Do I have to pay self-employment tax if I also have a W-2 job?

Yes. If your net self-employment income is $400 or more, you owe SE tax regardless of W-2 wages. However, your W-2 wages count toward the Social Security wage base ($176,100 in 2025), so you may pay less SE tax on the Social Security portion if your W-2 income is high.

Can I deduct half of my self-employment tax?

Yes. The IRS allows you to deduct 50% of your self-employment tax from your gross income when calculating federal income tax. This deduction is taken on Schedule 1 of Form 1040.

What counts as self-employment income?

Self-employment income includes freelance earnings, 1099-NEC payments, gig work (Uber, DoorDash, etc.), consulting fees, business revenue, and any other income from work where taxes were not withheld. It also includes earnings from side hustles and independent contracting.

How is self-employment tax calculated?

Self-employment tax is calculated on 92.35% of your net SE income (this accounts for the deductible employer half). The 15.3% rate applies to that amount up to the Social Security wage base, then only 2.9% Medicare applies above that threshold.

Self-Employment Tax Calculator | W-2 + 1099 Income

W-2 & Filing Info

Filing Status

W-2 / Salary Income (gross, before taxes)

Standard Deduction (auto-filled for your filing status)

Self-Employment Income

Income Sources (1099, freelance, gig, etc.)

I have business expenses to deduct

Business Expenses (Schedule C deductions)

Your Tax Estimate: 2026

Enter your income above to see your estimate.

SE Tax
$0
Social Security + Medicare

SE Deduction

50% of SE tax (saves you money)

Est. Federal Income Tax

On taxable income

Total Est. Tax Owed

SE tax + federal income tax

Effective Tax Rate

% of total gross income

Marginal Rate

Your top tax bracket

Effective tax rate 0%

Self-Employment Tax Breakdown

SE Income (net)$0

SE Tax Base (92.35%)$0

Social Security (12.4%)$0

Medicare (2.9%)$0

Additional Medicare (0.9%)$0

Total SE Tax$0

Federal Income Tax Breakdown

W-2 + SE Income$0

– SE Deduction($0)

– Standard Deduction($0)

= Taxable Income$0

Federal Income Tax$0

Estimated Quarterly Tax Payments (SE + income tax)

Jan 1 – Mar 31

Q1: Due Apr 15

Apr 1 – May 31

Q2: Due Jun 16

Jun 1 – Aug 31

Q3: Due Sep 15

Sep 1 – Dec 31

Q4: Due Jan 15

How the Self-Employment Tax Calculator Works

Self-employed workers pay both the employee and employer share of Social Security and Medicare taxes. This calculator walks through the IRS methodology step by step.

Net SE IncomeEnter your gross self-employment income minus any business expenses (Schedule C).

SE Tax BaseThe IRS applies 92.35% to your net SE income (this accounts for the deductible employer half).

SE Tax15.3% applies to the SE base up to the Social Security wage base; 2.9% Medicare applies above that.

SE DeductionYou deduct 50% of SE tax from gross income before calculating federal income tax, a key tax break.

2025 SE Tax Reference

SE Income Level	Social Security	Medicare	Total SE Tax Rate
Up to SS wage base ($176,100)	12.4%	2.9%	15.3%
Above $176,100	0%	2.9%	2.9%
Above $200K (single) / $250K (MFJ)	0%	3.8% (+ 0.9% surtax)	varies

Frequently Asked Questions

The SE tax rate for 2025 is 15.3% on the first $176,100 of net SE income (12.4% Social Security + 2.9% Medicare). Income above $176,100 is subject only to the 2.9% Medicare portion. An additional 0.9% Medicare surtax applies to income above $200,000 for single filers or $250,000 for married couples filing jointly.

Yes: if your net self-employment income is $400 or more, you must pay SE tax. However, your W-2 wages already count toward the Social Security wage base ($176,100 in 2025). If your W-2 wages are high, the SS portion of your SE tax may be reduced or eliminated, but you'll still owe the Medicare portion on all SE income.

Yes. The IRS lets you deduct 50% of your self-employment tax from your gross income on Schedule 1 of Form 1040. This "employer" deduction reduces your federal income tax but does not reduce the SE tax itself. This calculator automatically factors in this deduction.

SE income includes: freelance work, consulting fees, 1099-NEC earnings, gig economy income (Uber, Lyft, DoorDash, Airbnb, etc.), sales from your own business, and any income from work where no federal taxes were withheld. It does not include W-2 wages, investment income, rental income (generally), or passive income.

If you expect to owe $1,000 or more in federal taxes after subtracting withholding, you are generally required to make quarterly estimated payments. The 2025 due dates are April 15, June 15, September 15, and January 15, 2026. The calculator above shows a quarterly estimate divided equally across the four periods as a starting guide.

Common deductible business expenses include: home office, vehicle mileage (67 cents/mile in 2024), equipment and software, health insurance premiums (100% deductible for the self-employed), professional services, subscriptions, advertising, and business travel. Keep receipts and records for everything. Enter your total estimated deductions in the "Business Expenses" field above.

Self-Employment Tax Calculator

How the Self-Employment Tax Calculator Works

2025 SE Tax Reference

Frequently Asked Questions

Tax Calculators by Platform & Profession

Gig Platforms

Freelance Professions

Tax Scenarios

Tax Guides & Resources

Why Quarterly Estimated Taxes Matter: How to Calculate Yours

The Freelance Finance Mindset: Why Freelancers Need to Think Differently About Money

Quarterly Estimated Taxes: How They Work (and Why You'll Get Penalized If You Skip)

How to Calculate Your Quarterly Estimated Tax Payment

Disclaimer