What is a comparison rate, and where can it mislead?

Anyone who has looked at an advertised Australian home loan has seen two percentage figures side by side: the advertised interest rate, and a second, usually slightly higher, figure labelled the comparison rate. The comparison rate exists because the interest rate alone does not tell the whole story of what a loan costs — a lender could advertise an attractive headline rate while loading the loan with fees that make the true cost considerably higher, and the comparison rate is designed to make that harder to hide.

Under Part 10 of the National Credit Code, which forms part of the National Consumer Credit Protection Act 2009, a credit provider advertising a fixed rate of credit intended mainly for personal, domestic or household purposes — which covers the great majority of home loan advertising — is required to display a comparison rate alongside the interest rate. The comparison rate combines the interest rate with most of the fees and charges known at the time the calculation is made, reduced to a single percentage figure, and it is calculated using a standardised loan amount and term set out in the regulations, rather than your own specific loan size or term. That standardisation is genuinely useful for putting different lenders' advertised products on a more even footing than the interest rate alone would allow.

Where it can mislead is in what it does not capture. A comparison rate does not include every possible cost associated with a loan. It generally excludes government charges, fees that cannot be determined in advance, redraw fees, early exit or break costs, and Lenders Mortgage Insurance — the one-off insurance premium that can apply on higher loan-to-value loans, covered in a separate article. It is also calculated on a standard loan amount and term, so if your own loan is meaningfully larger, smaller, or on a different term than the standard assumption used in the calculation, the actual cost profile of the loan for you personally will not match the advertised comparison rate exactly. Two loans with very similar comparison rates can still end up costing meaningfully different amounts for a specific borrower once actual loan size, term, and any costs the comparison rate excludes are factored in.

It is also worth being aware that a comparison rate reflects the fees known and applicable at the time it was calculated and published, and does not account for a rate that later changes — an obvious point for a variable-rate loan, where the comparison rate published at the time of advertising is based on the rate that applied then, not a prediction of what the rate will do afterwards.

None of this makes the comparison rate meaningless — it remains a genuinely useful, legally mandated starting point for putting advertised products on a more comparable footing than a headline interest rate alone. But it is one input into a broader comparison rather than a single final answer, and features specific to your own situation, such as an offset account, redraw flexibility, or the likelihood of paying the loan out early, are not something a comparison rate captures at all, since it is a cost measure rather than a features measure.

This article is general information, not financial advice, and is not a recommendation of any specific loan, lender, or interest rate. Current comparison rates, fees and product features are always worth checking directly with the lender or through a broker for your own specific circumstances, and our directory lists Australian mortgage and finance brokers by area if you are comparing options.

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