Self-Employment Tax Calculator

Calculate your 15.3% Social Security and Medicare self-employment taxes, 50% AGI tax deduction, and quarterly estimated IRS tax payment schedule.

Income & Entity Parameters

$
$
Total Annual Self-Employment Tax
$8,478/ year

Effective rate of 14.13% on $60,000 net profit

$2,119 / Quarter

Quarterly Est.

$2,119.43

4x per year

Social Security

$6,870.84

12.4% rate

Medicare Tax

$1,606.89

2.9% uncapped

AGI Deduction

-$4,238.87

50% SE write-off

IRS Schedule SE Tax Liability Breakdown

Net Business Profit (Schedule C)$60,000.00
Taxable SE Earnings (92.35% statutory factor)$55,410.00
Social Security Tax (12.4% on $55,410.00)+$6,870.84
Medicare Tax (2.9% on full $55,410.00)+$1,606.89
Total Annual Self-Employment Tax$8,477.73
50% Above-the-Line AGI Tax Deduction-$4,238.87
IRS Form 1040-ES Quarterly Deadlines
Q1 DeadlineApril 15
Q2 DeadlineJune 15
Q3 DeadlineSept 15
Q4 DeadlineJan 15 (Next Yr)
Self-Employment Tax & FICA Formulas
Taxable SE Base (92.35%)
SE Base = Net Profit × 0.9235
Combined FICA Tax (15.3%)
SE Tax = SS (12.4%) + Med (2.9%)
Quarterly Estimated Payment
Qtr Pay =
Annual SE Tax4 Quarters
Step-by-Step Calculation Breakdown
Example: $60,000 Net Self-Employment Business Profit
1. Taxable SE Income: $60,000 × 0.9235 = $55,410.00
2. Social Security Tax (12.4%): $55,410 × 0.124 = $6,870.84
3. Medicare Tax (2.9%): $55,410 × 0.029 = $1,606.89
4. Total Annual SE Tax: $6,870.84 + $1,606.89 = $8,477.73 (14.13% effective)
5. IRS Quarterly Payment: $8,477.73 ÷ 4 = $2,119.43 per quarter
6. Above-the-Line Deduction (50%): $8,477.73 ÷ 2 = $4,238.87 AGI write-off
Annual SE Tax Obligation:$8,477.73 / Year ($2,119.43 / Quarter)

Key Strategies for Minimizing Self-Employment Taxes

  • Track Every Legitimate Business Expense: Deductions for home office, business software, mileage, marketing, and professional equipment directly reduce Schedule C net profit before SE tax is computed.
  • Evaluate S-Corporation Election: At net profits exceeding $80,000–$100,000, operating as an S-Corp allows you to take a "reasonable salary" (subject to FICA) and receive remaining profits as distributions (exempt from 15.3% SE tax).
  • Fund Tax-Advantaged Retirement Plans: Contributions to a SEP-IRA or Solo 401(k) significantly reduce your income tax liability, providing thousands in annual cash savings.

Frequently Asked Questions

What is self-employment (SE) tax?
Self-employment tax consists of Social Security (12.4%) and Medicare (2.9%), totaling 15.3%. Unlike W-2 employees where the employer pays half (7.65%) and the employee pays half, freelancers and 1099 contractors pay both halves.
Why is net profit multiplied by 92.35%?
The IRS applies a 92.35% factor (100% minus the 7.65% employer-equivalent share) so that self-employed workers are not taxed on the portion of income that corresponds to the employer half of FICA taxes.
What is the Social Security wage base cap?
For the current tax year, the Social Security wage base is $168,600. Only earnings up to this limit are subject to the 12.4% Social Security tax. Earnings exceeding this cap are exempt from Social Security tax, though Medicare tax (2.9%) continues with no cap.
How does the 50% self-employment tax deduction work?
You can deduct exactly 50% of your total self-employment tax directly on IRS Form 1040 (Schedule 1) as an above-the-line deduction to lower your Adjusted Gross Income (AGI) and income tax liability.
When are IRS quarterly estimated taxes due?
Quarterly estimated tax deadlines for self-employed individuals are: Q1 (April 15), Q2 (June 15), Q3 (September 15), and Q4 (January 15 of the following tax year).

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