Instruction books for the Internal Revenue Service Form 1040 are available by clicking the Forms & Publications link at the top of the IRS home page, as indicated on the website. Instructions are available for current year and prior year forms.
As of 2015, Form 1040 instructions are also available by calling the Internal Revenue Service at 800-829-3676, notes the website. Individuals can order a copy of the Form 1040 instructions by clicking the Order Forms & Pubs link on the left of the Forms & Pubs Web page. After clicking the Forms and Publications by U.S. Mail link, the user can find the instructions by entering "Form 1040 Instructions" into the search box.