A lender advertises 6.99% p.a. Another advertises 7.49% p.a. The first looks cheaper. Then you notice the comparison rates: 8.34% and 7.91%. The second loan is actually cheaper once fees are counted. The comparison rate exists precisely to prevent this kind of misdirection — but it has its own limitations worth understanding before you rely on it.
The comparison rate is a single annual percentage figure that combines a loan's interest rate with most mandatory fees. The idea is to give borrowers one number that reflects the true annual cost of a loan, rather than a headline rate that ignores the fees sitting underneath it.
In Australia, lenders are legally required to display the comparison rate alongside any advertised interest rate under the National Consumer Credit Protection Act 2009. You'll see it on bank websites, finance comparison sites, and dealer finance documentation — typically shown directly below the headline rate, often in smaller print.
The comparison rate is always higher than the headline interest rate because it adds the effect of mandatory fees to the base interest charge. A loan with no fees at all would have a comparison rate equal to its headline rate — but those loans are rare.
Before the comparison rate requirement existed, lenders competed aggressively on headline rates while loading fees into the loan. A borrower comparing a 6.5% loan from one lender against a 7.0% loan from another had no easy way to know that the 6.5% loan carried a $600 establishment fee and $15 monthly account fees — making it more expensive in total.
The comparison rate standardises the calculation so the same formula applies to every lender. It doesn't eliminate the need to read the fine print, but it removes the most obvious form of rate window-dressing.
Two lenders, both offering a $40,000 car loan over 5 years:
Lender A's 6.49% headline rate looks substantially better than Lender B's 7.29%. The comparison rates tell the real story — Lender B is nearly $1,800 cheaper over the loan term. The headline rate comparison would have led you to the wrong decision.
The comparison rate is useful but not complete. Several costs are excluded:
Early repayment or exit fees. If you pay the loan out before the end of the term — from savings, an inheritance, or refinancing — many fixed-rate loans charge a break cost. The comparison rate assumes you hold the loan to full term and doesn't reflect what early repayment costs you. On some loans this can be thousands of dollars.
Optional add-on products. Consumer credit insurance, gap insurance, and extended warranties are sometimes bundled into car loans. Each one added to the loan balance means you're paying interest on insurance for the full term. These are excluded from the comparison rate because they're technically optional, even if presented as defaults.
Balloon payment fees. Some lenders charge a fee to set up a balloon payment or refinance one at term. This cost isn't captured in the comparison rate calculation.
Redraw fees. Uncommon on car loans but worth checking if the loan offers redraw — fees to access extra repayments you've made are typically excluded.
Dealer finance in particular often bundles consumer credit insurance and gap cover into the loan amount at the point of signing. These products add to your loan balance and you pay interest on them for the full term. Strip them out and price them separately before accepting any finance package. The comparison rate won't flag this for you.
All comparison rates in Australia are calculated on a standardised $30,000 secured loan over 5 years. This makes them directly comparable between lenders — the same loan amount, same term, same calculation method.
The problem is that your actual loan probably isn't $30,000 over 5 years. And the impact of fixed fees (like a $500 establishment fee) changes significantly depending on your actual loan size:
| Loan amount | Headline rate | $500 est. fee impact | Effective comparison rate |
|---|---|---|---|
| $20,000 | 7.5% | +0.48% | ~7.98% |
| $30,000 (standard) | 7.5% | +0.33% | ~7.83% |
| $50,000 | 7.5% | +0.20% | ~7.70% |
| $75,000 | 7.5% | +0.14% | ~7.64% |
The published comparison rate (calculated on $30,000) overstates the fee impact for large loans and understates it for small ones. If your loan is significantly larger or smaller than $30,000, ask the lender for a total cost of credit figure on your actual amount — this is more reliable than the published comparison rate for your specific situation.
"Can you give me the total amount repayable on a [your amount] loan over [your term], including all fees?" This single number — total dollars out — is the most accurate way to compare two specific loan offers for your actual situation.
The comparison rate is best used as a first-pass filter — a quick way to sort lenders before you go deeper. Here's a sensible approach:
Use the comparison rate to eliminate lenders charging obviously high fees relative to their rate. If two lenders offer similar headline rates but one has a comparison rate 1.5% higher, the fee structure is punishing you — look elsewhere.
Once you have two or three serious candidates, go beyond the comparison rate. Request a full loan schedule — a document that shows every payment, every fee, and the total cost of the loan over its full term. This gives you an exact dollar figure to compare rather than an annualised percentage.
Check early repayment terms separately. If there's any chance you'll pay the loan out early, ask specifically about exit fees and break costs. A loan with a slightly higher comparison rate but no exit fees can be much cheaper than one with a lower rate and a $2,000 break fee if you sell the car in year three.
If you're comparing dealer finance against an external lender, the comparison rate is particularly important — dealers are permitted to mark up interest rates above what the finance company charges them, and the comparison rate is the clearest signal of how expensive the total package actually is.