amounts once fees are factored in.

The catch: comparison rates use a standard example

Because comparison rates are calculated against a standardised loan amount and term, they may not reflect your actual costs if your loan is a different size or structure. A comparison rate is a useful relative tool for comparing similar products to each other — it’s less useful as an exact prediction of your own total cost.

What this means practically

When comparing loan options:

1. Look at the interest rate to understand your likely repayments
2. Look at the comparison rate to get a sense of the total cost including fees, relative to other products
3. Ask directly what fees apply to your specific loan amount and structure, since the comparison rate’s standard example may not match your situation

Where a broker adds value here

A broker can model out your actual likely costs — using your real loan amount and term rather than the standardised comparison rate example — and show you a genuine side-by-side of what different lenders would actually cost you specifically, not just their published comparison rate.

The bottom line

The interest rate and comparison rate answer different questions: one is about your repayments, the other is a standardised measure of total cost including fees. Neither on its own tells you your exact cost — but together, and combined with a broker running the numbers for your actual loan, they give a much clearer picture than either figure alone.