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The Daily Insight

Are 401k contributions subject to Social Security?

Author

Emma Jordan

Published Mar 21, 2026

Because 401(k) contributions are subject to Social Security tax, they are included in Social Security wages on Form W-2. The form shows your annual wages earned and taxes withheld for the year; you use it to file your tax return with the IRS and applicable state and local agencies.

Is a 401k a tax exempt benefit?

With a tax-deferred account, tax savings are realized when you make contributions, but with a tax-exempt account, withdrawals are tax-free in retirement. Common tax-deferred retirement accounts are traditional IRAs and 401(k)s. Popular tax-exempt accounts are Roth IRAs and Roth 401(k)s.

Are 401a plans subject to RMD?

Like other retirement plans, a 401(a) plan is also subject to required minimum distributions (RMDs) beginning at age 70 ½. You are not required to make withdrawals from the plan before reaching this age, even if you have reached the age of your actual retirement.

Is a 401k a tax-exempt benefit?

What taxes are exempt from 401k?

What Taxes Are 401(k)s Exempt From? Pre-tax 401(k) contributions are exempt from federal income taxes, state income taxes, and local income taxes.

What taxes are exempt from 401k contributions?

What are 401k contributions exempt from for employee pay?

What are 401k contributions exempt from for an employee’s pay. Financial Professional: Bill, Financial Advisor replied 9 years ago. Salary deferral contributions to 401(k) plans are exempt from federal income taxes and exempt from state income taxes in some states. They are not exempt from from social security or medicare taxes.

Do you have to pay Social Security on a 401 ( a ) plan?

For the 401 (a) employer contributions to not be subject to withholdings for Social Security and Medicare taxes, the employer contributions need to be extra compensation, not compensation that is deducted from the salary. So, it needs to be considered a salary “supplement” to apply.

Is the employer contribution to Social Security taxable?

Employer contributions are usually exempt from all taxes, including Social Security and Medicare. Employee Contributions Contributions made to a 401(k) , individual retirement account (IRA) , or savings incentive match plan for employees (SIMPLE) IRA, are exempt from federal income tax.

Can a employer contribute to a 401 ( a ) plan?

As the employee, you can make dollar-based or percentage-based contributions. With a 401 (a), your employer makes contributions whether you choose to also contribute from your salary or not.