Most business term loans — for equipment, vehicles, property or working capital — are amortizing: you pay the same amount every month, and by the final payment the loan is fully repaid. What changes from month to month is how each payment is split between interest and principal. Understanding that split helps you compare offers, plan cash flow and decide whether paying early is worth it.
How a payment is split
Each month, the lender charges interest on the balance you still owe. Your payment covers that interest first; whatever is left reduces the balance.
- Interest this month
- equals Remaining Balance × (Annual Rate ÷ 12)
- Principal this month
- equals Payment − Interest this month
Because the balance is largest at the start, early payments are mostly interest. As the balance falls, the interest portion shrinks and more of each payment goes to principal — so the balance falls faster and faster toward the end.
An example
Take a $100,000 loan at 8% APR over 10 years. The monthly payment works out to $1,213.28.
- Month 1: interest is $100,000 × 0.08 ÷ 12 = $666.67, so only $546.61 reduces the balance.
- Year 1 in total: $7,754.07 of interest and $6,805.25 of principal.
- Year 10: just $611.76 of interest and $13,947.56 of principal.
- Over the full term you pay $45,593.11 in interest.
The payment formula
The fixed payment is the amount that, after interest each month, brings the balance to exactly zero on the last payment:
- Payment
- equals Loan × r ÷ (1 − (1 + r)^−n)
where r is the monthly rate (annual rate ÷ 12) and n is the number of monthly payments.
What this means for decisions
Term length
A longer term lowers the monthly payment but increases total interest, because the balance stays high for longer. Compare both numbers — the payment for cash flow, the total interest for cost.
Paying early
Extra payments go straight to principal, so every future interest charge is calculated on a smaller balance. Extra payments early in the loan save the most interest. Check your loan agreement first: some business loans charge prepayment penalties.
Comparing offers
Use the APR, which includes most fees, rather than the headline rate. Two loans with the same rate can cost different amounts if one carries origination fees.
See your own schedule with the Loan Payment Calculator.
This guide is general information, not financial, tax or legal advice. See our disclaimer.