AZ2 - Calculate Monthly Mortgage Loan Payment Calculate the monthly payment necessary to amortize a loan (ordinary annuity) when the payments are made at the end of each month. AZ2 accepts input in the forms normally associated with a real estate loan. Input Values Are: Loan Amount - The loan amount in dollars and cents. Do not use commas or dollar signs. Decimals are permitted. Annual Interest Rate - The interest rate, in percent, for the loan. Number of Months - The number of monthly payments to be made on the loan. Fractions are not allowed. This program solves the ordinary annuity equation for the payment and gives the answer in dollars and cents. If you desire hard copy, use the print screen function on your computer.