How we calculate
The installment is calculated to stay constant. Early on, most of it is interest; over time, the principal share grows.
Formula used
PMT is the installment value, PV is the financed (present) value, i is the periodic rate, and n is the number of installments.
PMT = PV × i / (1 − (1 + i)⁻ⁿ)
Practical example
A R$ 10,000 loan at 1% monthly over 12 installments results in payments of about R$ 888.49 each.
How to interpret the result
Check the amortization table to see how much of each payment was interest versus principal.
Limitations
Assumes a fixed rate and does not include fees, insurance or other costs that make up the total cost of credit.