It depends on where you get your loan. Banks often calculate the interest every 3 months and add it on to the principal ..... so you may feel it is three steps forward and one step back.
Credit unions add it on to each repayment. The interest part is taken first and the rest of the repayment comes off the loan balance. It isn't optional, but often it is allowed to make extra payments to bring the capital amount down faster ..... and that will ultimately mean less interest. You only pay interest on the amount you owe.
Payments include prin/int
It is part of the monthly payment.
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