Self-Employment Tax Calculator

Maya left her salaried design job in January and netted $80,000 her first year on her own. She set aside money for income tax, felt responsible about it, and then her accountant added a line she'd never seen on a W-2: self-employment tax of roughly $11,304. That sits on top of regular income tax, not inside it. The number that blindsides almost every new freelancer is this one, and it arrives precisely because the job that used to absorb half of it is gone.

Here's what changed the moment she stopped getting a paycheck. When you're an employee, your employer quietly pays half of your Social Security and Medicare taxes and withholds the other half from each check. You see 7.65% come out and never think about the matching 7.65% your employer paid behind it. The day you became self-employed, both halves became yours. That combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare. Nobody hands you a memo about it. It simply shows up the first time you file.

The 12.4% Social Security portion only applies up to a ceiling. For 2026, that ceiling is the $184,500 wage base set by the Social Security Administration. Earn net profit above that, and the 12.4% stops; only the 2.9% Medicare portion keeps going, with no cap at all. High earners also hit an additional 0.9% Medicare surtax on net earnings above $200,000. So the effective rate isn't a flat 15.3% forever; it tapers above the wage base and then ticks back up for the highest earners.

Quick question: do you know what your number is? Most freelancers guess, set aside a vague "some for taxes," and then discover the gap in April when it's too late to do anything but pay. Maya's $11,304 wasn't a penalty, a mistake, or a sign she'd done something wrong. It was simply the bill that had been hidden inside her old paychecks the whole time, now arriving all at once because no employer was splitting it with her anymore.

The trap isn't the rate. It's the surprise. A salaried worker earning the same $80,000 paid the identical Social Security and Medicare taxes that year; they just never felt the employer's half because it never touched their bank account. Freelancers feel all of it in a single line, and that line is large enough to derail an entire quarter if you weren't planning for it. The fix is unglamorous but reliable: know the figure in advance, set the cash aside as income arrives, and treat the April bill as something you've already funded rather than something that ambushes you. Run your own number before tax season runs it for you.