⚠ Educational only. TaxPlain does not provide tax, legal, or financial advice. Always consult a qualified financial advisor or tax professional about your specific situation.
What this account is
A 401(k) is an employer-sponsored retirement savings account that lets you invest money for retirement while getting tax advantages from the IRS.
Think of it as a long-term investing bucket attached to your job. Money goes in from your paycheck automatically, grows over time through investments like mutual funds or index funds, and is generally meant to stay untouched until retirement age.
The biggest reason people use a 401(k): taxes. Traditional 401(k) contributions reduce your taxable income today, while Roth 401(k) contributions can allow tax-free withdrawals later in retirement.
How it works
✓ Traditional 401(k)
Contributions are made before taxes. You pay less income tax today, but withdrawals in retirement are taxed as ordinary income.
✓ Roth 401(k)
Contributions are made after taxes. You don't get a deduction now, but qualified withdrawals in retirement are generally tax-free.
📅 2024 contribution limits
Most employees can contribute up to $23,000 per year to a 401(k). If you're age 50 or older, you can contribute an additional $7,500 catch-up contribution for a total of $30,500.
Why employer matching matters
The closest thing to free money
Many employers match part of your contributions. Example: "100% match up to 4%" means if you contribute 4% of your salary, your employer contributes another 4%.
That's an immediate 100% return on your money before any investment growth. Failing to contribute enough to get the full match is one of the most expensive financial mistakes employees make.
Employee contribution — Money deducted from your paycheck
Employer match — Extra money your employer adds
Vesting schedule — Rules determining when employer contributions fully belong to you
Investment options — Funds where your money is invested
Automatic payroll deductions — Contributions happen automatically each pay period
Common investment choices
Your 401(k) usually offers a menu of investments. Most people choose combinations of:
Target-date funds — Automatically become more conservative as retirement approaches
Index funds — Track major markets like the S&P 500 with low fees
Bond funds — Generally lower risk and lower return
Stock funds — Higher long-term growth potential with more volatility
International funds — Exposure to companies outside the U.S.
Common mistakes to avoid
⚠ Missing the Match
Not contributing enough to receive the full employer match means walking away from free compensation.
⚠ Cashing Out Early
Withdrawing before age 59½ usually triggers taxes plus a 10% early withdrawal penalty.
⚠ Ignoring Fees
High investment fees quietly reduce long-term growth. Even a 1% fee difference can cost tens of thousands over decades.
⚠ Never Increasing Contributions
Many workers stay at the same contribution rate for years. Gradually increasing contributions after raises can dramatically grow retirement savings.
What happens if you leave your job
Your 401(k) doesn't disappear when you quit or change employers. Usually you have four options:
Leave it where it is — Keep the account with your former employer's plan
Roll it into a new employer's 401(k) — Consolidate accounts
Roll it into an IRA — More investment flexibility and control
Cash it out — Usually the worst financial option because of taxes and penalties
What to do right now
If your employer offers a 401(k) match, contribute at least enough to receive the full match as soon as possible. If you're unsure how to invest, a low-cost target-date fund is often a reasonable default starting point for beginners. The most important factor for retirement wealth is usually consistency and time — not picking perfect investments.
Questions to ask your HR department or advisor
01Does my employer offer a matching contribution, and how does it work?
02What investment fees am I paying inside the plan?
03Should I choose Traditional or Roth contributions based on my tax bracket?
04What happens to my account if I leave the company?
05Am I fully vested in employer contributions yet?
06Can I increase my contribution percentage automatically each year?
Frequently asked questions
Is a 401(k) the same as a pension?
No. A pension is usually funded and managed by an employer with guaranteed retirement payments. A 401(k) is primarily funded by the employee, and the retirement balance depends on contributions plus investment performance.
Can I lose money in a 401(k)?
Yes. Most 401(k) money is invested in the stock or bond market, so balances can rise and fall over time. Long-term investing historically performs better than short-term investing, but no investment is guaranteed.
Can I borrow from my 401(k)?
Some plans allow 401(k) loans, but rules vary by employer. If you leave your job before repaying the loan, the remaining balance may become taxable and subject to penalties.
What age can I withdraw money without penalties?
Generally age 59½. Traditional 401(k) withdrawals are still taxable income, but the additional 10% early withdrawal penalty usually disappears after that age.
What's the difference between a 401(k) and an IRA?
A 401(k) is employer-sponsored with higher contribution limits. An IRA is an individual retirement account you open yourself. Many people use both together.