Comparison Rate Explained: Why It Matters More Than the Interest Rate

Key Takeaways

•        The comparison rate combines the interest rate with most fees and charges into a single figure, giving a truer picture of a loan's cost than the advertised rate alone.

•        A low headline rate can hide high fees, so a loan that looks cheaper may actually cost more once the comparison rate is taken into account.

•        By law, lenders must show the comparison rate alongside the advertised rate, based on a standard example loan.

•        It is a useful guide, not the whole story: it does not capture every fee, your actual loan size, or features like an offset, so use it alongside other factors.

When you are shopping for a home loan, the big number lenders advertise is the interest rate, and it is tempting to treat the lowest one as the best deal. But there is a second number sitting right next to it, the comparison rate, that often tells you more about what a loan will really cost. Understanding it can save you a lot of money.

In this guide, we will explain what the comparison rate is, why it can matter more than the headline rate, how it is worked out, and where its limits are. By the end, you will know how to use it to compare loans like a pro, and why the cheapest-looking rate is not always the cheapest loan.

The comparison rate is a helpful tool, but the right loan still depends on your situation. To compare the true cost across lenders for your actual loan, not just a standard example, speak to Loan Street Finance, with no cost and no pressure.

What Is the Comparison Rate?

The comparison rate exists to solve a simple problem: the advertised interest rate does not tell you the full cost of a loan.

The comparison rate is a single percentage that combines the interest rate with most of the fees and charges on a loan, expressed as a single figure. The idea is to give you a more honest, like-for-like way to compare loans, because two loans with the same interest rate can cost very different amounts once fees are added. In Australia, lenders are required by law to display the comparison rate whenever they advertise an interest rate, precisely so borrowers are not misled by the headline number alone.

Why It Matters More Than the Advertised Rate

The advertised rate is only part of the cost. The comparison rate is designed to capture the rest.

A lender can advertise a very low interest rate and then attach hefty fees: an application fee, ongoing monthly or annual fees, and other charges. Those fees add to what you actually pay, but they do not show up in the headline rate. The comparison rate factors in fees, so a loan with a low rate but high fees will show a higher comparison rate, revealing its true cost. That is why a loan with a slightly higher advertised rate but no fees can work out cheaper than a headline-grabbing low rate loaded with charges. The comparison rate is what lets you see past the marketing.

How the Comparison Rate Is Calculated

To make comparison rates comparable, they are all worked out the same way, using a standard example set by law.

The comparison rate is calculated on a standardised loan, in Australia, $150,000 borrowed over 25 years with monthly repayments, combining the interest rate with the fees and charges that apply. Because every lender uses the same example, you can line up their comparison rates side by side for a fair comparison. It includes things like application and ongoing fees, but not every possible cost, which is where its limits begin.

The Limits of the Comparison Rate

As useful as it is, the comparison rate is a guide, not a precise measure of what you will pay. A few limitations are worth knowing.

The Standard-Loan Assumption

The figure is based on a $150,000 loan over 25 years, which is well below the average Australian mortgage. If your loan is larger, fixed fees make up a smaller share of the cost, so the comparison rate tends to overstate their impact. It is a fair basis for comparison, not a personalised quote for your loan.

The Costs Left Out

The comparison rate cannot include every charge. Costs such as redraw fees, late fees, break costs on fixed loans, and certain government charges are excluded, often because they cannot be known in advance. Two loans with the same comparison rate can still differ in these.

The Features Ignored

The comparison rate measures cost, not value. It does not account for features you might use, such as an offset account, a redraw facility, or the ability to make extra repayments. A loan with a slightly higher comparison rate might still be the better choice if its features suit you more.

How to Use It Wisely

The comparison rate is most powerful when you treat it as one tool among several, not the only number that matters. When comparing loans, it helps to:

•        Look at the comparison rate, not just the advertised rate, to gauge true cost.

•        Check which fees apply to your actual loan size, since fixed fees matter less on a larger loan.

•        Weigh up features you will genuinely use, like an offset, against a small rate difference.

•        Consider the total cost over your real loan term, not just the standard example.

•        Ask a broker to compare loans on the figures that match your situation.

Used this way, the comparison rate keeps you from being dazzled by a low headline rate while still leaving room to judge what it cannot measure.

A Real-World Example: When the Cheaper Rate Costs More

Here is an illustration with rounded figures showing how the comparison rate changes the picture. Treat it as a guide only.

Imagine two loans. Loan A advertises a tempting 6.19%, but charges a $395 annual fee. Loan B advertises 6.45%, with no ongoing fee. On the headline rate alone, Loan A looks clearly cheaper.

Once the fees are factored in, the comparison rates tell a different story: Loan A comes out to around 6.55%, while Loan B sits at around 6.47%. Despite its higher advertised rate, Loan B is actually the cheaper loan on this measure, because it is not weighed down by an annual fee.

This is the comparison rate doing its job. The lesson is not that fees always tip the balance, since on a very large loan a fixed fee matters less, but that the headline rate alone can point you the wrong way. Always look at both.

Where to Read More

The comparison rate is a consumer protection built into Australian lending law. The Australian Government's MoneySmart service explains what a comparison rate is and how it helps you work out the true cost of a loan, which is helpful background before you compare.

Frequently Asked Questions (FAQs)

What is a comparison rate?

A comparison rate is a single figure that combines a loan's interest rate with most of its fees and charges, to show a truer picture of the cost. Lenders in Australia must display it alongside any advertised rate, so you can compare loans on a more like-for-like basis rather than the headline rate alone.

Why is the comparison rate different from the interest rate?

Because the interest rate ignores fees, while the comparison rate includes them. A loan may advertise a low rate but charge high application or ongoing fees, which increase its real cost. The comparison rate includes those fees, so it often sits higher than the advertised rate and gives a fairer guide to what you will pay.

Is a lower comparison rate always better?

Usually, it is a better guide than the advertised rate, but not always the final word. The comparison rate does not capture every fee, your actual loan size, or features you might value. A loan with a slightly higher comparison rate can still be the better choice if its features suit you, so use it alongside other factors.

How is the comparison rate calculated?

It is worked out on a standard example loan in Australia: $150,000 over 25 years, combining the interest rate with the fees and charges that apply. Using the same example for every lender makes comparison rates comparable to one another.

Does the comparison rate include all fees?

No. It includes many fees, such as application and ongoing fees, but it excludes costs that cannot be known in advance, such as redraw fees, late fees, break costs, and some government charges. Two loans with the same comparison rate can still differ once they are counted.

Should I just pick the loan with the lowest comparison rate?

Not on its own. The lowest comparison rate is a strong starting point, but the best loan for you also depends on the fees specific to your loan, the features you will use, and the total cost over your actual term. It is worth comparing figures that match your situation, and a broker can help with that.

The Bottom Line

The comparison rate exists for a simple reason: the advertised interest rate does not tell you the full cost of a loan. By rolling in most fees and charges, it gives a truer, more comparable figure, and it can reveal that a loan with a tempting low rate is actually dearer than one with a slightly higher rate and no fees. That is why it often matters more than the headline number.

It is not perfect, though. Built on a standard example, it does not capture every cost, your real loan, or the features you might value, so it is a guide rather than the final answer. Use it to see beyond the marketing, then weigh what it cannot measure. If you would like loans compared on the figures that actually match your situation, we would be glad to help.