What is a 401(k) plan, and how does it work?

Gain insight into the workings of a 401(k) plan and how it can help you save for retirement. Learn about contributions, employer matches, and investment choices.


A 401(k) plan is a tax-advantaged retirement savings plan offered by employers to their employees in the United States. It is named after the section of the Internal Revenue Code that governs these plans. A 401(k) plan allows employees to save and invest a portion of their pre-tax income for retirement, helping them build a nest egg over time.

Here's how a 401(k) plan works:

  1. Employee Contributions: Employees who participate in a 401(k) plan can choose to have a percentage of their salary or a fixed dollar amount deducted from their paychecks before taxes are withheld. These contributions are often called "elective deferrals." The money is then invested in a variety of investment options offered within the plan.

  2. Employer Contributions: Many employers offer a matching contribution as an incentive for employees to save for retirement. The employer matches a portion of the employee's contributions, typically up to a certain percentage of the employee's salary. For example, an employer might match 50% of an employee's contributions up to 6% of their salary. This is essentially "free money" that boosts the employee's retirement savings.

  3. Tax Advantages: One of the primary advantages of a 401(k) plan is its tax benefits. Contributions made by employees are typically tax-deductible, meaning they reduce the employee's taxable income in the year the contribution is made. This can result in lower income taxes. Additionally, the money in the 401(k) account grows tax-deferred, which means that investment gains are not subject to taxes until withdrawals are made in retirement.

  4. Investment Options: 401(k) plans typically offer a range of investment options, including mutual funds, exchange-traded funds (ETFs), stocks, bonds, and sometimes more specialized investments. Employees can choose how to allocate their contributions among these investment options based on their risk tolerance and investment goals.

  5. Vesting: Employer contributions to a 401(k) plan may be subject to a vesting schedule. Vesting determines when employees have full ownership of employer-contributed funds. Some plans offer immediate vesting, while others have graded vesting schedules that grant ownership gradually over a specified period.

  6. Withdrawal Rules: The primary purpose of a 401(k) is to save for retirement, so there are rules and penalties for early withdrawals before a certain age, usually 59½. Withdrawals made before this age may be subject to income taxes and a 10% early withdrawal penalty, with some exceptions, such as financial hardship or certain qualified distributions.

  7. Required Minimum Distributions (RMDs): After reaching age 72 (or 70½ if you turned 70½ before January 1, 2020), individuals with 401(k) accounts must begin taking required minimum distributions (RMDs) each year. These withdrawals are subject to income taxes and are designed to ensure that individuals gradually deplete their retirement savings over their lifetimes.

  8. Portability: If an employee leaves their job or changes employers, they can typically take their 401(k) savings with them. They can roll over the funds into an Individual Retirement Account (IRA) or into the 401(k) plan of their new employer, if permitted.

  9. Contribution Limits: The IRS sets annual contribution limits for 401(k) plans. These limits apply to both employee and employer contributions.  the annual employee contribution limit for most individuals was $19,500, with an additional catch-up contribution of $6,500 for those aged 50 and older.

  10. Plan Administration: 401(k) plans are administered by the employer or a third-party administrator. Plan administrators are responsible for record-keeping, compliance with tax laws and regulations, and providing investment options and information to participants.

401(k) plans are valuable tools for retirement savings, offering tax advantages, potential employer contributions, and the ability to invest in a diversified portfolio of assets. Employees should take advantage of these benefits by participating in their employer's 401(k) plan and contributing regularly to build a secure retirement future.

Understanding the Mechanics of a 401(k) Retirement Plan.

A 401(k) plan is a retirement savings plan offered by many employers in the United States. It is a defined-contribution plan, which means that the amount of money you receive in retirement is based on your contributions and investment returns.

Here is a basic overview of how a 401(k) plan works:

  • Employee contributions: Employees can contribute a portion of their paycheck to their 401(k) account. The amount of money you can contribute is limited each year by the IRS. In 2023, the employee contribution limit is $20,500 ($27,000 for those age 50 or older).
  • Employer matching contributions: Many employers offer matching contributions to their employees' 401(k) accounts. This means that the employer will contribute a certain amount of money to your 401(k) account for every dollar you contribute, up to a certain limit. For example, an employer may offer a 50% match on up to the first 6% of your salary. This is essentially free money for your retirement.
  • Investment options: 401(k) plans offer a variety of investment options, such as mutual funds, stocks, and bonds. Employees can choose the investment options that best meet their individual needs and risk tolerance.
  • Tax advantages: 401(k) contributions are made with pre-tax dollars, which means that they reduce your taxable income. This can save you money on your taxes today. Investment earnings in a 401(k) account also grow tax-deferred, meaning that you don't have to pay taxes on them until you withdraw the money in retirement.
  • Withdrawals: You can begin withdrawing money from your 401(k) account without penalty at age 59½. However, you will have to pay taxes on the withdrawals. If you withdraw money from your 401(k) account before age 59½, you will have to pay a 10% early withdrawal penalty, in addition to income taxes.

401(k) plans are a great way to save for retirement. They offer tax advantages and a variety of investment options. If you are eligible to participate in a 401(k) plan, you should definitely take advantage of it.

Here are some tips for saving for retirement in a 401(k) plan:

  • Contribute as much as you can: The more money you contribute to your 401(k) account, the more money you will have in retirement. If you can, try to contribute at least enough to take advantage of your employer's matching contributions.
  • Increase your contributions as your income increases: As your income increases, try to increase your 401(k) contributions as well. This will help you to save more money for retirement.
  • Rebalance your portfolio regularly: As you get closer to retirement, you may want to rebalance your portfolio to reduce risk. This means investing in a higher percentage of bonds and other fixed-income investments.
  • Consider working with a financial advisor: If you need help developing a financial plan or choosing investments, consider working with a financial advisor. They can help you to make the most of your 401(k) plan.