Just realized a lot of people don't really understand what comes out of their paycheck. Those FICA taxes everyone talks about? They're actually two separate things working together, and here's what you need to know.

So FICA stands for Federal Insurance Contributions Act - basically the U.S. payroll tax system that funds Social Security and Medicare. Both programs support millions of retirees, disabled people, and their families. When you get paid, your employer automatically withholds these taxes from your check, and they throw in a matching amount too. It's a shared responsibility thing.

What does FICA consist of exactly? Two parts: Social Security taxes at 6.2% and Medicare taxes at 1.45%. That's 7.65% total coming from your paycheck, and your employer matches it. So between you and them, it's 15.3% of your earnings going to these programs. The Social Security part has a wage cap - in 2022 it was $147,000 - but Medicare taxes apply to everything you earn with no limit.

There's also this additional Medicare tax thing for higher earners. If you make over $200,000, you're paying an extra 0.9% on the amount above that threshold. Your employer starts withholding it once you cross that line.

If you're self-employed, it gets a bit different. You're paying both the employee and employer portions - so the full 15.3% - but you can deduct half of it on your tax return. The IRS calls it SECA taxes instead of FICA, but it's basically the same concept.

Quick math example: Say you made $135,000 in 2022. You'd pay $8,370 in Social Security taxes (135,000 x 6.2%) and $1,957.50 in Medicare (135,000 x 1.45%), totaling $10,327.50. Pretty straightforward once you know the rates.

The whole system funds current benefits for retirees and puts extra money into trust funds for future payouts. It's one of those things that just quietly happens every paycheck, but understanding what does FICA consist of and how it works actually matters when you're planning your finances.