Form detail
IRS Form Schedule C (Form 1040)
Profit or Loss From Business (Sole Proprietorship)
Country
United States
Revision year
2024
Methods
paper, efile
Updated
2026-05-20
Profit or Loss From Business (Sole Proprietorship)
Schedule attached to Form 1040 used by sole proprietors and single-member LLCs (treated as disregarded entities) to report income, expenses, and net profit or loss from a trade or business.
Who must file: Sole proprietors and owners of single-member LLCs that are disregarded for federal tax purposes, statutory employees in some cases, and certain qualified joint ventures.
Practical overview
Schedule C is the most-audited individual schedule because of historically high error rates around vehicle expenses, home office, meals, and hobby-versus-business classification. Net profit also drives self-employment tax (Schedule SE) and Section 199A QBI eligibility. Maintaining contemporaneous records, not after-the-fact reconstructions, is the single largest factor in surviving an audit.
Practical steps
- Pick the correct principal business activity code and confirm accounting method (cash vs. accrual).
- Separate business and personal accounts; reconcile gross receipts to bank deposits and 1099s.
- Categorize expenses; do not mix capital expenditures into expense lines (use Form 4562 for depreciation).
- Compute home office under simplified or actual method (Form 8829).
- Carry net profit/loss to Form 1040 and to Schedule SE for self-employment tax.
Due-date notes
File with Form 1040 by the individual income tax return due date.
Timing: April 15
Extension reference: Form 4868
Penalty snapshot
Failure-to-file and failure-to-pay penalties apply at the Form 1040 level; accuracy-related penalty under IRC § 6662 may apply to substantial understatements driven by Schedule C errors.
Related citations
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Cited by
Primary sources
- About Schedule C (Form 1040)Verified 2026-05-20
- Instructions for Schedule CVerified 2026-05-20
Important disclaimer
This library is for general tax education only. Always verify filing obligations, due dates, and tax consequences against the cited primary source or with a qualified tax professional.