Social Security and Medicare taxes Federal Social Security and Medicare taxes Federal income taxes Federal Taxes requirements mandated by the government pay into these funds Social Security and Medicare taxes employment taxes responsible for withholding taxes IRS list of employment taxes IRS Understanding Employment Taxes Employers Understanding employment taxes withholding income tax, Social Security and Medicare taxes tax withholding rules Employers employment taxes According to the IRS employment taxes Medicare and Social Security. Understanding Employment Taxes Employers overview of employment taxes Understanding Employment Taxes Federal and state payroll and withholding taxes Employers Federal Social Security and Medicare taxes Employment Tax Guide Employers Understanding Employment Taxes Social Security and Medicare taxes Social Security and Medicare taxes Social Security and Medicare Federal income taxes Internal Revenue Service: Understanding Employment Taxes Employment Taxes for Businesses