1099 Subcontractor Tax Calculator
Calculate your self-employment tax (15.3%), federal & state liabilities, and quarterly estimated tax payments. No account or email required.
Your Earnings & Deductions
Form 1040 Schedule CDetailed Tax Breakdown
IRS Estimated Payment Deadlines (1040-ES)
Pay 4 equal vouchersHow 1099 Self-Employment Taxes Work
When you work as a W-2 employee, your employer covers half of your Social Security and Medicare taxes (7.65%) while withholding the other 7.65% from your paycheck. When you receive 1099-NEC income as an independent contractor, freelancer, or gig worker, you are both employer and employee. Therefore, you are responsible for paying the full 15.3% Self-Employment (FICA) Tax on 92.35% of your net Schedule C earnings.
Frequently Asked Questions
What business expenses can I write off to lower my 1099 tax? ▼
Every dollar of business expenses reduces your net earnings subject to both the 15.3% SE tax and income tax. Common write-offs include vehicle mileage (standard IRS rate), computer equipment, software subscriptions, cell phone usage, home office percentage, health insurance premiums, and professional services.
What is the IRS Safe Harbor rule to avoid underpayment penalties? ▼
To avoid penalties when making quarterly payments, you generally must pay at least 90% of your current tax year liability or 100% of the tax shown on your prior year’s return (110% if your prior Adjusted Gross Income was over $150,000).
Is my financial data stored or uploaded to any server? ▼
No. SwiftUtils runs 100% locally in your web browser. No revenue numbers, deduction figures, or personal data ever leave your device.
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