Historical Social Security and FICA Tax Rates for a Family of Four

Average and marginal employee Social Security and Medicare (FICA) tax rates for two-parent families of four at the same relative positions in the income distribution from 1955 to 2015.

Who does and doesn't pay federal income tax in the U.S.

What are the major federal payroll taxes, and how much money do they raise?

IRS Audits Poorest Families at Five Times the Rate for Everyone Else

The ABCs of FICA: Federal Insurance Contributions Act Explained - FasterCapital

The ROI On Paying Social Security FICA Taxes

Historical Federal Income Tax Rates for a Family of Four

The History of Your Social Security Payments

Research: Income Taxes on Social Security Benefits

Marginal Federal Tax Rates on Labor Income: 1962 to 2028

Outlook for SUI Tax Rates in 2023 and Beyond

Research: Income Taxes on Social Security Benefits

The social insurance system in the US: Policies to protect workers and families

What are the major federal payroll taxes, and how much money do they raise?

Is Social Security Worth Its Cost?

Payroll tax - Wikipedia