US Self-Employed Tax Guide: Schedule C, SE Tax & Estimated Payments
Self-employed individuals in the United States generally report business income and expenses on their federal return and may owe income tax plus self-employment tax. State and local rules can also apply. Bookkeeping and estimated payments help avoid an unexpected balance.
Report business profit and deductions
Sole proprietors commonly use Schedule C to report business profit or loss. Reconcile gross receipts, refunds, platform fees and inventory. Ordinary and necessary business costs may be deductible when IRS rules are met; personal expenses are not, and mixed-use costs must be allocated. Vehicles, equipment, home offices and inventory have special rules, so consult current IRS instructions before claiming large or complex amounts.
Self-employment tax and estimated payments
Net profit generally flows to the individual return and can be subject to federal income tax and self-employment tax for Social Security and Medicare, subject to rules and annual limits. W-2 wages can affect the calculation. Federal tax is pay-as-you-go: estimated payments may be required when withholding and credits will not cover enough of the expected liability. State income tax, sales tax, payroll obligations and business licenses are separate from federal income tax.
| Purpose | Common form |
|---|---|
| Business profit or loss | Schedule C (Form 1040) |
| Self-employment tax | Schedule SE |
| Estimated tax planning | Form 1040-ES |
| Annual individual return | Form 1040 |
Practical checklist
- Reconcile gross receipts to invoices, bank deposits and payment processors.
- Keep business and personal spending separate and retain expense evidence.
- Track vehicle, home office, inventory and equipment under IRS rules.
- Estimate both federal income tax and self-employment tax through the year.
- Check current estimated payment dates and state or local obligations.
General information only, not personal tax advice. Check current official guidance for the relevant tax year or consult a qualified professional.