A note payable is a promissory note (essentially an IOU), that obligates the issuing corporation to repay a stated amount at or by a specified maturity date and to pay interest to the lender between the issue date and maturity. A long-term note payable is a note payable that matures in a period that is longer than one operating cycle (i.e., > 1 year).
An installment note is a note payable that requires the repayment of the loaned amount through small increments, over the life of the loan. This is different than the notes discussed above because, in those notes, repayment of the loaned amount was made at the end of the loan period (i.e., at the maturity of the loan).
Each installment payment includes both:
An amount that represents interest, and
an amount that represents a reduction of the loan balance.