If you filed online, you might be able to reprint it from that site if you have the id and password that was used to create it. Otherwise use form 4506-T
http://www.irs.gov/pub/irs-pdf/f4506t.pdf tp request a transcript from the IRS. Read the instructions on the form. You can request it online or by phone, or my mail. If you need it fast, you can also go to an IRS service center.