💡 Finance Agreement Interest Rate Example — Explained
A $100,000 equipment purchase advertised with a “10% per year” interest rate over four years might sound straightforward—but the way interest is calculated can make a big difference to your total repayments.
Let’s compare two common approaches:
1. Simple Interest (Flat Rate)
This means 10% is applied to the full $100,000 every year, regardless of how much you’ve already paid off.
10% × 4 years = 40% total interest
Total repayment = $140,000
2. Amortised Interest (Reducing Balance)
Here, interest is charged only on the remaining loan balance. So each year, as you pay down the loan, the interest portion reduces.
Over four years, this would result in approximately $33,420 in total interest
Total repayment = $133,420
⚠️ The key takeaway?
Two loans with the same “10% per annum” label can have very different outcomes, depending on how the interest is structured. Always ask whether the rate is flat or amortised, and request a full repayment schedule before signing.