Self-Employment Tax Calculator

Calculate self-employment taxes (Social Security and Medicare) and quarterly estimated tax payments for freelancers, contractors, and business owners.

What is Self-Employment Tax?

Self-employment (SE) tax is the Social Security and Medicare tax that self-employed people, freelancers, and business owners must pay. Unlike employees (where tax is split with the employer), self-employed people pay both the employee and employer portions, totaling 15.3%.

This calculator helps you estimate your SE tax and quarterly estimated tax payments, which are required if you expect to owe $1,000 or more.

Calculate Self-Employment Tax

Total SE Tax

$7,064.78

Annual self-employment tax

Quarterly Payment

$1,766.19

Due: Apr 15, Jun 15, Sep 15, Jan 15

Monthly Payment

$588.73

If paying monthly

Effective SE Tax Rate

14.13%

Percentage of net income

SE Tax Breakdown

Net Self-Employment Income$50,000.00
SE Income (92.35% of net)$46,175.00
Social Security Tax (12.4%)$5,725.70
Medicare Tax (2.9%)$1,339.08
Total SE Tax$7,064.78
SE Tax Deduction (50% of SE tax)-$3,532.39

How Self-Employment Tax is Calculated

Step-by-Step Formula

1. SE Income = Net Income × 92.35%

2. SS Tax = SE Income × 12.4% (capped at $168,600 wage base)

3. Medicare Tax = SE Income × 2.9% (no cap)

4. Additional Medicare = Max(0, SE Income - $200k) × 0.9%

5. Total SE Tax = SS Tax + Medicare Tax + Additional Medicare

Example

Self-employed business owner with $60,000 net income

Net Income: $60,000

SE Income: $60,000 × 0.9235 = $55,410

Social Security Tax: $55,410 × 0.124 = $6,871

Medicare Tax: $55,410 × 0.029 = $1,607

Total SE Tax: $8,478

Quarterly Payment: $8,478 ÷ 4 = $2,119.50

SE Deduction: $8,478 ÷ 2 = $4,239 (reduces taxable income)

Understanding SE Tax Components

📊 Social Security Tax (12.4%)

Capped at $168,600 of SE income (for 2024). Once you reach this cap, no additional Social Security tax is owed. This tax funds Social Security retirement, disability, and survivor benefits.

Example: $60,000 SE income × 12.4% = $7,440. If you had $200,000 SE income, only the first $168,600 is taxed: $168,600 × 12.4% = $20,906 (not the full $24,800).

🏥 Medicare Tax (2.9%)

No wage cap—ALL SE income is subject to the 2.9% Medicare tax. This funds Medicare health insurance for seniors and disabled individuals.

Example: $60,000 SE income × 2.9% = $1,740. Whether you earn $50,000 or $500,000, the full amount is taxed at 2.9%.

💰 Additional Medicare Tax (0.9%)

Applies to SE income over $200,000. This is part of the Affordable Care Act and goes toward expanding Medicare coverage and reducing the deficit.

Example: If you have $250,000 SE income: ($250,000 - $200,000) × 0.9% = $450 additional tax.

📉 The 92.35% Factor

Self-employed people can deduct 50% of their SE tax from their income. This is why SE income is calculated as 92.35% of net income, not 100%. This gives a slight tax break and matches the employee/employer split for W-2 workers.

Quarterly Estimated Tax Payments

Payment Deadlines

Q1 (Jan–Mar)

Due: April 15

Q2 (Apr–Jun)

Due: June 15

Q3 (Jul–Sep)

Due: September 15

Q4 (Oct–Dec)

Due: January 15 (next year)

Do I need to pay quarterly? You must pay if you expect to owe $1,000 or more in estimated taxes. If you miss a payment, you may face penalties and interest, so setting up a payment schedule is important.

How to pay: Use IRS Direct Pay, Electronic Federal Tax Payment System (EFTPS), credit/debit card, or mail Form 1040-ES with a check. Keep payment records for your tax file.

Self-Employment Tax by Income Level

Net IncomeTotal SE TaxQuarterly PaymentEffective Rate
$25,000$3,532$88314.1%
$40,000$5,651$1,41314.1%
$60,000$8,478$2,12014.1%
$100,000$14,130$3,53314.1%
$200,000$28,260$7,06514.1%

References & Resources

  • IRS Schedule SE: Self-Employment Tax
  • IRS Publication 15-B: Employer's Tax Guide to Fringe Benefits
  • IRS Form 1040-ES: Estimated Tax Payments
  • Social Security Administration: Self-Employment Tax Information
  • SCORE: Free Small Business Mentoring

Breaking Down Self-Employment Tax

Self-employment tax consists of two components: Social Security tax at 12.4% and Medicare tax at 2.9%, totaling 15.3% of your net self-employment income. Unlike W-2 employees who split this cost with their employer, self-employed individuals pay both halves. The 92.35% factor adjusts your net income to account for the deductible portion of SE tax.

The SE Tax Deduction

You can deduct 50% of your self-employment tax from your adjusted gross income, reducing your federal income tax liability. This deduction is taken above-the-line, meaning you benefit even if you don't itemize. For example, if you owe $8,000 in SE tax, you can deduct $4,000 from your taxable income.

W-2 and 1099 Income Interaction

If you have both W-2 employment and 1099 self-employment income, the Social Security tax you already paid through your employer counts toward the annual wage base limit. Any 1099 income below the cap is still subject to the full 15.3% SE tax. Use this calculator to plan quarterly estimated payments and avoid underpayment penalties.

Frequently Asked Questions

What is self-employment (SE) tax?
Self-employment tax is the Social Security and Medicare tax that self-employed people pay. It covers both the employee and employer portions (15.3% total: 12.4% Social Security + 2.9% Medicare). Employees have these split between them and their employer; self-employed people pay both halves.
Why is the SE income multiplied by 92.35%?
The 92.35% factor represents the deduction of the employer-equivalent portion of SE tax. Self-employed people can deduct this amount from their income before calculating SE tax, which reduces their tax burden slightly compared to if SE tax were applied to 100% of income.
What is the Social Security wage base limit?
For 2024, the Social Security wage base is $168,600. Only income up to this limit is subject to the 12.4% Social Security tax. Any income above $168,600 is NOT subject to Social Security tax (but IS subject to Medicare tax and income tax). This limit increases annually.
Is there a Medicare tax cap?
No. Medicare tax (2.9%) applies to ALL self-employment income, with no wage base limit. Additionally, an extra 0.9% Medicare tax applies to SE income over $200,000. This is called the Additional Medicare Tax and has no cap.
When must I pay quarterly estimated taxes?
You must pay estimated taxes quarterly if you expect to owe $1,000 or more. Quarterly due dates are April 15, June 15, September 15, and January 15. If you miss a deadline, you may face penalties and interest. Divide your annual SE tax by 4 to estimate each quarterly payment.
Can I deduct SE tax payments?
Yes! You can deduct 50% of your SE tax as a business expense, which reduces your federal taxable income. This deduction is taken "above-the-line," meaning you get the benefit even if you don't itemize. This is included in this calculator as the "SE Deduction."

Related Tools