Load your word processing program. Find the "Drawing" or similarly named toolbar option that allows you to draw shapes, lines and text boxes in your document. Set the size of the document to 8.5 x 11 inches.
Choose the option to draw a text box in your document. Position the text box at the top of the document. Set the size of the text box to 8.5 inches wide and 3 inches tall. This is about a third of the sheet.
Type in the due date for the installment coupon on the first line of the text box. Press the "Tab" key and enter the account number associated with the loan. Press "Tab" again and enter the installment coupon number. The number series for this set of installment coupons is up to you---for instance, you can start with "1," "100" or "1001."
Press "Enter" to start a new line and type your name or company name as the payee. Include your full address and phone number. Press "Enter" again and type in the payer's address information.
List the payment amount on the next line of the coupon, then type in "Amount Enclosed" followed by about 10 underscores to create a blank line. The payer can enter his payment amount on this line.
Type in a message to the payer, if you'd like, at the bottom of the text box (if there is room). For instance, "Thank you for your on-time payment." Include any other details regarding the loan that you want the payer to know.
Select and copy (CTRL + C) the text box containing your installment loan coupon. Press CTRL + V twice to paste two copies to your 8.5 by 11 inch document. Position the other two coupons in the middle and at the bottom of the document. Type in the correct installment loan coupon number in the subsequent coupons (for instance 1002 and 1003).
Insert new pages in your document and copy (CTRL + C) the three text boxes into each page. Again, insert the correct installment coupon numbers for each text box.
Print (CTRL + P) the document. Use a pair of scissors to separate each coupon from the page and place them in order. You can staple the coupons together to present to your payer.