Self-employment tax: how it works
When you work as a 1099 contractor, you're self-employed in the eyes of the IRS. That means you pay self-employment (SE) tax — the equivalent of both the employee and employer halves of Social Security and Medicare taxes. W-2 employees pay 7.65% while employers pay a matching 7.65%. As a 1099 worker, you pay the full 15.3% yourself.
The 2026 SE tax calculation: multiply your net self-employment income by 0.9235 (92.35% — this accounts for the deductible employer-equivalent half), then apply the 15.3% rate. The Social Security portion (12.4%) applies only on earnings up to the wage base of $168,600; above that, only the 2.9% Medicare portion continues. An additional 0.9% Medicare surtax applies on SE income above $200,000 (single) or $250,000 (married filing jointly).
The silver lining: you can deduct 50% of your SE tax from gross income as an above-the-line deduction (on Schedule 1 of Form 1040). This reduces your federal income tax but not the SE tax itself.
Quarterly estimated tax payments (2026)
The IRS does not allow 1099 workers to pay taxes once a year. You must make quarterly estimated payments if you expect to owe $1,000 or more. Failing to pay quarterly results in an underpayment penalty plus interest — currently ~8% annualized on the shortfall.
| Quarter | Income Covered | Due Date |
|---|---|---|
| Q1 2026 | Jan 1 – Mar 31 | April 15, 2026 |
| Q2 2026 | Apr 1 – May 31 | June 16, 2026 |
| Q3 2026 | Jun 1 – Aug 31 | September 15, 2026 |
| Q4 2026 | Sep 1 – Dec 31 | January 15, 2027 |
The safest method: pay at least 110% of your prior year's total tax liability spread across four equal payments (the "safe harbor" method). This eliminates the underpayment penalty even if your current year income is higher. Alternatively, pay 90% of your actual current year liability — but this requires accurate income forecasting throughout the year.
Key deductions for 1099 workers
Deductions are the most powerful tool to legally reduce your 1099 tax burden. Unlike W-2 employees who are limited to the standard deduction for most purposes, self-employed workers deduct legitimate business expenses directly from self-employment income before calculating either SE tax or income tax:
- Half of SE tax: 50% of your calculated SE tax is deductible above-the-line — automatic, requires no documentation. This is the first deduction every 1099 worker should take.
- Self-employed health insurance: 100% of health, dental, and vision insurance premiums paid for yourself and your family are deductible (subject to net profit limitation). This is one of the largest deductions available to many self-employed workers.
- Home office: If you use a dedicated space exclusively and regularly for business, deduct either $5 per square foot (simplified method, max 300 sq ft = $1,500) or the actual percentage of home costs (rent/mortgage interest, utilities, insurance) attributable to the office space.
- Retirement contributions: SEP-IRA: up to 25% of net self-employment income, maximum $70,000 in 2026. Solo 401(k): up to $23,500 employee contribution + 25% of net earnings employer contribution, combined max $70,000. These contributions reduce both federal income tax and state income tax — not SE tax.
- Business equipment and software: Computers, phones, cameras, software subscriptions, and other equipment used for business. Deduct via Section 179 (immediate full deduction) or bonus depreciation in the year of purchase.
- Vehicle: Business use of your vehicle at $0.70/mile (2026 standard mileage rate) or actual expenses multiplied by the business-use percentage. Keep a mileage log.
- Professional development: Courses, books, conferences, certifications — any education that maintains or improves skills in your current trade.
- Marketing and business development: Website, advertising, proposal software, professional portfolio platforms, and networking costs are deductible.
The QBI deduction (Section 199A)
The Qualified Business Income (QBI) deduction — introduced under the 2017 Tax Cuts and Jobs Act — allows eligible self-employed workers to deduct up to 20% of qualified business income from federal taxable income. For a contractor with $80,000 in net QBI, this can mean an $16,000 deduction, saving roughly $3,500+ in federal income tax at a 22% marginal rate.
Key limits for 2026: The QBI deduction begins phasing out for single filers with taxable income above $197,300 and married filers above $394,600. For "specified service trade or businesses" (SSTPBs — which includes consulting, health, law, accounting, financial services, and performing arts), the deduction phases out completely once income exceeds the threshold by $50,000 (single) or $100,000 (married). Engineering and architecture are explicitly excluded from the SSTB category.
Important: The QBI deduction is currently scheduled to expire after December 31, 2025. Congressional extension is widely expected but not guaranteed as of this writing. Consult your tax professional for current status.
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What percentage to set aside from each payment
Every time you receive a 1099 payment, move a fixed percentage to a dedicated tax savings account immediately. This prevents the painful cash-flow shock of a large quarterly payment. Common guidance by income level:
| Net SE Income (Single) | Approx. SE Tax | Approx. Federal Income Tax | Suggested Set-Aside |
|---|---|---|---|
| $30,000 | ~$4,239 | ~$1,250 (10-12%) | 20–22% |
| $60,000 | ~$8,478 | ~$5,100 (22%) | 25–27% |
| $100,000 | ~$14,130 | ~$13,400 (22-24%) | 27–30% |
| $150,000 | ~$19,600 | ~$23,000 (24-32%) | 29–32% |
| $200,000+ | ~$24,000+ | ~$35,000+ (32-35%) | 30–35% |
These estimates assume standard deduction and no significant additional deductions. Aggressive use of RRSP/SEP-IRA, home office, and other deductions will significantly lower actual liability.
Frequently asked questions
What is the self-employment tax rate for 2026?
15.3% on net self-employment income up to $168,600, then 2.9% on income above that (Medicare only — Social Security stops). An additional 0.9% Medicare surtax applies on income above $200,000 (single) or $250,000 (married). You calculate SE tax on 92.35% of net self-employment income (not the full amount), because IRS allows you to exclude the employer-equivalent half from the base.
Do I have to pay quarterly estimated taxes?
Yes, if you expect to owe $1,000 or more in taxes when filing. The 2026 due dates are April 15, June 16, September 15, and January 15, 2027. Pay at least 110% of prior year tax liability (safe harbor) to avoid underpayment penalties. Use IRS Form 1040-ES to calculate and submit quarterly payments via IRS Direct Pay online.
What expenses can I deduct as a 1099 contractor?
Any ordinary and necessary business expense: home office (dedicated space), health insurance premiums (100% above-the-line), retirement contributions (SEP-IRA, Solo 401k), business equipment and software, vehicle mileage ($.70/mi in 2026), professional development, marketing, accounting fees, and professional liability insurance. Keep receipts for everything — the IRS expects substantiation for any business deduction claimed on Schedule C.
What is the QBI deduction and do I qualify?
The Section 199A QBI deduction lets eligible self-employed workers deduct up to 20% of qualified business income from federal taxable income. For 2026, it phases out for single filers above $197,300. Service businesses (consulting, law, health, finance, accounting) face additional income limitations and may be fully phased out above the threshold. The deduction is scheduled to expire after 2025 — verify current status with your tax professional or the IRS website.
How much should I set aside from 1099 payments for taxes?
A safe starting point: 28–30% of every payment goes immediately to a dedicated tax savings account. This covers SE tax (~14% of net SE income) plus federal income tax (22–24% marginal for most contractors). If your state has income tax, add that rate on top. Refine this percentage once you have a clearer picture of your annual income and deductions. Never touch the tax savings account for anything other than quarterly payments and year-end tax bills.