Short answer: The costly mistakes are usually about focusing on the repayment instead of the total cost, applying in too many places, and signing at the dealership before you've read the contract. Most can be avoided by sorting out your budget and finance before you go car shopping.
1. Judging the loan on the weekly repayment
A lower repayment often just means a longer term or a balloon at the end. Example only: $30,000 at 9% p.a. costs about $623 a month over 5 years, with roughly $7,365 in total interest. Over 7 years the repayment drops to about $483, but total interest climbs to around $10,544. Look at the total amount payable, which must appear in the contract.
2. Shopping for the car before the finance
If you pick the car first, you're more likely to accept whatever finance is offered on the day. Knowing roughly what you can borrow, and at what cost, puts you in a better spot to negotiate. It also stops you falling for a car you can't comfortably afford.
3. Applying with several lenders at once
Each formal application usually leaves a credit enquiry on your file, and enquiries stay there for 5 years. Several close together can make lenders cautious. A licensed broker can look at a range of lenders and put in one application that fits your situation, rather than you trying lenders one after another.
4. Forgetting the costs on top of the loan
- Stamp duty and transfer or registration fees, which vary by state
- CTP and comprehensive insurance. Lenders usually require comprehensive cover on a financed car
- Servicing, tyres, fuel or charging, tolls and parking
Moneysmart has a car loans guide that's worth reading before you commit.
5. Rolling add-ons into the loan
Extended warranties, tyre and rim cover, paint protection and loan protection insurance can add thousands to the loan. When they're financed, you pay interest on them too. Add-on insurance can't usually be sold to you on the spot when you buy the car, so you have time to think. Only take what you'd pay cash for.
6. Not checking a private-sale car
If you're buying privately, run a check on the PPSR first. It shows whether money is still owed on the car and whether it's recorded as stolen or written off. Lenders will usually do this too, but checking early saves time and heartache.
7. Stretching your income on the application
Lenders must verify your income and expenses, and they check bank statements. Overstating income or leaving out debts can get an application declined, or leave you with repayments you can't manage. Be accurate, even if it means a smaller loan.
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General information only. This isn't financial advice. Finance the Ride is a referral service and doesn't hold an Australian Credit Licence. Last reviewed September 2026.