Your monthly payment, total interest and total cost — for any loan.
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| Year | Principal paid | Interest paid | Balance left |
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With the amortization formula: payment = P × r × (1 + r)^n ÷ ((1 + r)^n − 1), where P is the loan amount, r is the monthly interest rate (APR ÷ 12) and n is the number of monthly payments. If the APR is 0%, the payment is simply the amount divided by the number of months.
APR (Annual Percentage Rate) is the yearly cost of borrowing expressed as a percentage. For a simple installment loan it is close to the interest rate; for some loans it also includes lender fees, which makes it the fairest number to compare between offers.
A longer term lowers the monthly payment but increases the total interest you pay, often by a lot. Try the same amount above with a shorter term and compare the total interest — the difference is the real price of the lower monthly payment.
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