Two lenders can advertise the same headline rate and cost you thousands of dollars apart over a five-year loan. The headline rate is the number lenders put in the ads. The comparison rate, the fee structure, the security arrangement, and the actual loan amount you qualify for are where the real difference lives. This guide explains how to read each of them — and what a rate comparison actually needs to include to be useful.
The headline interest rate (sometimes called the nominal rate or annual percentage rate) is the base rate charged on the loan balance, expressed annually. A loan advertised at 7.5% p.a. charges 7.5% of the outstanding balance per year, divided across monthly repayments.
What it doesn't include: establishment fees, monthly account fees, early repayment charges, or any other cost of borrowing. Two loans at 7.5% can have meaningfully different real costs once fees are factored in. The headline rate is a useful starting filter, nothing more.
It's also worth noting that the advertised rate is often the rate available to the most creditworthy borrowers. The rate you're actually offered will depend on your credit history, income, existing debt, and the lender's current appetite. "From 6.99%" in a lender's ad may translate to 9.5% for your application.
The comparison rate was introduced specifically to address the problem of hidden fees. It combines the interest rate and most mandatory fees into a single annual percentage, giving a truer picture of the loan's cost. In Australia, lenders are legally required to display the comparison rate alongside any advertised interest rate under the National Consumer Credit Protection Act.
The comparison rate is standardised: calculated on a $30,000 secured personal loan over a 5-year term. This means it's directly comparable between lenders — the same loan amount, same term, same assumptions.
Because the comparison rate is calculated on a $30,000 loan over 5 years, it can be misleading for your specific situation. A flat establishment fee of $500 has a much larger percentage impact on a $20,000 loan than on a $60,000 one. If your actual loan amount or term differs substantially from the standard, calculate the fee impact on your actual numbers — not the comparison rate's hypothetical ones.
That said, the comparison rate is still substantially more useful than the headline rate for like-for-like comparisons between lenders. Always use it as your primary sorting criterion, then investigate the detail.
The comparison rate captures most mandatory fees but not all costs. These are the ones to check separately:
Early repayment fees. If you plan to pay the loan out early — from a windfall, a refinance, or selling the vehicle — the exit fee can eliminate any interest saving from early repayment. Fixed rate loans in particular often carry break costs. The comparison rate assumes you hold the loan to full term; it won't reflect exit costs.
Redraw fees. If the loan has a redraw facility (uncommon on car loans but not unheard of), fees to access extra repayments are typically not included in the comparison rate.
Balloon-related fees. Some lenders charge an additional fee to set up a balloon payment or to refinance a balloon at term. This won't appear in the comparison rate calculation.
Insurance add-ons. Dealers and some lenders bundle consumer credit insurance, gap insurance, or extended warranties into the loan. These are optional products but are often presented as default inclusions. Each one added to the loan balance means you're paying interest on insurance for the full loan term. Price them separately before accepting.
The vast majority of personal car loans in Australia are fixed rate — the rate is locked for the full term regardless of what happens to cash rates or lender funding costs. This is generally appropriate for a depreciating asset on a defined repayment schedule. You know exactly what you'll pay each month and can plan accordingly.
Variable rate car loans exist but are less common. The rate moves with market conditions — potentially in your favour if rates fall, potentially against you if they rise. Variable loans sometimes offer greater repayment flexibility, including the ability to make additional repayments without break costs.
The right choice depends on two things: your view on rate direction (which most borrowers are not well-positioned to predict) and your need for repayment flexibility. If certainty matters more than flexibility, fixed. If you expect to repay significantly early, variable may be worth the rate risk.
A secured car loan uses the vehicle as collateral — the lender holds a security interest and can repossess the car if you default. Because the lender's risk is lower, the rate is lower.
An unsecured personal loan has no collateral. The lender prices the additional risk into the rate, which is typically 2–4 percentage points higher than a comparable secured loan. On a $55,000 loan over five years, that difference costs roughly $3,000–$6,000 in additional interest.
Use a secured loan wherever possible. The only situations where unsecured makes sense are when the vehicle doesn't qualify as security (some older vehicles, grey imports), when you're buying privately and the lender's security process is too slow, or when the specific unsecured rate you're offered is competitive with secured rates elsewhere.
Lenders typically offer lower rates on new vehicles than used ones. The reasoning is straightforward — a new vehicle has a predictable value trajectory and poses lower repossession risk than a used vehicle of uncertain history and condition.
The gap is often 1–2 percentage points, which matters more on larger loan amounts. On a $60,000 loan over five years, a 1.5% rate premium on a used vehicle costs roughly $2,300 extra in interest. This doesn't mean you shouldn't buy used — it means it's one more cost to factor in when comparing new vs used on a total cost basis.
Some lenders cap the age of vehicle they'll secure against — often 10–12 years at loan maturity. A 7-year-old car on a 5-year loan would be 12 years old at maturity, which sits at or beyond many lenders' limits and may push you toward unsecured lending.
When you finance through a dealership, the rate you're quoted is not necessarily the rate from the underlying lender. Dealers act as intermediaries and are permitted to mark up the interest rate above what the finance company charges — the difference (called a "dealer finance reserve") is kept by the dealer as commission.
This is legal, common, and rarely disclosed unless you ask. The practical implication is that dealer finance rates are often 1–3% higher than equivalent rates available directly from the same finance company or a competing lender. On a $55,000 loan at 2% above market rate for five years, that's roughly $3,200 in additional interest.
Dealer finance is not always more expensive — dealers sometimes have access to manufacturer-subsidised rates (particularly on new vehicles from volume brands) that beat the open market. The answer is to get at least one external loan pre-approval before visiting the dealership, so you have a reference rate to benchmark the dealer's offer against.
Walking into a dealership with a pre-approved loan from your bank or a broker changes the negotiation. You're not dependent on the dealer's finance. The dealer knows this, and in many cases will either match the external rate or offer a genuine manufacturer rate that's competitive. Without a reference point, you're comparing the dealer's quote against nothing.
When you have two concrete offers in front of you, here's what to look at in order: