What is a sole proprietor? Upsolve August 19, 2018 19:05 A sole proprietor is someone who owns an unincorporated business by himself or herself. See definition here: https://www.irs.gov/businesses/small-businesses-self-employed/sole-proprietorships. Related articles Why you should not include credit card or personal loan debt payments in Schedule J (Expenses) What is the difference between an EIN, TIN, and ITIN? Why it can make sense to wait to file bankruptcy if your tax refund was taken by a student loan lender What types of debts should be included in the contracts section (Schedule G) of the questionnaire/petition? I can’t find my pay stubs. What should I do? Comments 0 comments Article is closed for comments.