You fill out Schedule C at tax time and attach it to or file it electronically with Form 1040. Schedule C is typically for people who operate sole proprietorships or single-member LLCs.

Some taxpayers have to attach additional forms to the 1040. For example, sole proprietors who have self-employment income to report must complete a Schedule C form to declare the income (or loss ...

As tax season approaches, it's crucial to stay informed about the latest updates to IRS Form 1040 and its schedules.