Calculate self-employment tax, quarterly payments, and take-home pay for independent contractors
Deductible expenses reduce self-employment income
Spouse income, W-2, interest, etc.
SEP-IRA, Solo 401k, SIMPLE IRA — reduces taxable income
Self-employment tax (SE tax) is the contractor's version of FICA — Social Security and Medicare taxes. When you are an employee, your employer pays half (7.65%) and you pay half (7.65%). As a self-employed person, you pay both sides: 15.3% on your net self-employment income. This is in addition to income tax, making the total tax burden on self-employed individuals significantly higher than most people expect.
There is a silver lining: the IRS allows you to deduct 50% of your self-employment tax from your gross income. This does not reduce your SE tax — but it does reduce your taxable income for federal income tax purposes. On $70,000 of SE income, you might pay $9,600 in SE tax and then deduct $4,800 from your income tax calculation, saving roughly $1,000 in additional income tax.
Unlike employees who have taxes withheld automatically, self-employed individuals must pay estimated taxes quarterly using Form 1040-ES. Miss a payment and you owe an underpayment penalty — currently around 7% annual interest on the shortfall. The safest approach is to pay 110% of last year's total tax liability in quarterly installments (the safe harbor rule), which completely eliminates underpayment penalties regardless of your actual income this year.
Retirement contributions reduce your taxable income for federal and state purposes but do not reduce SE tax (which is calculated on net SE income before retirement deductions). The most tax-efficient retirement account for self-employed individuals is a SEP-IRA (up to 25% of net SE income, max $69,000 in 2024) or a Solo 401(k) (up to $23,000 employee deferral + 25% employer contribution).
What is the self-employment tax rate?
The SE tax rate is 15.3%: 12.4% for Social Security (up to the wage base, $168,600 in 2024) plus 2.9% for Medicare (no wage cap). High earners pay an additional 0.9% Medicare surtax on income above $200,000 (single) or $250,000 (married). SE tax is calculated on 92.35% of your net self-employment income, not 100%.
Can I reduce my self-employment tax legally?
Maximize deductible business expenses to reduce net SE income. Consider an S-corp election if you are earning more than $60,000–$70,000 net — with an S-corp, you pay yourself a reasonable salary (subject to payroll tax) and take the rest as distributions (not subject to SE tax). The S-corp route has compliance overhead but can save significant amounts at higher income levels.
What counts as a deductible business expense?
Business expenses that are ordinary and necessary for your trade reduce your net SE income. For contractors: tools and equipment, vehicle expenses (actual or mileage), business insurance, professional development, software subscriptions, phone (business portion), marketing, accountant fees, home office (if dedicated space), subcontractor payments, and materials.
When do I need to make quarterly payments?
If you expect to owe $1,000 or more in federal tax for the year, you should make quarterly estimated payments. Due dates are typically April 15, June 15, September 15, and January 15. Most states have parallel quarterly estimated tax requirements. Check your state's specific rules and deadlines.
Does SE tax apply to all self-employment income?
SE tax applies to net income from a trade or business you operate as a sole proprietor or partnership. It does not apply to: rental income (generally), interest, dividends, capital gains, or income as a limited partner. Some types of income have complex rules — consult a tax professional if you have multiple income streams.
Join thousands of service professionals who find steady landlord clients on VerticalRent. No bidding wars — just direct connections with property owners.
Join as a Vendor