Answered from cited sources · retrieved September 20, 2026
what is a 401k
A 401(k) is a tax-advantaged, employer-sponsored retirement savings plan that allows employees to invest a portion of their paycheck for retirement.
A 401(k) is a tax-advantaged, employer-sponsored retirement savings plan that allows employees to contribute a portion of their paycheck to an investment account. Employers may also contribute to these accounts, often by matching a percentage of the employee's contributions. The money is typically invested in options like mutual funds or target-date funds, and it is generally intended to be held until retirement age, which is 59½. There are two primary types: traditional, which uses pre-tax dollars, and Roth, which uses after-tax dollars. Each has different tax implications for when you contribute and when you withdraw the funds.
- Employee and Employer Contributions. Employees contribute a percentage of their salary directly from their paycheck, and employers may choose to match a portion of these contributions.
- Traditional vs. Roth Options. Traditional 401(k)s use pre-tax dollars, reducing current taxable income, while Roth 401(k)s use after-tax dollars, allowing for tax-free withdrawals in retirement.
- Investment Choices. Employees select their investments from a menu provided by their employer, typically including mutual funds, index funds, and target-date funds.
- Limits and Withdrawals. The IRS sets annual contribution limits, and there are generally penalties for withdrawing funds before reaching age 59½.
Sources
- 401(k) plans | Internal Revenue Serviceirs.gov · published January 30, 2026
- 401(k) Plans: What Are They, How They Workinvestopedia.com · published November 18, 2003
- What's a 401(k)?fidelity.com · published May 5, 2026
- 401(k)en.wikipedia.org
- What Is A 401(k)? A Beginner’s Guide – Forbes Advisorforbes.com · published November 3, 2023
- What is a 401(k)? Understanding retirement plansblackrock.com
- 401(k) Resource guide plan: Participants 401(k) plan overview | Internal Revenue Serviceirs.gov
- What Is a 401(k) Plan and How Does It Work?schwab.com
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