401(k) Basics
A 401(k) is a retirement savings plan offered through an employer. You contribute part of your pay, often before taxes, and the money grows in investments you choose from a set list. Many employers also add money through a match, which can boost your savings.
A 401(k) is an employer-sponsored retirement account that lets you save part of your pay in a tax-advantaged way, often with an employer match on top of your own contributions.
Why it matters
A 401(k) makes retirement saving automatic. Contributions come straight out of your paycheck, so saving happens before you have a chance to spend the money, which makes it easier to stay consistent.
An employer match, when offered, adds money to your account based on what you contribute. This is extra money toward your retirement that you do not want to leave behind, which is why many people contribute at least enough to receive the full match.
Step by step
- 1
Understand how contributions work
You choose a percentage of your pay to contribute, and it is deducted automatically each pay period. With a traditional 401(k), contributions are usually made before income tax, which lowers your taxable income for the year.
- 2
Learn about the employer match
Many employers match part of what you contribute, up to a limit such as a percentage of your salary. Contributing at least enough to get the full match means you receive all of that extra money rather than giving some of it up.
- 3
Know the tax treatment
A traditional 401(k) grows without yearly taxes, and you pay income tax on withdrawals in retirement. Some plans also offer a Roth 401(k), where you contribute after-tax money and qualified withdrawals later are generally tax-free.
- 4
Choose your investments
Your 401(k) money is invested in options the plan offers, often including index funds and target-date funds. A simple, low-cost, diversified choice is a common starting point for long-term savers.
- 5
Mind the withdrawal rules
A 401(k) is meant for retirement, so taking money out early can trigger taxes and a penalty, with some exceptions. Understanding the rules helps you avoid surprises and keep the money growing for its purpose.
Practical example
Suppose you earn $50,000 and your employer matches your contributions up to a certain share of your pay. If you contribute enough to receive the full match, your employer adds money to your account on top of what you put in, so your total saved is more than your own contribution alone. The exact match depends on your plan. This is a simplified example, not a projection of results.
Common mistakes
- Contributing too little to receive the full employer match, when one is offered.
- Cashing out the account when changing jobs instead of keeping it invested for retirement.
- Leaving money in a default option without checking the investments or their fees.
- Withdrawing early without understanding the taxes and penalties that can apply.
How to apply it
Practical pointers for learning, not advice to buy or sell anything.
- Find out whether your employer offers a match, and contribute at least enough to receive the full amount.
- Review the investment options and their fees, and consider a simple, diversified choice.
- Increase your contribution over time, such as when you get a raise.
- When changing jobs, look into keeping the money invested rather than cashing it out.
Frequently asked questions
What is a 401(k)?
A 401(k) is a retirement savings plan offered through an employer. You contribute part of your pay, often before taxes, and the money is invested and grows over time. Many plans also include an employer match that adds money based on what you contribute.
What is an employer match?
An employer match is money your employer adds to your 401(k) based on your own contributions, usually up to a set percentage of your pay. Contributing at least enough to receive the full match means you collect all of that extra money toward retirement.
What is the difference between a traditional and Roth 401(k)?
A traditional 401(k) uses before-tax contributions and taxes withdrawals in retirement. A Roth 401(k), offered by some plans, uses after-tax contributions, and qualified withdrawals later are generally tax-free. The better fit depends on your tax situation now and later.
How much should I contribute to my 401(k)?
A common starting point is to contribute at least enough to receive the full employer match, if one is offered, and to increase contributions over time. Annual limits set by the IRS apply and can change, so it helps to check the current figure.
What happens to my 401(k) if I change jobs?
You generally have options, such as leaving it in the old plan, moving it to a plan at your new job, or rolling it into an IRA. Cashing it out early can trigger taxes and penalties, so many people keep the money invested for retirement instead.
Is this financial advice?
No. This page is general education only, not financial, investment, or tax advice. Plan rules and tax limits change over time, so consider speaking with a licensed professional or your plan administrator about your situation.
Related tools
Related concepts
Related guides
Related people
Read their profiles for context, not endorsement.
More financial literacy
Get smarter about money, one week at a time
Short, plain-English lessons on saving, budgeting, and investing. Always free.
Educational content only. This is a plain-English explanation for learning. It is not financial, investment, or tax advice, and not a recommendation to buy or sell anything. Examples are simplified and do not predict real results. Everyone's situation is different, so always do your own research and consider speaking with a licensed financial professional.