If you have worked a full-time job, you have probably been handed a 401(k) enrollment form. A 401(k) is an employer-sponsored account that lets you invest part of your paycheck for retirement and lowers your taxes either now or later, depending on the type you choose. The single most important thing to get right is contributing enough to capture your full employer match.

With a traditional 401(k), your contribution comes out before income tax, so you owe nothing on that portion of your pay now and pay ordinary income tax when you withdraw the money in retirement. Contributions are deducted automatically from each paycheck, which makes it a set-and-forget way to save. It differs from other retirement accounts mainly in that it is tied to your job and has a limited menu of investments.

Many employers match part of what you put in, often 2% to 6% of your salary. If your plan offers a match, contribute at least enough to get all of it. Anything less is leaving guaranteed money on the table.

In tax terms, a 401(k) is a “qualified” plan, meaning the IRS grants it tax benefits in exchange for following set rules; the name comes from the section of the tax code that created it. A pension is also a qualified plan, but a pension is “defined-benefit” (your payout is set by a formula based on salary and years of service) while a 401(k) is “defined-contribution” (your balance is whatever you and your employer put in, plus investment growth). Both differ from non-qualified deferred compensation plans, which are built for executives and other very high earners.

Roth 401(k)s - another available tax option

A Roth 401(k) takes contributions after tax, so qualified withdrawals in retirement come out tax-free. Employers cannot put matching money into a Roth 401(k); any match goes into a companion traditional 401(k) and is taxed on withdrawal. Because a Roth 401(k) adds payroll and recordkeeping overhead, some employers do not offer one, though that is becoming less common.

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Getting set up with your 401(k)

Even though your employer sponsors the plan, a few setup steps are on you.

1. Sign up. Your employer may enroll you automatically, but confirm it with HR. Some plans have a waiting period, often three to six months of service, before you can join; if so, set a reminder to enroll when you are eligible.
2. Review the investments. Most plans offer 10 to 20 funds. Your employer likely set a default, usually a target-date fund, which is fine unless the fees are high. Check the expense ratio on each fund and think twice about anything charging more than 1%.
3. Contribute at least up to the match. A match is an immediate return on your money. If your employer matches 5%, contribute at least 5%. Even if you do nothing else with the account, do that.

What are the 401(k) contribution limits?

For 2026, you can contribute up to $24,500 of your own pay to a 401(k), up from $23,500 in 2025. If you are 50 or older, you can add an $8,000 catch-up for a total of $32,500. If you turn 60, 61, 62, or 63 during 2026, your catch-up is $11,250 instead, for a total of $35,750.

Employer contributions do not count against your personal limit, but they count toward a combined cap. For 2026, everything going into the account, your deferrals plus the employer match plus any after-tax contributions, is capped at $72,000, or $80,000 with the age 50 catch-up.

If your employer classifies you as a “highly compensated employee” (HCE), your contributions may be limited further. Nondiscrimination testing keeps the average deferral rate of HCEs within a set margin of the rate for everyone else, and if the plan fails the test, it may have to refund part of your contributions after year-end.

What are my 401(k) investment options?

Your choices depend on the firm your employer hired to run the plan, often Vanguard or Fidelity, which typically offer their own funds. You can pick among those funds but not outside them. That is the main tradeoff against an IRA, which you open yourself and can invest in almost anything.

What are my 401(k) distribution rules?

You generally cannot withdraw from a 401(k) before age 59 1/2 without a qualifying event, and an early withdrawal usually costs ordinary income tax plus a 10% penalty. Unlike an IRA, which lets you withdraw for any reason (still subject to tax and any penalty), a 401(k) withdrawal requires one of these:

• Leaving the job for any reason, including retirement
• Reaching 59 1/2
• Death
• A specific hardship as defined by the plan
• Termination of the plan

401(k) rollovers

A rollover moves the balance of an old 401(k) into an IRA or your new employer’s 401(k) after you leave a job. Over a career you may accumulate several 401(k)s, and consolidating them makes your savings easier to track and your required minimum distributions easier to calculate. Rolling into an IRA also frees your investments from a former employer’s fund menu.

Start the rollover with your old plan’s administrator, and always choose a direct rollover, where the money moves straight from the old account to the new one with no tax withheld. In an indirect rollover, the check comes to you, and if you do not deposit it into a qualified account within 60 days, the whole amount becomes a taxable distribution plus the 10% penalty if you are under 59 1/2. You get one tax-free indirect IRA-to-IRA rollover per 12 months; direct rollovers and rollovers involving employer plans are not limited.

Required minimum distributions (RMDs)

You can take penalty-free 401(k) withdrawals starting at 59 1/2, but you are not required to start until your RMD age. Under current law that is 73 if you were born between 1951 and 1959, and 75 if you were born in 1960 or later. Your first RMD is due by April 1 of the year after you reach that age; every RMD after that is due by December 31. One exception: if you are still working for the employer that sponsors the plan and do not own more than 5% of the company, you can delay RMDs from that 401(k) until you retire.

Withdrawals from a traditional 401(k) are taxed as ordinary income.

Taking a loan out of your 401(k)

Some plans let you borrow from your 401(k), up to the lesser of 50% of your vested balance or $50,000. Repayment is usually within five years, longer if the loan is for a primary residence. The 2020 CARES Act temporarily raised the limit to $100,000 for people affected by the pandemic, but that applied only to loans taken in 2020 and has since expired.

The appeal is that the interest you pay goes back into your own account rather than to a bank. The cost is the growth that money misses while it is out of the market, and the risk that leaving your job accelerates repayment: an unpaid balance is treated as a distribution, taxable and subject to the 10% penalty if you are under 59 1/2. A cash emergency fund is the better first line of defense, and as a rule 401(k) loans are worth avoiding.

What if my employer doesn't offer a 401(k)?

You still have options. A nonprofit or school may offer a 403(b), and state or local government jobs often have a 457 plan; both work much like a 401(k) with different eligibility rules. Anyone with earned income can open an IRA at a brokerage, with far more investment freedom than a 401(k) but a lower contribution limit: $7,500 for 2026, or $8,600 if you are 50 or older. If you are self-employed, you can choose among a SEP IRA, SIMPLE IRA, solo 401(k), or defined benefit plan, each with its own tradeoffs.

Bottom Line

For most people, a 401(k) is a core piece of the retirement plan: easy to fund through payroll, tax-advantaged, and often boosted by an employer match. If your plan offers a match, contribute at least enough to get all of it. Everything else, the fund choices, the Roth-versus-traditional decision, whether to roll over an old account, matters less than not walking away from free money.

Frequently Asked Questions

What is a good starting amount for 401k?

Most financial experts suggest contributing 10% to 15% of your income to a 401(k), but any amount beats nothing. If your employer matches 5%, contributing 10% of your own pay gets you to 15% right away. A common approach is to raise your contribution rate by 1 percentage point each year, often timed to a raise so you do not feel the cut.

Is 50 too late to start a 401(k)?

It is not too late to start a 401(k) at 50. You also gain access to catch-up contributions at 50, an extra $8,000 in 2026 on top of the $24,500 limit, and $11,250 from ages 60 to 63. Combined with an employer match and 15-plus years of compounding before a typical retirement age, a late start still builds a meaningful balance.

Can I move 401k to CD without paying taxes?

You can move a 401(k) into a CD tax-free only if it is an IRA CD, meaning a certificate of deposit held inside an IRA. Roll the 401(k) directly into an IRA, then invest those funds in an IRA CD. Withdrawals are later taxed as ordinary income (or are tax-free from a Roth IRA CD), and taking money out before age 59 1/2 can trigger taxes and penalties, on top of the bank’s early-withdrawal penalty on the CD itself.

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