Comparison Rates Made Simple: Looking Beyond the Advertised Interest Rate
Key Takeaways
The comparison rate folds most fees into the interest rate to show a truer cost, and the gap between the two tells you how much the fees add.
It is built on a standard example, commonly a $150,000 loan over 25 years, so on a larger loan a flat annual fee matters far less than the published figure suggests.
It excludes government and conveyancing costs, the value of features like an offset, and the real effect of cashback and introductory rates.
The genuinely cheapest loan is the one that costs least on your actual loan amount, with the features you will use, over the time you will hold it.
When rates are high, the difference between two home loans can be worth tens of thousands of dollars over the life of the loan, so it is natural to chase the lowest number you can find. With the Reserve Bank of Australia (RBA) cash rate at 4.35% after a run of increases through the first half of 2026 and variable rates in the high 6% range, borrowers are comparing loans more closely than they have in years. The problem is that the advertised interest rate, the figure lenders put in their headlines, rarely tells you the true cost of a loan.
This is where the comparison rate comes in. It is designed to give a fairer picture by folding most fees into a single percentage, and it is a genuinely useful tool. But it has limits that catch many borrowers out, because it is based on a standard example that may look nothing like your loan, and it ignores the value of features that can save you real money.
This article explains what a comparison rate is, what it includes and leaves out, why the lowest rate is not always the cheapest, and how to compare loans in a way that reflects your actual situation rather than a textbook example.
What is a comparison rate?
A comparison rate is a single percentage that combines a loan's interest rate with most of its fees, expressed as one figure so you can weigh loans on a more even footing. In Australia, lenders are required to display a comparison rate alongside any advertised interest rate.
The idea is to stop a low headline rate from hiding high fees. By rolling the interest rate and most ongoing and upfront costs into one number, the comparison rate gives you a quick way to see whether a cheap-looking rate is genuinely cheap once the fees are counted. It is calculated on a standard example so that every lender's figure is worked out the same way, which is both its strength and, as we will see, one of its weaknesses.
Interest rate versus comparison rate
Understanding the difference between these two numbers is the foundation of comparing loans well. They measure different things, and the gap between them is itself a useful signal.
The advertised interest rate is simply the cost of borrowing the principal, the percentage charged on what you owe. The comparison rate takes that interest rate and adds most of the fees, then expresses the total as a single percentage. When a loan has a low interest rate but high fees, its comparison rate will sit noticeably above its advertised rate. When the gap between the two is small, the loan has relatively low fees. Looking at the size of that gap tells you, at a glance, how much the fees are adding to the headline rate.
What fees a comparison rate usually includes
To read a comparison rate well, it helps to know which costs it captures. The included fees are mostly the ones charged directly by the lender over the life of the loan.
A comparison rate generally includes:
The interest rate itself.
Upfront fees such as establishment or application fees.
Ongoing fees, including monthly account fees or annual package fees.
Valuation fees were the lender's.
Settlement or discharge fees are applied at the end of the loan.
By combining these into the rate, the comparison figure captures the running cost of the loan more fully than the interest rate alone, which is exactly what makes it more useful for a fair comparison.
What comparison rates do not show
For all its usefulness, the comparison rate is a partial picture, and the things it leaves out are often the things that decide which loan is genuinely cheaper for you. These omissions are where careful borrowers gain an edge.
Government and third-party costs
A comparison rate does not include government charges and third-party costs such as stamp duty, government registration fees or conveyancing. These are real costs of buying, but because they are not lender fees, they sit outside the comparison rate entirely, so you need to budget for them separately.
The standard loan assumption
This is the limitation that catches most people. A comparison rate is calculated on a standard example, commonly a $150,000 loan over 25 years, which rarely matches a real loan today. Loan size matters because a fixed annual fee weighs more heavily, in percentage terms, on a small loan than a large one. A $395 annual fee is a larger slice of a $150,000 loan than of a $600,000 loan, so the standard comparison rate can overstate the impact of fees on a bigger loan and understate it on a smaller one. Your real comparison rate, on your actual loan amount and term, can look quite different from the published figure.
The value of features
Comparison rates do not capture the value of features such as an offset account, redraw, extra repayments or a split facility. A loan with a slightly higher comparison rate but a strong offset account can cost you less in practice if you keep a meaningful balance in it, because the interest saved through the offset is not reflected in the published number.
Cashback, introductory rates and revert rates
Upfront cashback offers and introductory or honeymoon rates are not reflected in the comparison rate in a way that captures their real long-term effect. A low introductory rate that later reverts to a higher rate can cost more over the full term than a loan with a steady, slightly higher rate, even though the introductory figure looks better at first glance.
Why the lowest advertised rate is not always the cheapest
It is tempting to sort loans by the headline rate and pick the lowest, but that approach can mislead you. The advertised rate is only one part of the cost, and the cheapest-looking option can carry the highest fees.
Consider two loans. Loan A advertises 6.10% but charges a $395 annual package fee. Loan B advertises 6.25% with no annual fee. On the standard comparison basis of a small loan, Loan A's comparison rate can end up higher than Loan B's, because the fee is spread across a relatively small balance. The comparison rate exists precisely to surface this, steering you away from the loan whose low headline rate is offset by high fees. Looking only at the advertised rate would have hidden the difference entirely.
Why the lowest comparison rate is not always best
If the advertised rate can mislead, so can the comparison rate, just in the opposite direction. Choosing purely on the lowest comparison rate ignores two things that matter a great deal: your actual loan and the loan's features.
Take the same two loans on a real $600,000 loan rather than the standard example. The $395 annual fee on Loan A is now a much smaller proportion of the balance, so Loan A may actually cost you less than Loan B over your loan, even though its standard comparison rate looked higher. The published comparison rate, built on a small standard loan, pointed the other way. Add to this the value of features and the question of whether you even fit a lender's policy, since the cheapest rate is no use if your application does not meet the lender's criteria, and it becomes clear that the lowest comparison rate is a starting point, not the answer.
How loan features can change the real value
Features are where two loans with similar rates can diverge sharply in real cost. The key is to value only the features you will actually use, rather than paying for ones you will not.
An offset account is the clearest example. If you consistently hold a meaningful balance, the interest it saves can outweigh a small difference in comparison rate, making a loan with a marginally higher rate the cheaper choice in practice. Redraw, the ability to make extra repayments without penalty, and split-loan flexibility can each add value depending on how you manage money. The discipline is to match the features to your real behaviour: a feature you will use can justify a slightly higher rate, while one you will not use is simply a cost with no benefit.
Cashbacks, package fees and introductory rates
Lenders often compete with upfront incentives, and these can distort a decision if you let them. Weighing them over the full life of the loan, rather than the first year, keeps them in perspective.
A cashback offer can be genuinely useful, but it is a one-off benefit that should be weighed against the loan's ongoing rate and fees over the years you will hold it; a large cashback paired with a higher rate can cost more in the long run. An introductory or honeymoon rate works the same way: the early saving can be erased once the loan reverts to its ongoing rate, so it is worth checking what the revert rate is before being drawn in by the introductory figure. The principle is to avoid letting a short-term incentive drive a long-term decision.
How to compare loans properly
Pulling these threads together, comparing loans well means looking past any single number to the full cost and fit for your situation. A simple, disciplined approach gets you most of the way.
Look at both the advertised rate and the comparison rate, and note the gap between them.
Remember what the comparison rate excludes, including government costs and feature value.
Factor in your real loan size and term, not the standard example the comparison rate uses.
Value only the features you will actually use, such as an offset you will keep funded.
Weigh any cashback or introductory rate over the full term, not just the first year.
Consider whether you fit the lender's policy, since approval likelihood matters as much as price.
This approach keeps the comparison rate in its proper place: a helpful guide, not the final word.
Real borrower scenarios
The way these ideas play out becomes clearer through real situations. The following examples show how looking beyond the headline rate changes the decision.
A first home buyer is drawn to a low introductory rate, then realises it reverts to a higher rate after the introductory period, which would cost more over the years they plan to hold the loan than a steadier alternative.
A refinancer is attracted by a cashback offer, but once the discharge fee on their current loan, the new application and valuation fees, and the effect of resetting the loan term are counted, the real savings are smaller than the cashback suggested.
A borrower with consistent savings chooses a loan with a slightly higher comparison rate because its offset account, kept well funded, saves them more in interest than the rate difference costs.
A borrower taking a large loan finds that a flat annual fee, which inflated the standard comparison rate, barely affects their real cost, so a loan that looked expensive on paper is competitive for their actual amount.
How a mortgage broker compares loans
Comparing loans well means weighing the rate, the comparison rate, the fees, the features, your real loan size, the lender's policy, and your goals all at once, which is difficult to do across a crowded market on your own. This is where a broker adds practical value beyond finding a rate.
A broker can work out your comparison rate on your actual loan rather than the standard example, value the features against how you manage money, weigh cashback and introductory offers over the full term, and factor in which lenders you are likely to be approved with. If you are comparing loans and want to look past the headline number, speaking with a mortgage broker in Albury & Wodonga can help you assess the true cost for your loan size, weigh fees and features properly, and choose a loan that fits your goals rather than just the lowest advertised rate.
Frequently Asked Questions (FAQs)
What is the difference between an interest rate and a comparison rate?
The interest rate is the cost of borrowing the principal, while the comparison rate combines that interest rate with most of the loan's fees into a single percentage. The comparison rate is designed to show the truer cost of a loan, so a low interest rate paired with high fees will have a higher comparison rate. The gap between the two indicates how much the fees add.
Why is the comparison rate higher than the advertised rate?
It is higher because it includes fees that the advertised rate leaves out, such as establishment fees and ongoing annual or monthly charges. The more a loan charges in fees, the larger the gap between its advertised rate and its comparison rate. A small gap suggests low fees, while a large gap signals that the headline rate is not the full story.
What fees are excluded from a comparison rate?
A comparison rate generally excludes government charges and third-party costs such as stamp duty, government registration fees and conveyancing, since these are not lender fees. It also does not capture the value of features like an offset account, the effect of cashback offers, or break costs on fixed loans. These exclusions mean the comparison rate is a guide rather than a complete cost.
Should I just choose the loan with the lowest comparison rate?
Not necessarily. The comparison rate is based on a standard loan example that may not match your loan size or term, and it ignores feature value and lender policy. A loan with a slightly higher comparison rate but a useful offset, or one better suited to your situation, can be cheaper or more appropriate for you. Use the comparison rate as a starting point, not the only factor.
How do offset accounts affect the real cost of a loan?
An offset account reduces the interest you pay by offsetting your savings against your loan balance, but this benefit is not reflected in the comparison rate. If you keep a meaningful balance in an offset, the interest you save can outweigh a small difference in comparison rate, making a loan with a marginally higher rate the cheaper option in practice. The value depends on how much you keep in the offset.
Do comparison rates include cashback offers?
No. Cashback offers are not built into the comparison rate, so a loan with an attractive cashback may still have a higher ongoing cost than one without. A cashback is a one-off benefit that should be weighed against the loan's rate and fees over the full time you expect to hold it, rather than treated as a reason on its own to choose a loan.
Why does my actual cost differ from the published comparison rate?
Because the published comparison rate is calculated on a standard example, commonly a $150,000 loan over 25 years, which rarely matches your real loan. On a larger loan, fixed fees have less impact than the standard figure suggests, and on a smaller loan they have more. Your features, repayments and loan term also shape your real cost, so your actual figure can differ from the published one.
The Bottom Line
The advertised interest rate is only the starting point, and the comparison rate is a better guide because it folds in most fees, but neither tells you the full story on its own. The comparison rate is built on a standard loan that may look nothing like yours, and it ignores the value of features such as an offset account, as well as cashback offers, introductory rates and whether you fit a lender's policy. The genuinely cheapest loan is the one that costs you the least on your actual loan amount, with the features you will use, over the time you will hold it. Compare the rate and the comparison rate together, look past the headline incentives, and weigh the loan against your own circumstances rather than a textbook example.