What is the one way fica taxes differ from the federal incone tax?

FICA taxes, which fund Social Security and Medicare, are specifically earmarked for social insurance programs, while federal income taxes are used for a broader range of government expenditures, including infrastructure, defense, and education. Additionally, FICA taxes are assessed at a flat rate on earned income, whereas federal income tax rates are progressive, meaning they increase with higher income levels. FICA taxes do not have a standard deduction or personal exemptions, unlike federal income taxes.