You can download a printable 1040 form at the IRS.gov website, explains the IRS. The forms are available in PDF format, and you can choose from the current tax year, as well as past tax years.
To find the 1040 form at IRS.gov, choose the Forms & Pubs option at the top of the home page. From there, a listing of common forms appears, with the 1040 form at the top of the listing. Select the hyperlink so that the form appears on your screen. You can also download the instructions for form 1040 from the same page, explains the IRS.