FICA components
Strictly speaking, FICA taxes consist of two parts since they're used to fund two different programs. The 7.65% tax includes a 6.2% Social Security tax and a 1.45% Medicare tax. If you work for an employer, you pay the 7.65% tax to cover the costs of both programs; your employer pays another 7.65%. If you're self-employed, you're on the hook for a 15.3% tax rate, although you can deduct half of the amount on your annual federal tax return.
There's more good news from a taxpayer perspective: The 6.2% Social Security tax only applies to the first $168,600 in earnings in 2024, though this amount is adjusted annually. So, a person who earns $168,600 and another person who earns $1 million pay the same amount in Social Security taxes. Meanwhile, wealthy earners -- only employees, not employers -- are stuck with an additional 0.9% surtax if they're single and earn more than $200,000 or married/joint filers and earn more than $250,000.