Schedule C (Form 1040) 2018 is used to report profit or loss from a business. This document provides instructions on how to fill out the form, including information on income, expenses, and cost of goods sold. It also includes information on vehicle expenses and other expenses not included on the form. This form is for sole proprietorships and must be attached to Form 1040, 1040NR, or 1041. Get expert help with Desklib.