Mortgage Interest. Use the 1098 Copy C to print and mail payment information to the recipient (payee) for submission with their federal tax return. Forms are 3-up on an 8 ½” x 11” sheet with a ½” side perforation and are printed on 20# laser paper. Order the quantity equal to the number of employees for which you need to file. Mail in envelope #99DWENV05 or #99SWENV05 .