A 401(k) is an employer-sponsored retirement savings plan in the United States that allows employees to contribute a portion of their salary to a tax-advantaged investment account. Contributions to a 401(k) are typically made on a pre-tax basis, meaning they reduce the employee's taxable income for the year. The investments grow tax-deferred until withdrawals are made in retirement, at which point they are taxed as ordinary income. Many employers offer matching contributions, where they contribute an additional amount to the employee's 401(k) based on the employee's contributions, up to a certain limit. There are also Roth 401(k) options, where contributions are made with after-tax dollars, allowing for tax-free withdrawals in retirement. 401(k) plans have annual contribution limits set by the IRS and are subject to required minimum distributions (RMDs) starting at age 73.

401k Basics


401k Glossary

10% Penalty(Noun)
/ten per-sent pen-uhl-tee/
Definition: A tax penalty imposed by the IRS on early withdrawals from a 401(k) or other retirement accounts before the age of 59½, in addition to regular income taxes, unless an exception applies.
Etymology: "Penalty" from Latin "poena," meaning "punishment." The 10% penalty deters premature withdrawals from retirement accounts.
Similar: Early withdrawal penalty, Tax penalty
Opposite: Penalty-free withdrawal
Example: "Withdrawing from your 401(k) before age 59½ usually incurs a 10% penalty on top of regular income taxes."
401(k) Calculator(Noun)
/fawr-oh-wuhn-kay kal-kyuh-ley-ter/
Definition: An online tool that helps individuals estimate their 401(k) balance at retirement based on factors like contribution rate, employer match, investment returns, and time until retirement.
Etymology: "Calculator" from Latin "calculare," meaning "to count." A 401(k) calculator helps plan retirement savings growth.
Similar: Retirement savings calculator, 401(k) estimator
Example: "Using a 401(k) calculator can help you determine how much you need to contribute to reach your retirement goals."
401(k) Match Formula(Noun)
/fawr-oh-wuhn-kay mach fawr-myuh-luh/
Definition: The specific criteria set by an employer to determine how much they will contribute to an employee’s 401(k) plan, typically expressed as a percentage of the employee's contributions up to a certain limit.
Etymology: "Match" from Old English "mǣt," meaning "to agree with," and "formula" from Latin "formula," meaning "form or rule." The 401(k) match formula dictates employer contributions to the plan.
Similar: Matching contribution formula, Employer match criteria
Opposite: Non-matching plan
Example: "Understanding your company's 401(k) match formula can help you maximize your retirement savings."
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Frequently Asked Questions

  • What is a 401(k)?

    A 401(k) is an employer-sponsored retirement savings plan in the U.S. that allows employees to save and invest a portion of their salary in a tax-advantaged account. Contributions can be made on a pre-tax basis, reducing taxable income, or as after-tax contributions in a Roth 401(k), allowing for tax-free withdrawals in retirement.

  • How does a 401(k) reduce my taxable income?

    When you contribute to a traditional 401(k), the money is taken out of your paycheck before taxes, which reduces your taxable income for that year. This means you pay less in income taxes now, though you’ll pay taxes on withdrawals in retirement.

  • What is an employer match in a 401(k)?

    An employer match is when your employer contributes additional money to your 401(k) based on your own contributions, up to a certain limit. For example, an employer might match 50% of your contributions up to 6% of your salary. This is essentially free money added to your retirement savings.

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