The split
W-2 employees see federal tax, FICA, state tax and benefits taken out of every paycheck. The employer pays the employer-side FICA (6.2 percent SS plus 1.45 percent Medicare) on top, and usually subsidizes health insurance, 401(k) match, paid time off, unemployment insurance and workers' comp.
1099 contractors are self-employed. Nothing is withheld from gross receipts. You owe income tax plus self-employment tax (12.4 percent SS plus 2.9 percent Medicare equals 15.3 percent combined) on net earnings. You pay quarterly via Form 1040-ES estimated taxes. No employer benefits.
Self-employment tax in detail
You pay both halves of FICA, capped on the Social Security half by the same wage base ($184,500 for 2026, verify current). Plus 0.9 percent Additional Medicare above $200k single. You can deduct half of SE tax above the line on your federal return.
Retirement and benefits as a contractor
SEP-IRA, Solo 401(k) and SIMPLE IRA give you higher contribution limits than employee 401(k). You can deduct self-employed health insurance premiums above the line. Track every business expense you can substantiate.
Misclassification
If your employer treats you as a contractor but the work pattern looks like an employee, you may be misclassified. The IRS tests behavioral, financial and relationship control. Form SS-8 starts an IRS determination.