For 1099 independent contractors estimating their tax burden
Calculate your total tax obligation as a 1099 contractor including self-employment tax and federal income tax. See your quarterly estimated payment amounts to avoid IRS penalties.
Total Tax Owed
$22.6K
Quarterly Payment
$5.64K
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Net Income = Gross - Expenses; SE Tax = Net × 0.9235 × 15.3%; Taxable Income = Net - (SE Tax × 50%) - Std Deduction; Total Tax = SE Tax + Federal Income Tax
Calculates self-employment tax on 92.35% of net income, then adds federal income tax after deducting half of SE tax and the standard deduction. Quarterly payments are total tax divided by 4.
As a 1099 contractor, you're responsible for both the employee and employer portions of Social Security and Medicare taxes - a combined 15.3% on top of income tax. This is often a surprise for new freelancers.
Unlike W-2 employees who have taxes withheld, 1099 contractors must pay estimated taxes quarterly. Missing these payments triggers IRS penalties. The safe harbor requires paying at least 90% of current year taxes or 100% of prior year taxes (110% if AGI > $150K).
Strategic expense tracking is crucial. Every deductible expense reduces both your SE tax and income tax. Common deductions include home office, business equipment, software, professional development, and health insurance premiums.
Software developer with $120,000 gross 1099 income
SE Tax: ~$14,800, Federal Income Tax: ~$13,500, Total: ~$28,300, Quarterly: ~$7,075
Consultant with side income of $40,000
SE Tax: ~$5,230, Federal Income Tax varies by other income, Quarterly: varies
SE tax is 15.3% (12.4% Social Security + 2.9% Medicare) on 92.35% of your net self-employment income. Social Security applies only up to the wage base ($176,100 in 2025). You can deduct half of SE tax when calculating income tax.
Quarterly payments are due: April 15 (Q1), June 15 (Q2), September 15 (Q3), and January 15 of the following year (Q4). If a due date falls on a weekend or holiday, the deadline is the next business day.
Common deductions include: home office, business equipment and software, professional services, business travel, vehicle expenses, health insurance premiums (if self-employed), retirement contributions, professional development, and business portion of phone/internet.
Calculate your home office tax deduction using the simplified ($5/sq ft) or regular method. See your potential deduction based on office size and expenses.
Calculate your self-employment tax (Social Security + Medicare) as a sole proprietor, freelancer, or single-member LLC. Not for S-Corps or C-Corps.
Compare the standard mileage rate (67¢/mile) vs actual expense method to maximize your vehicle tax deduction. See which method saves you more.
Calculate your federal quarterly estimated tax payments. Includes Schedule C self-employment income, W-2 withholding, safe harbor rules, and quarterly payment schedule.
Calculate your federal income tax using 2025 tax brackets. See your marginal rate, effective rate, and tax owed for any filing status.