Is social security taxed before or after 401k?

You don't have to pay income taxes on your contributions to IRA Gold Companies, although you'll have to pay other payroll taxes, such as Social Security and Medicare taxes. You won't pay income tax on 401 (k) plan money until you withdraw it. Contributions to a 401k or IRA Gold Companies are subject to social security taxes and Medicare, but not to ordinary income tax. Therefore, the amount of your W-2 box will be lower than your real gross salary by the amount of your 401 thousand contributions and of any sect. The amounts in boxes 3 and 5 will constitute your gross salary, since 401,000 and other benefits are subject to SS and Medicare taxes.

Box 12 shows the elective deferment amounts.