Form 1099-S - Proceeds from Real Estate Transactions. Use Form 1099-S Copy Ato print and mail payment information to the IRS. 1099-S Forms are 3up on an 8 1/2 x 11" sheet with a 1/2" side perforation and are printed with red scannable ink on 20# laser paper. Mail in a batch to the IRS. Order by number of forms, not sheets.