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Tax Year 2026Updated July 13, 2026

Self-Employment Tax Calculator 2026, SE Tax, Deductions & Quarterly Estimates

Self-employed individuals pay both the employer and employee shares of Social Security and Medicare taxes, a combined rate of 15.30%. The IRS provides two adjustments to make this more equitable: first, your net earnings are multiplied by 92.35% before computing the tax (IRC §1402(a)(12)), and second, you can deduct 50% of the resulting SE tax as an above-the-line deduction on your Form 1040 (IRC §164(f)). Use this calculator to estimate your self-employment tax, the employer-half deduction, and quarterly estimated payments for 2026.

How Self-Employment Tax Works

Self-employment tax applies to net earnings from self-employment of $400 or more. It consists of two components:

  • Social Security (12.40%): Both halves of the 6.20%rate, applied to net SE earnings up to the wage base of $184,500. W-2 wages from other employment count toward this cap first.
  • Medicare (2.90%): Both halves of the 1.45% rate, applied to all net SE earnings with no cap.
  • Additional Medicare (0.90%): An extra surtax on combined earnings (W-2 wages + SE taxable base) above $200,000 for single filers. No employer match, employee-only.

The 92.35% Factor

Before computing SE tax, your net self-employment income is multiplied by 0.9235. This factor accounts for the fact that W-2 employees do not pay FICA on their employer's matching contribution. By reducing the taxable base, this effectively equalizes the treatment between employees and self-employed individuals.

The Employer-Half Deduction

After computing your SE tax, you can deduct 50% of it as an above-the-line deduction on Form 1040. This mirrors how W-2 employees never pay income tax on the employer's FICA share. The deduction reduces your adjusted gross income (AGI), which can lower your income tax, but it does not reduce the SE tax itself.

Quarterly Estimated Payments

If you expect to owe $1,000 or more in combined income and SE tax, you must make quarterly estimated payments. The 2026 deadlines are:

  • Q1: 2026-04-15 (covers income earned Jan 1 – Mar 31)
  • Q2: 2026-06-15 (covers income earned Apr 1 – May 31)
  • Q3: 2026-09-15 (covers income earned Jun 1 – Aug 31)
  • Q4: 2027-01-15 (covers income earned Sep 1 – Dec 31)

Worked Examples

Example 1: Freelancer, $100,000 Net SE Income, Single

Net SE income: $100,000.00
SE taxable base: $100,000.00 × 92.35% = $92,350.00
Social Security: $92,350.00 × 12.40% = $11,451.40
Medicare: $92,350.00 × 2.90% = $2,678.15
Additional Medicare: $0.00 (below $200,000 threshold)
Total SE tax: $14,129.55
Employer-half deduction: $7,064.78
Quarterly payment: $3,532.39

Example 2: Consultant, $200,000 Net SE Income, Single (Hits Additional Medicare)

Net SE income: $200,000.00
SE taxable base: $200,000.00 × 92.35% = $184,700.00
Social Security: $184,500 × 12.40% = $22,878.00 (capped at wage base)
Medicare: $184,700.00 × 2.90% = $5,356.30
Additional Medicare: $0.00 × 0.90% = $0.00
Total SE tax: $28,234.30
Employer-half deduction: $14,117.15
Quarterly payment: $7,058.58

Example 3: Side Business, $80,000 Net SE + $120,000 W-2 Wages (Reduced SS Base)

Net SE income: $80,000.00
W-2 wages: $120,000
SE taxable base: $80,000.00 × 92.35% = $73,880.00
Remaining SS wage base: $184,500 − $120,000 = $64,500
Social Security: $64,500.00 × 12.40% = $7,998.00
Medicare: $73,880.00 × 2.90% = $2,142.52
Additional Medicare: $0.00
Total SE tax: $10,140.52
Employer-half deduction: $5,070.26
Quarterly payment: $2,535.13

Frequently Asked Questions

What is the 92.35% factor for self-employment tax?
Under IRC §1402(a)(12), self-employed individuals multiply their net earnings by 92.35% before computing SE tax. This effectively gives you a deduction equivalent to the employer portion of FICA, employees don't pay FICA on the employer's matching contribution, and this factor provides a parallel benefit for self-employed individuals.
What is the self-employment tax rate?
The total SE tax rate is 15.30%, consisting of 12.40% for Social Security (both employer and employee halves of 6.20% each) and 2.90% for Medicare (both halves of 1.45% each). The Social Security portion applies only up to the wage base of $184,500.
What is the employer-half deduction?
Under IRC §164(f), self-employed individuals can deduct 50% of their total SE tax as an above-the-line deduction on Form 1040. This mirrors the fact that W-2 employees never pay income tax on their employer's share of FICA. This deduction reduces your AGI but does not reduce your SE tax itself.
When is Additional Medicare Tax triggered for self-employed individuals?
An additional 0.90% Medicare tax applies when your combined earnings (W-2 wages plus SE taxable base) exceed $200,000 for single filers. This additional tax applies only to the employee portion, there is no employer match. The threshold varies by filing status.
How do W-2 wages affect self-employment tax?
If you have both W-2 wages and self-employment income, your W-2 wages count toward the Social Security wage base of $184,500. Only the remaining base is available for your SE income. For example, if you earn $120,000 in W-2 wages, only $64,500 of your SE income is subject to the 12.40% Social Security tax.
How do I pay self-employment tax?
Self-employment tax is reported on Schedule SE and attached to your Form 1040. If you expect to owe $1,000 or more, you must also make quarterly estimated tax payments using Form 1040-ES. The four quarterly deadlines for 2026 are: 2026-04-15, 2026-06-15, 2026-09-15, and 2027-01-15.
What counts as net self-employment income?
Net self-employment income is your gross self-employment income minus business expenses, as calculated on Schedule C (for sole proprietors) or Schedule K-1 (for partnerships). This is the amount before the 92.35% factor is applied and before the employer-half deduction.

Self-Employment Tax Calculator