About Form 3115, Application for Change in Accounting Method Information about Form 3115, Application for Change in Accounting Method, including recent updates, related forms and instructions on how to file. About Publication 526, Charitable Contributions Information about Publication 526, Charitable Contributions, including recent updates. Publication 526 explains how to claim a deduction for charitable contributions. About Schedule C (Form 1040 or 1040-SR), Profit or Loss from Business (Sole Proprietorship) Information about Schedule C (Form 1040 or 1040-SR), Profit or Loss from Business (Sole Proprietorship), including recent updates, related forms, and instructions on how to file. Schedule C (Form 1040 or 1040-SR) is used to report income or loss from a business operated or a profession practiced as a sole proprietor. Related Items About Publication 334, Tax Guide for Small Business (For Individuals Who Use Schedule C) Publication 334 Chapter 1 Related Items About Publication 334 Chapter 2 Related Items About Publication 334 Chapter 3 Related Items Publication 334 Chapter 4 Related Items About Publication 334 Chapter 5 Related Items About Publication 334 Chapter 6 Related Items Publication 334 Chapter 8 Related Items Publication 334 Chapter 9 Related Items Publication 334 Chapter 10 Related Items About Publication 334 Chapter 11 Related Items About Publication 334 Chapter 12 Related Items