Whats a 401K?
A 401(k) is an employer-sponsored retirement savings account that lets you contribute pre-tax dollars directly from your paycheck, grow investments tax-deferred, and often receive matching contributions from your employer. Named after Section 401(k) of the Internal Revenue Code, it's the most common workplace retirement plan in the United States, covering roughly 60 million active participants and holding over $7 trillion in assets.
How does a 401(k) account actually work?
A 401(k) works through automatic payroll deductions that go into an individual account in your name. You choose a contribution percentage or dollar amount, your employer deducts that amount before calculating income tax, and the money gets invested in options you select from the plan menu—typically mutual funds, target-date funds, or index funds.
What are the 2024 contribution limits for 401(k) plans?
For 2024, you can contribute up to $23,000 to your 401(k) if you're under age 50. If you're 50 or older, you can add an extra $7,500 "catch-up contribution," bringing your total to $30,500.
What's the difference between a traditional 401(k) and a Roth 401(k)?
A traditional 401(k) uses pre-tax contributions, lowering your taxable income today but requiring you to pay ordinary income tax on all withdrawals in retirement. A Roth 401(k) uses after-tax contributions—no upfront tax break—but all qualified withdrawals after age 59½ are completely tax-free, including decades of growth.
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When can you withdraw money from a 401(k) without penalties?
You can make penalty-free withdrawals from a 401(k) once you reach age 59½, though you'll still owe ordinary income tax on traditional 401(k) withdrawals. If you withdraw before 59½, you typically face a 10% early withdrawal penalty on top of income taxes.
What happens to your 401(k) when you change jobs?
When you leave an employer, you have four main options for your 401(k). You can leave the money where it is if your balance exceeds $7,000 (some plans allow lower balances to stay).
How is a 401(k) different from an IRA?
A 401(k) is employer-sponsored with higher contribution limits ($23,000 in 2024), potential employer matching, and automatic payroll deductions, but limited investment options chosen by your employer. An IRA is an individual account you open yourself with contribution limits of just $7,000 in 2024 ($8,000 if 50+), no employer matching, and typically unlimited investment choices across stocks, bonds, ETFs, and mutual funds at any brokerage.
FAQ
Can you lose money in a 401(k)?
Yes, because your contributions are invested in stocks, bonds, or funds that fluctuate in value. Your account balance can decline during market downturns, especially if heavily invested in stocks.
What does vesting mean in a 401(k)?
Vesting determines how much of your employer's contributions you actually own. Your own contributions are always 100% vested immediately.
Do all employers offer 401(k) matching?
No—roughly 80% of plans offer some form of match, but it's not legally required. Common formulas include 50% of your contributions up to 6% of salary, or 100% of contributions up to 3% of salary.
What happens to a 401(k) if the company goes bankrupt?
Your 401(k) assets are held in a trust separate from your employer's business assets, so they're protected if the company goes bankrupt. You won't lose your account balance.
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How the 401k calculation works
A 401k projection starts with the current balance and adds planned employee and employer contributions over time. It then applies an assumed rate of return, usually with periodic compounding. Actual results depend on investment performance, fees, contribution timing, vesting, and withdrawals. Review the current 401k limit and your plan documents because IRS limits and employer contribution formulas can change.
Traditional 401k contributions generally receive different current tax treatment from roth 401k contributions, while qualified withdrawal rules also differ. A 401k plan may offer limited investment choices and an employer match, whereas an IRA generally offers a separate contribution limit and broader provider selection. A solo 401k is designed for eligible self-employed individuals. A 403b plan and the federal TSP have their own rules and should not be treated as identical accounts.
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