How to File Self-Employment Taxes in 2026: Complete Schedule C Guide

If you earned $400 or more from self-employment in 2025, you must file a federal tax return — even if you owe no income tax. This guide walks through the exact forms, deadlines, and deductions that apply to the 16+ million self-employed Americans filing for tax year 2025.

What counts as self-employment income?

Per the IRS Self-Employed Tax Center, self-employment includes:

• Sole proprietors and single-member LLCs
• Independent contractors (1099-NEC, 1099-K)
• Gig workers (Uber, DoorDash, Upwork, Fiverr)
• Freelance consultants, writers, designers, developers
• Side-hustlers earning $600+ from any platform

If you received a Form 1099-NEC or 1099-K, that income is reportable.

The forms you'll file

1. Form 1040 — your personal return
2. Schedule C — Profit or Loss from Business
3. Schedule SE — Self-Employment Tax
4. Schedule 1 — flows the SE income to your 1040
5. Form 8829 — Home Office (if applicable)
6. Form 4562 — Depreciation (if you bought equipment)

Self-Employment Tax: 15.3%

Self-employment tax = Social Security (12.4%) + Medicare (2.9%). It's calculated on 92.35% of net SE earnings (the SE earnings factor).

For TY2025:

• Social Security portion caps at $176,100 of earnings
• Medicare has no cap, plus an extra 0.9% above $200K (single) / $250K (MFJ)
• You can deduct half of your SE tax as an above-the-line adjustment (Schedule 1, Line 15)

Quarterly estimated payments — Form 1040-ES

If you'll owe $1,000+ in tax, the IRS requires quarterly payments. 2026 deadlines:

Quarter	Income Period	Deadline
Q1	Jan 1 – Mar 31	Apr 15, 2026
Q2	Apr 1 – May 31	Jun 16, 2026
Q3	Jun 1 – Aug 31	Sep 15, 2026
Q4	Sep 1 – Dec 31	Jan 15, 2027

Pay via IRS Direct Pay or EFTPS — both are free.

Top deductions for the self-employed

• Home office — Pub 587 safe-harbor method ($5/sq ft, max $1,500) or actual expenses
• Vehicle — 70¢/mile for 2025 business miles, OR actual expenses
• Health insurance premiums — above-the-line deduction (Schedule 1, Line 17)
• Retirement contributions — SEP-IRA up to 25% of SE income, or Solo 401(k) up to $69K for 2025
• Half of self-employment tax — automatic
• Qualified Business Income (QBI) — 20% deduction under §199A
• Internet, phone, software subscriptions — business-use portion only

How Accountaxed helps

Accountaxed extracts every transaction from your bank statements (PDF, CSV, QBO), categorizes them to Schedule C lines automatically, computes your Schedule SE liability, and tracks quarterly estimate balances throughout the year.

See the Schedule C engine in action →

Disclaimer: This article is general guidance, not tax advice. Consult a CPA or enrolled agent for your specific situation.