Contractor Rate Calculator

Unlike employees who have taxes withheld from each paycheck, contractors must calculate and send tax payments four times per year. This includes both income tax and self-employment tax. The IRS expects you to pay at least 90% of your current year tax (or 100% of last year's tax) through estimated payments to avoid penalties. Many contractors set aside 25-30% of each payment received into a separate account for taxes.

A common mistake when calculating contractor rates is assuming 40 billable hours per week, 52 weeks per year (2,080 hours). In reality, contractors lose time to: unpaid vacation and sick days (2-4 weeks), administrative work (5-10 hours/week), business development and marketing (2-5 hours/week), and gaps between contracts. A realistic estimate is 1,500-1,800 billable hours per year for most independent contractors.

The calculator estimates your marketplace health insurance cost using the Affordable Care Act (ACA) subsidy formula based on your projected contractor income. Bronze plans with Health Savings Account (HSA) eligibility are a common strategy for healthy contractors who want lower premiums and tax-advantaged savings. Health insurance is often the single largest new expense when leaving employment, because employer plans typically cover 79% of the premium cost that you must now pay in full.

When you're employed, you see 7.65% withheld from your paycheck for FICA, and your employer quietly pays another 7.65% on your behalf. As a self-employed contractor, you pay both halves — the full 15.3%. However, you can deduct the employer-equivalent portion (7.65%) when calculating your adjusted gross income, which reduces your income tax slightly. An additional 0.9% Medicare tax applies to earnings above $200,000 for single filers.

As an employee earning $120,000, your employer pays ~$9,180 in Federal Insurance Contributions Act (FICA) taxes, employer-provided health insurance worth $7,400 (national average for single coverage), $4,800 in 401(k) matching, and gives you 20+ days of paid leave worth ~$9,200. That's over $35,000 in hidden compensation. As a contractor, you pay all of this yourself from your hourly rate, plus business expenses like liability insurance, accounting, and equipment.