Independent contractors pay a 15.3% self-employment tax on their net earnings, plus federal income tax at rates ranging from 10% to 37% depending on their total taxable income. That self-employment tax is what catches most new contractors off guard, because it covers both the employer and employee portions of Social Security and Medicare that a traditional employer would split with you.
How Self-Employment Tax Works
When you work as an employee, your employer pays half of your Social Security and Medicare taxes, and you pay the other half through payroll withholding. As an independent contractor, you’re responsible for the full amount. The 15.3% self-employment tax breaks down into two pieces: 12.4% for Social Security and 2.9% for Medicare.
The Social Security portion applies only up to a wage base that the IRS adjusts annually. Once your earnings exceed that cap, you stop paying the 12.4% Social Security piece on additional income. The 2.9% Medicare portion, however, has no cap. You pay it on every dollar of net self-employment income.
If your earnings are high enough, you’ll also owe an additional 0.9% Medicare tax. This kicks in when your self-employment income (combined with any W-2 wages) exceeds $200,000 for single filers or $250,000 for married couples filing jointly. That brings your effective Medicare rate to 3.8% on income above those thresholds.
Federal Income Tax on Top
Self-employment tax is separate from your federal income tax. After calculating your net business profit on Schedule C, that income flows onto your personal tax return and gets taxed at the same graduated rates that apply to everyone. The current brackets are 10%, 12%, 22%, 24%, 32%, 35%, and 37%. Your rate depends on how much total taxable income you have after deductions, not just your contractor earnings.
For context, a single independent contractor who nets $60,000 in profit would fall partially into the 22% bracket after taking the standard deduction. Combined with the 15.3% self-employment tax, the total effective tax burden on that income is significantly higher than what an employee earning the same gross pay would see on their paycheck.
Two Deductions That Lower Your Bill
The tax code offers two important breaks that reduce what you actually owe. The first is the deduction for the employer-equivalent portion of your self-employment tax. You can deduct half of your self-employment tax (7.65%) from your gross income when calculating your adjusted gross income. This doesn’t reduce your self-employment tax itself, but it lowers the income that gets hit by federal income tax. You claim this deduction whether or not you itemize.
The second is the Qualified Business Income (QBI) deduction, which lets eligible self-employed taxpayers deduct up to 20% of their qualified business income. If you net $80,000 as an independent contractor, this deduction could reduce the income subject to federal income tax by $16,000. The deduction is available regardless of whether you itemize or take the standard deduction, and it has been made permanent for tax years beginning after 2025.
The QBI deduction does come with limitations at higher income levels. Once your taxable income reaches certain thresholds, the deduction may be reduced or eliminated depending on the type of business you operate, the W-2 wages your business pays, and the value of property used in the business. For most independent contractors earning under those thresholds, the full 20% deduction applies.
A Quick Tax Estimate
To see these pieces working together, consider a single independent contractor with $75,000 in net business profit and no other income:
- Self-employment tax: $75,000 × 15.3% = roughly $11,475
- Deductible half of SE tax: About $5,738, which reduces adjusted gross income to roughly $69,262
- QBI deduction: 20% of $75,000 = $15,000
- Standard deduction: $15,750 for a single filer
- Taxable income: Approximately $38,512, which puts a portion in the 12% bracket and a portion in the 22% bracket
- Estimated federal income tax: Roughly $4,400
- Total federal tax (income + SE): Approximately $15,875, or about 21% of gross profit
This doesn’t include state income taxes, which vary widely and can add anywhere from 0% to over 13% depending on where you live.
Quarterly Estimated Tax Payments
Unlike employees who have taxes withheld from each paycheck, independent contractors must pay taxes throughout the year by making quarterly estimated payments. You’re required to do this if you expect to owe $1,000 or more in tax when you file your return.
The four quarterly deadlines fall in April, June, September, and January of the following year. Each payment should cover roughly one quarter of your expected annual tax liability, including both income tax and self-employment tax. You can calculate your estimated payments using IRS Form 1040-ES.
Missing these payments or paying too little triggers a penalty, even if you’re owed a refund when you eventually file. You can generally avoid the penalty by paying at least 90% of the current year’s tax bill through your quarterly payments, or 100% of what you owed for the prior year, whichever is smaller.
Business Expenses Reduce Your Taxable Profit
Your tax rate matters, but so does the number it applies to. Independent contractors pay taxes on net profit, not gross income. That means every legitimate business expense you deduct on Schedule C directly reduces the income subject to both self-employment tax and income tax.
Common deductible expenses include software subscriptions, office supplies, a portion of your home used exclusively for business, mileage or vehicle expenses for business travel, health insurance premiums, professional development, and marketing costs. Tracking these throughout the year rather than scrambling at tax time can make a meaningful difference. A contractor who earns $90,000 but has $15,000 in business expenses pays taxes on $75,000, saving roughly $2,300 in self-employment tax alone plus additional income tax savings.
Keeping clean records and separating business and personal finances with a dedicated bank account makes this process far simpler and provides documentation if the IRS ever questions your deductions.