Self-Employment Tax Guide: Forms You Need
If you work for yourself - whether as a freelancer, independent contractor, sole proprietor, or gig worker - you are responsible for paying self-employment (SE) tax in addition to regular income tax. Self-employment tax covers the Social Security and Medicare contributions that would normally be split between an employee and their employer. This guide explains how SE tax works, how to calculate it, and which forms you need to stay compliant with the IRS.
What Is Self-Employment Tax?
Self-employment tax is the Social Security and Medicare tax that self-employed individuals pay on their net earnings. When you work as an employee, your employer pays half of these FICA taxes (7.65%) and withholds the other half from your paycheck. When you are self-employed, you pay both halves - a combined rate of 15.3%. The self-employment tax is calculated on Schedule SE and reported on your Form 1040.
- Social Security portion: 12.4% on net earnings up to the wage base ($184,500 in 2026)
- Medicare portion: 2.9% on all net earnings with no cap
- Additional Medicare Tax: 0.9% on net SE earnings above $200,000 (single) or $250,000 (married filing jointly)
- Total SE tax rate: 15.3% on the first $184,500, then 2.9% (or 3.8%) above that
Who Must Pay Self-Employment Tax?
You must pay self-employment tax if your net earnings from self-employment are $400 or more in a tax year. This applies to sole proprietors, independent contractors, freelancers, gig economy workers, and general partners in a partnership. It also applies if you have a side business in addition to a regular W-2 job - your SE tax obligation is based on your self-employment income alone.
- Freelancers and independent contractors who receive 1099-NEC forms
- Sole proprietors who operate a business (with or without a DBA)
- General partners in a partnership
- Gig workers (rideshare drivers, delivery couriers, freelance platforms)
- Side-business owners who earn $400 or more from self-employment
- Members of an LLC that is taxed as a sole proprietorship or partnership
Calculating Self-Employment Tax
To calculate SE tax, start with your net self-employment earnings from Schedule C (gross income minus business expenses). Multiply that amount by 92.35% (0.9235) to get your tax base - this adjustment accounts for the employer-equivalent portion of FICA that employees don't pay on. Then apply the 15.3% SE tax rate to that base. You can deduct the employer-equivalent half of SE tax (7.65%) as an above-the-line deduction on your 1040, reducing your adjusted gross income.
- Step 1: Calculate net profit on Schedule C (total revenue minus business expenses)
- Step 2: Multiply net profit by 92.35% to get the SE tax base
- Step 3: Apply 12.4% Social Security tax on the base up to the wage base limit
- Step 4: Apply 2.9% Medicare tax on the entire base (no limit)
- Step 5: Add the Additional Medicare Tax of 0.9% if the base exceeds $200,000
- Step 6: Deduct half of the SE tax as an adjustment to income on Form 1040 Line 15
Quarterly Estimated Tax Payments
Because self-employed individuals do not have an employer withholding taxes, the IRS requires them to make estimated tax payments throughout the year using Form 1040-ES. Payments are due four times a year and should cover both income tax and self-employment tax. Failing to make sufficient estimated payments can result in an underpayment penalty calculated on Form 2210.
- Q1 payment due: April 15 (covers income earned January through March)
- Q2 payment due: June 15 (covers income earned April through May)
- Q3 payment due: September 15 (covers income earned June through August)
- Q4 payment due: January 15 of the following year (covers income earned September through December)
- Safe harbor: pay at least 100% of last year's tax (110% if AGI exceeded $150,000) to avoid penalties
- Payments can be made via IRS Direct Pay, EFTPS, or by mailing a check with a 1040-ES voucher
Essential Forms for the Self-Employed
Self-employed individuals must file several IRS forms to report their income, calculate their tax, and claim deductions. The main forms are your individual return (Form 1040), the business profit and loss schedule (Schedule C), and the self-employment tax calculation (Schedule SE). Depending on your situation, you may also need forms for estimated payments, hiring employees, or retirement plan contributions.
- Form 1040 - the individual income tax return where all income and deductions are summarized
- Schedule C (Form 1040) - reports profit or loss from a sole proprietorship or single-member LLC
- Schedule SE (Form 1040) - calculates the self-employment tax owed
- Form 1040-ES - voucher for making quarterly estimated tax payments
- 1099-NEC - received from clients who paid you $600 or more; you must report all income even if no 1099 is received
- Form SS-4 - used to apply for an EIN if you hire employees or form a business entity
- Form 941 - filed quarterly by self-employed individuals who have employees, to report payroll taxes withheld
- Schedule R or Form 8829 - for claiming the home office deduction if you use part of your home exclusively for business
Deductions for the Self-Employed
Self-employed workers can deduct legitimate business expenses to reduce their net earnings, which in turn lowers both income tax and self-employment tax. These deductions are reported on Schedule C. Additionally, there are several above-the-line deductions available specifically to self-employed individuals, including the deductible half of SE tax and self-employed health insurance premiums.
- Home office deduction - simplified method ($5/sq ft up to 300 sq ft) or actual expenses method
- Business supplies and equipment - computers, software, office furniture, and tools
- Vehicle expenses - the IRS standard mileage rate, which is reset each year, or actual expenses
- Health insurance premiums - deductible as an adjustment to income if you are not eligible for an employer plan
- Retirement contributions - SEP IRA (up to 25% of net earnings), SIMPLE IRA, or Solo 401(k)
- Professional services - accounting, legal, and consulting fees
- Marketing and advertising - website hosting, domain names, business cards, online ads
- Half of self-employment tax - deducted on Form 1040 as an adjustment to gross income