Want to Be Self-Employed? These 2 "Hidden Taxes" Will Cost You Thousands

One of the most powerfully rewarding decisions I ever made was to walk away from my job and to become a contract writer for The Motley Fool. It's been more than five years since making that change, and I could burn a few thousand words describing how it's improved the quality of my life and given me more professional fulfillment.

Instead, let me caution readers considering making the move to avoid some common pitfalls, including not considering the full implications of going to work for yourself. There are things you'll be responsible for paying for that your employer covers today, and it could have a significant impact on how much money you actually keep -- not to mention how much tax you owe -- when you're self employed.

That's why, even though my experience has been wonderful, and I can't imagine ever going back to employment-based work again, it's not for everyone.

A young man in an office conference room smiles as he carries his office belongings in a box, preparing to walk out.
A young man in an office conference room smiles as he carries his office belongings in a box, preparing to walk out.

Going to work for yourself can be rewarding if you avoid the hidden pitfalls. Image source: Getty Images.

Case in point: There are two simple items your employer pays for today that, between them, could cut the amount of your earnings you take home by 10% or more when you're self-employed. Let's take a closer look at them, as well as some strategies to lessen the impact.

The other half of the Social Security tax

If you've ever collected a paycheck, you've seen the Social Security Taxes line (or FICA) on your pay stub or W2. Employees pay 6.2% of their earnings in Social Security tax each year, capped at a certain amount of income. In 2018, it was 6.2% on the first 128,400 earned, but that amount increased to $132,900 in 2019.

Of course, you would continue to be responsible for Social Security tax if you're self-employed. But what many people don't realize is the payroll withholding you see on your pay stub is only half of the total that goes to Social Security. Your employer pays another tax, equal to 6.2% of your earnings, in Social Security tax.

Woman with stunned expression looks at computer screen.
Woman with stunned expression looks at computer screen.

Don't get caught off guard by the self-employment tax. Image source: Getty Images.

When you go out on your own, your Social Security tax burden doubles from 6.2% to 12.4% of the first $132,900 you earn. When you add in the 1.45% Medicare tax -- also paid by the employee and employer -- your combined FICA tax rate goes from 7.65% to 15.3%.

Called the self-employment tax, this higher rate works out to an additional $765 in taxes you'll pay on every $10,000 you earn, up to the taxable earnings limit.

Something else your employer pays

While it's not an actual tax, there's another substantial amount of money that most employers give workers each year, that you'll need to offset: 401(k) employer contributions.