If you work for yourself in Florida, the self-employment tax you owe is the federal 15.3% that funds Social Security and Medicare, applied to 92.35% of your net earnings once those earnings reach $400 for the year.1Internal Revenue Service. Topic No. 554, Self-Employment Tax Florida itself imposes no personal income tax, so there is no separate state self-employment tax to calculate, file, or pay. Your entire obligation runs through the IRS.
How the 15.3% Rate Breaks Down
The self-employment tax has two pieces. A 12.4% portion funds Social Security, and a 2.9% portion funds Medicare.2Office of the Law Revision Counsel. 26 U.S. Code 1401 – Rate of Tax A W-2 employee splits those costs with an employer, each paying 7.65%. When you work for yourself, you cover both halves.
The Social Security piece only applies up to an annual earnings cap. For the 2026 tax year, that cap is $184,500.3Social Security Administration. Contribution and Benefit Base Earnings above the cap escape the 12.4%, but the 2.9% Medicare tax has no ceiling and applies to every dollar of net self-employment income.
Additional Medicare Tax at Higher Incomes
An extra 0.9% Medicare surtax kicks in on net earnings above these thresholds, which are not indexed for inflation and have not changed since 2013:
- Single or head of household: $200,000
- Married filing jointly: $250,000
- Married filing separately: $125,000
The surtax only applies to the amount above the threshold.4Internal Revenue Service. Topic No. 560, Additional Medicare Tax A single filer with $260,000 in net self-employment income owes the extra 0.9% on $60,000, which is $540.
The 92.35% Adjustment
You do not pay 15.3% on your full net profit. First you multiply net earnings by 92.35%, and then you apply the tax rates.1Internal Revenue Service. Topic No. 554, Self-Employment Tax The adjustment accounts for the fact that W-2 workers do not pay FICA on their employer’s share of the contribution.
Say your Schedule C shows $80,000 in net profit. Multiply by 0.9235 to get $73,880. Apply 15.3% to that figure, not to the original $80,000, and your self-employment tax comes out to roughly $11,304 instead of $12,240.
Deductions That Reduce What You Owe
Half of Your Self-Employment Tax
Federal law lets you deduct half of your self-employment tax from your gross income.5Office of the Law Revision Counsel. 26 U.S. Code 164 – Taxes The deduction appears on Schedule 1 of Form 1040 (line 15 for the 2025 form) and lowers your adjusted gross income. It does not reduce the self-employment tax itself. On that $80,000 example, the $11,304 tax yields a $5,652 deduction against gross income.
Business Expenses on Schedule C
Every legitimate business expense you report on Schedule C reduces net profit, and that reduces both your income tax and your self-employment tax. Advertising, supplies, software subscriptions, business vehicle use, and office rent are standard entries.6Internal Revenue Service. Schedule C (Form 1040) 2025 – Profit or Loss From Business The simplified home office deduction allows $5 per square foot up to 300 square feet, capped at $1,500, when you use part of your home exclusively and regularly for business.7Internal Revenue Service. Simplified Option for Home Office Deduction
Self-Employed Health Insurance
If you pay your own health insurance premiums and are not eligible for coverage through a spouse’s employer, you can deduct the premiums above the line. The deduction covers you, your spouse, your dependents, and children under 27.8Internal Revenue Service. Instructions for Form 7206 (2025)
The QBI Deduction Expired After 2025
The Qualified Business Income deduction under Section 199A, which let many self-employed taxpayers deduct up to 20% of qualified business income, applied only to tax years beginning after December 31, 2017, and ending on or before December 31, 2025.9Internal Revenue Service. Qualified Business Income Deduction Unless Congress extends or replaces it, QBI is not available for 2026. That makes capturing every other deduction more important.
How to File: Schedule C, Schedule SE, Form 1040
Schedule C is where you report gross receipts and subtract business expenses to arrive at net profit on line 31. File a separate Schedule C for each self-employed business you run.6Internal Revenue Service. Schedule C (Form 1040) 2025 – Profit or Loss From Business
That net profit flows to Schedule SE. Line 4a applies the 92.35% adjustment. Line 10 applies the 12.4% Social Security rate to the lesser of your adjusted earnings or the wage base cap. Line 11 applies the 2.9% Medicare rate to all adjusted earnings. Line 12 is your total self-employment tax.10Internal Revenue Service. 2025 Schedule SE (Form 1040)
From there, the self-employment tax total transfers to Schedule 2 of Form 1040, and the deduction for half of that tax lands on Schedule 1, line 15.11Internal Revenue Service. 2025 Schedule 1 (Form 1040) Both figures feed into your Form 1040 alongside any other income, deductions, and credits.
Quarterly Estimated Payments
Self-employed workers do not have withholding, so the IRS expects payments four times a year. You generally need to make estimated payments if you expect to owe at least $1,000 in federal tax after withholding and refundable credits.12Internal Revenue Service. Topic No. 306, Penalty for Underpayment of Estimated Tax
- April 15, covering January through March
- June 15, covering April through May
- September 15, covering June through August
- January 15, covering September through December
When a deadline falls on a weekend or federal holiday, it shifts to the next business day.13Internal Revenue Service. Individuals 2 IRS Direct Pay and the Electronic Federal Tax Payment System (EFTPS) both pull directly from a bank account and give you confirmation.14Internal Revenue Service. Payments Form 1040-ES includes a worksheet for figuring each payment.15Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals
Safe Harbors That Prevent Penalties
Underpayment penalties are calculated on the shortfall, how long it was outstanding, and the current quarterly interest rate.16Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty You avoid them entirely by meeting any one of three safe harbors:
- Your total tax after withholding and credits comes to less than $1,000 at filing.
- Your payments and withholding cover at least 90% of what you owe for the current year.
- Your payments cover 100% of last year’s total tax, rising to 110% if your prior-year AGI exceeded $150,000 ($75,000 if married filing separately).
The prior-year method is useful when income swings. If last year’s tax was $8,000, paying $2,000 per quarter keeps you penalty-safe even if this year’s income climbs sharply. You will still owe the difference at filing time, but no penalty attaches.17Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
Late Filing and Late Payment Penalties
The failure-to-file penalty is 5% of unpaid tax for each month or partial month a return is late, up to 25%.18Internal Revenue Service. Failure to File Penalty The failure-to-pay penalty is smaller but also caps at 25% of unpaid tax.19Internal Revenue Service. Failure to Pay Penalty Interest runs on top of both. If you cannot pay in full, file on time and pay what you can; the filing penalty alone is five times the payment penalty.
Florida Obligations Beyond Income Tax
Florida’s constitution bars the state from imposing a personal income tax, which is why there is no state self-employment tax calculation. The protection does not cover other state and local requirements that may still reach your business.
Local Business Tax Receipts
Many Florida counties and cities require a local business tax receipt (once called an occupational license) before you operate. Fees vary by jurisdiction and business type, from under $50 to several hundred dollars, and most renew annually. Your county tax collector handles the specifics.
Sales Tax on Goods and Certain Services
Florida’s general sales tax rate is 6%. Most services are exempt, but some categories are taxable, including nonresidential cleaning, pest control, and detective or security services.20Florida Department of Revenue. Florida Sales and Use Tax If you sell tangible goods, you almost certainly need to register with the Florida Department of Revenue, collect sales tax, and remit it on schedule.
Reemployment Tax
Florida’s reemployment tax does not apply to a sole proprietor’s own earnings. Services performed by a sole proprietor or partner are explicitly exempt.21Florida Department of Revenue. Florida Reemployment Tax That changes once you hire employees, at which point liability begins when quarterly payroll reaches $1,500 or you have at least one employee during 20 weeks in a calendar year.
Keep Your Records
Keep tax records for at least three years from the date you file the return. If you underreport income by more than 25%, that window stretches to six years.22Internal Revenue Service. How Long Should I Keep Records Receipts, invoices, bank statements, and mileage logs all matter. Organized records both protect you in an audit and make sure every deduction you are entitled to actually gets claimed.