Business Loan Calculator: How to Estimate Your Repayments in Australia

Most online business loan calculators give you a ballpark monthly repayment based on a loan amount, term, and interest rate. While useful for rough planning, they rarely account for the full picture: establishment fees, ongoing monthly fees, early repayment penalties, and the critical difference between interest rates and factor rates.

Understanding these variables matters because two loans with the same headline rate can differ by thousands of dollars in total cost. This guide walks through each component so you can estimate your real repayment obligation before speaking to a lender.

This is the most common source of confusion in Australian business lending. Banks and some lenders quote annual percentage rates, where interest is charged on the declining balance — as you repay principal, the interest portion of each payment decreases. This is the same model as a home loan.

Many non-bank and short-term lenders quote factor rates instead. A factor rate is a simple multiplier applied to the total loan amount upfront. For example, a factor rate of 1.25 on a $100,000 loan means you repay $125,000 regardless of when you repay or how quickly you reduce the balance.

A standard principal-and-interest business loan repayment consists of two parts: a portion that reduces your outstanding balance and a portion that covers the interest charge. In the early months, a larger proportion goes to interest. As the balance reduces, more of each payment goes toward principal.

For a $100,000 unsecured business loan at 15% annual interest over 24 months, monthly repayments would be approximately $4,850. Over the full term, you would repay roughly $116,400 — the original $100,000 plus $16,400 in interest. Adding a typical 2% establishment fee brings the total cost to around $118,400.

Beyond the interest rate, several fees can materially change your total borrowing cost. Some are one-off, others are ongoing, and some only apply in specific circumstances.

When you receive multiple loan offers, the most reliable way to compare them is total cost in dollars over the life of the loan. Ask each lender: if I borrow this amount for this term and repay on schedule, what is the total dollar amount I will repay? This single number cuts through the confusion of different rate types, fee structures, and repayment frequencies.

A comparison platform like FundingCheck shows you multiple offers from across a panel of 30+ lenders, making it straightforward to compare the true cost of each option against your specific borrowing amount and term.

For rough planning before you speak to a lender, these simplified formulas give you a starting point.

The standard amortisation formula accounts for both principal reduction and interest. While the formula itself is complex, the result for common scenarios is straightforward: for every $10,000 borrowed at 15% over 12 months, expect approximately $905 per month in repayments. At 10% over 24 months, expect approximately $461 per month per $10,000.

These figures assume no fees. Add 2-3% to the total for establishment costs and any ongoing monthly charges to get a more realistic total.