Independent contractors typically pay 15.3% in self-employment tax on net earnings plus federal income tax at rates from 10% to 37%, but after deductions and the qualified business income break, the effective bill usually lands around 25% to 30% of net profit. How much you actually owe depends on your profit after expenses, the retirement accounts you fund, whether you qualify for the 20% qualified business income deduction, and the state you live in.
The 15.3% Self-Employment Tax Floor
Every dollar of net profit from contract work gets hit by self-employment tax before income tax even enters the picture. The rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.1Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) W-2 employees pay half those amounts out of pocket because their employer covers the other half. As a contractor, you’re both sides of that equation.
The 12.4% Social Security portion applies only up to the wage base limit, which is $184,500 for 2026.2Social Security Administration. Contribution and Benefit Base Earnings above that ceiling still owe the 2.9% Medicare piece, which has no cap. High earners face one more layer: if self-employment income exceeds $200,000 as a single filer or $250,000 filing jointly, an Additional Medicare Tax of 0.9% applies on the amount above the threshold.3Internal Revenue Service. Topic No. 560, Additional Medicare Tax
Federal Income Tax on Top
After self-employment tax is calculated, your net profit flows into the same progressive income tax system that applies to everyone. Contract earnings, interest, dividends, and side income all pool together to determine which brackets apply. For 2026, single filers face these brackets:
- 10%: up to $12,400
- 12%: $12,401 to $50,400
- 22%: $50,401 to $105,700
- 24%: $105,701 to $201,775
- 32%: $201,776 to $256,225
- 35%: $256,226 to $640,600
- 37%: over $640,600
Married couples filing jointly get wider brackets; the 22% rate, for instance, doesn’t begin until $100,800.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 These are marginal rates: only the income falling inside a bracket is taxed at that bracket’s rate, not the whole return.
Before applying the brackets, you reduce adjusted gross income by the standard deduction: $16,100 for single filers, $32,200 for married filing jointly, or $24,150 for heads of household in 2026.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Itemizing beats the standard deduction for some contractors, particularly those with large mortgage interest or state tax bills, but most people take the standard.
What Net Earnings Actually Means
Self-employment tax doesn’t apply to every dollar you collect. Start with gross revenue, subtract allowable business expenses, and you land on net profit. The IRS then applies a second adjustment: multiply net profit by 92.35% to get the amount actually subject to self-employment tax.5Internal Revenue Service. Topic No. 554, Self-Employment Tax Traditional employers get to deduct the employer share of payroll taxes, so this multiplier is the equivalent break for contractors.
On top of that, you can deduct half of your self-employment tax when calculating adjusted gross income.6Office of the Law Revision Counsel. 26 USC 164 Taxes That doesn’t reduce the self-employment tax itself, but it does lower the income on which federal and state income tax gets calculated.
The 20% Qualified Business Income Deduction
One of the most valuable breaks available is the qualified business income deduction under Section 199A. Sole proprietors, partners, and S corporation shareholders can deduct up to 20% of qualified business income from taxable income.7Internal Revenue Service. Qualified Business Income Deduction The deduction was originally set to expire after 2025, but the One Big Beautiful Bill Act made it permanent and widened the income ranges where limitations phase in.
For 2026, single filers with taxable income below roughly $200,000 (or $400,000 filing jointly) generally receive the full 20% deduction without restrictions. Above those thresholds, limitations tied to wages paid and business property values begin to phase in, and certain service-based businesses such as consultants, lawyers, and accountants face additional restrictions that can shrink or eliminate the deduction. The phase-in range is now $75,000 wide for single filers and $150,000 for joint filers, giving more middle-income contractors access to the full deduction than under prior law.
QBI does not reduce self-employment tax. It only lowers federal income tax. At 20% of qualified income, though, it can be worth thousands. Contractors paid through a C corporation or as W-2 employees don’t qualify, so business structure matters.
Deductions That Shrink the Bill
Your tax bill is only as large as your net profit, so every legitimate business expense you track directly reduces what you owe. The IRS allows deductions for costs that are ordinary and necessary in your line of work, meaning common in your field and useful for running the business.8Office of the Law Revision Counsel. 26 USC 162 Trade or Business Expenses These deductions are reported on Schedule C and cut both income tax and self-employment tax.
Home Office
Use part of your home exclusively and regularly as your principal place of business, and you can deduct a proportional share of rent, mortgage interest, utilities, and insurance.9Internal Revenue Service. Publication 587 (2025), Business Use of Your Home The key word is “exclusively.” A desk in your bedroom that doubles as a vanity doesn’t qualify. The IRS also offers a simplified method: $5 per square foot of dedicated office space, up to 300 square feet, for a maximum of $1,500 per year with no receipts required.10Internal Revenue Service. Simplified Option for Home Office Deduction
Vehicle and Travel
Driving to client sites, job locations, or business meetings generates a deduction. For 2026, the standard mileage rate is 72.5 cents per mile for business use.11Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate You can use the flat rate or track actual vehicle expenses like gas, insurance, maintenance, and depreciation, but not both. Travel away from your home base for business, including airfare, lodging, and 50% of meal costs, is also deductible when properly documented.12Internal Revenue Service. Topic No. 511, Business Travel Expenses
Health Insurance Premiums
Self-employed contractors can deduct premiums paid for medical, dental, and vision insurance covering themselves, their spouse, and dependents. The deduction is reported on Schedule 1 of Form 1040 as an above-the-line deduction, so it reduces adjusted gross income even if you don’t itemize.13Internal Revenue Service. Form 7206 – Self-Employed Health Insurance Deduction The plan must be established under your business, and the deduction can’t exceed net self-employment income from that business.
Retirement Contributions
Retirement accounts simultaneously cut your current tax bill and build long-term savings. Two options stand out for contractors:
- SEP IRA. Contribute up to 25% of net self-employment earnings after the deduction for half of self-employment tax, with a maximum of $72,000 in 2026. Setup is simple and annual filings aren’t required until assets reach certain levels.14Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs)
- Solo 401(k). Defer up to $24,500 as the employee side in 2026, plus make employer profit-sharing contributions of up to 25% of net self-employment earnings, with a combined ceiling of $72,000. If you’re 50 or older, an additional $8,000 catch-up contribution raises the total to $80,000.15Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
The solo 401(k) lets lower-income contractors shelter more because the $24,500 employee deferral doesn’t depend on a percentage of profit. A contractor netting $60,000 could defer $24,500 through a solo 401(k) but only about $11,100 through a SEP IRA at 25% of adjusted earnings.
Equipment and Other Business Costs
Computers, tools, software subscriptions, professional liability insurance, advertising, and office supplies are all deductible when used for business. Large equipment purchases can often be deducted in full the year of purchase under Section 179 expensing rather than depreciated over multiple years. Professional licensing fees, continuing education tied to your current trade, and business-related phone and internet costs fill out the common list.
State Income Tax
State income tax is a separate obligation calculated on roughly the same net profit figure. Rates and structures vary widely: some states use a flat rate, others follow progressive brackets, and a handful impose no income tax at all. Check your specific state’s rules; your combined federal, state, and self-employment rate depends heavily on where you live.
Quarterly Estimated Payments and Safe Harbor
Because no employer withholds taxes from your checks, the IRS expects you to pay as you earn through quarterly estimated payments. You’re required to make them if you expect to owe $1,000 or more for the year after subtracting withholdings and credits.16Internal Revenue Service. Estimated Taxes Most full-time contractors clear that threshold easily. Payments use Form 1040-ES, with four deadlines for the 2026 tax year:17Internal Revenue Service. Form 1040-ES (2026)
- 1st quarter: April 15, 2026
- 2nd quarter: June 15, 2026
- 3rd quarter: September 15, 2026
- 4th quarter: January 15, 2027
Estimating income accurately four times a year is hard when contract work is unpredictable. The IRS safe harbor rules protect you from underpayment penalties: pay at least the smaller of 90% of the tax you owe for the current year or 100% of the tax shown on your prior year’s return, and no penalty applies.18Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty If your adjusted gross income the prior year exceeded $150,000 (or $75,000 if married filing separately), the 100% threshold jumps to 110%. For a growing business, basing payments on 110% of last year’s liability and settling up at filing time is the safest path.
A Worked Example
A single contractor who collects $120,000 in gross revenue and claims $20,000 in business expenses has a net profit of $100,000. Self-employment tax applies to 92.35% of that profit, or $92,350, producing a self-employment tax of roughly $14,130 at 15.3%.5Internal Revenue Service. Topic No. 554, Self-Employment Tax Half of that, about $7,065, comes off adjusted gross income. After the $16,100 standard deduction and a QBI deduction of up to 20% of qualified income, taxable income drops further, and federal income tax is calculated on whatever remains using the progressive brackets. The combined effective rate in this scenario lands somewhere around 25% to 30% of net profit, depending on the exact QBI calculation and any additional deductions like retirement contributions.
That effective rate is the number most contractors actually care about, and it’s almost always lower than the sum of the headline rates suggests, because deductions, the 92.35% adjustment, and the QBI deduction all chip away at the taxable base before the rates apply. The contractors who pay the least attention to deductions and estimated payments are the ones who end up owing the most in April.