Self-employment tax: the 15.3% nobody warns you about

If you earn self-employment income, you owe a tax most new freelancers don't anticipate: the full 15.3% self-employment tax, which covers Social Security (12.4%) and Medicare (2.9%). As a W-2 employee, your employer paid half of this for you. As a self-employed person, you pay both halves.

The math

On top of your regular income tax bracket (10–37% federal, plus state), self-employed income faces an additional 15.3%. A freelancer in the 22% federal bracket effectively pays ~37% of each dollar before state taxes. This is why your 'take-home' from self-employment feels much lower than a W-2 job paying the same gross amount.

The small offsets

• You can deduct half of the self-employment tax on your income tax return (sort of returning the 'employer' portion to parity with W-2).
• Business expenses reduce your taxable profit dollar for dollar. Track them rigorously.
• At a certain profit level, an S-Corp election can reduce the portion of your income subject to self-employment tax by taking some of it as distributions.
• Self-employed retirement accounts (SEP, Solo 401k) offer huge contribution limits to reduce current taxable income.

Plan for it

The practical move: treat every invoice as if 30% disappears. Move that 30% to a separate tax savings account the day you get paid. Never touch it except to pay quarterly estimated taxes. If you do this, year-end is a non-event. If you don't, year-end is a catastrophe.