How to Start a 401(k) at Your Workplace

Starting a 401(k) happens through your employer, not on your own

You cannot open a 401(k) by yourself. Your employer must offer one, and you enroll through your company's benefits department or HR portal. The process usually takes 15 to 30 minutes and involves choosing how much of your paycheck to contribute and where to invest that money within the plan's available funds.

If your employer does not offer a 401(k), you have other retirement savings options — a traditional or Roth IRA, or a SEP IRA if you are self-employed. But if your workplace plan exists, starting one there is usually the first step because many employers match a portion of what you contribute.

Key Takeaways

• Your employer must sponsor a 401(k) plan for you to open one; you cannot start one independently.
• You choose a contribution percentage from each paycheck, and that money is deducted before taxes (in a traditional 401(k)) or after taxes (in a Roth 401(k)).
• Most employers match contributions up to a certain percentage — commonly 3% to 6% of your salary — so contributing enough to get the full match is usually the first financial priority.
• You select from a menu of investment funds offered by your plan; the plan administrator does not choose for you unless you opt into a default investment.
• Enrollment typically happens during your company's open enrollment period each year, or within 30 days of being hired if you are new.

When and how to enroll in your workplace plan

Most companies have an annual open enrollment period, usually in the fall, when you can start or change your 401(k) contributions. If you are newly hired, you can often enroll within 30 days of your start date without waiting for open enrollment. Check with your HR department or employee benefits website for the exact dates and enrollment method at your company.

Enrollment happens online through a benefits portal, by phone with your plan administrator, or sometimes on paper. Your HR team will send you instructions and the plan's summary document, which lists the investment options, employer match details, and vesting schedule. Read the match information first — that tells you the minimum you should contribute to capture information programs from your employer.

Choosing your contribution amount

You decide what percentage of your gross paycheck goes into the 401(k), ranging from 1% to 100% (though you must earn enough to cover taxes and living expenses). Most people start with 3% to 6%, which is often the amount their employer will match. If your employer matches 4% of salary, contributing 4% means you get the full match; contributing less leaves money on the table.

The IRS sets an annual contribution limit. For 2024, the limit is $23,500 for workers under 50, and $31,000 for workers 50 and older (the extra $7,500 is called a catch-up contribution). These limits change yearly. Your payroll system will not let you contribute more than the annual limit, so you do not need to calculate this yourself — the plan tracks it.

You can change your contribution percentage during open enrollment each year, or sometimes mid-year if you have a may have access to life event like marriage, a child, or a significant salary change. Check your plan's rules on when changes are allowed.

Selecting investments within the plan

After you choose how much to contribute, you pick where that money goes. Your 401(k) plan offers a menu of mutual funds, index funds, and sometimes company stock. You typically divide your contribution among these options — for example, 60% in a stock index fund and 40% in a bond fund.

If you do not choose, most plans have a default investment, usually a target-date fund that automatically shifts from stocks to bonds as you approach retirement. Choosing a target-date fund matching your expected retirement year is a straightforward option if you do not want to pick individual funds. Your plan's summary document lists all available funds, their past performance, and their expense ratios (the annual cost to own them).

You can change your investment selections during open enrollment or sometimes more frequently, depending on your plan. Changes you make typically take effect with your next paycheck.

Understanding employer matching and vesting

Many employers match your contributions — a common formula is 100% match on the first 3% you contribute, plus 50% match on the next 2%, for a total match of 4% of your salary. This means if you earn $50,000 and contribute 4%, your employer adds $2,000 to your account that year. This is not a loan; it is information programs.

Vesting is the schedule that determines when the employer's matching money becomes yours to keep. Some plans vest when ready (you own the match right away), while others vest gradually over three to six years. If you leave the company before you are fully vested, you forfeit the unvested portion of the match. Your plan summary shows the vesting schedule, so you know what happens to the match if you change jobs.

What happens after you enroll

Once you enroll, your chosen contribution percentage starts with your next paycheck. You will see the deduction on your pay stub. Your employer deposits both your contributions and any matching funds into your 401(k) account, usually within a few days of payroll processing.

You can log into your plan's website or app to see your account balance, review your investments, and track how much you have contributed year-to-date. Most plans send quarterly or annual statements showing your balance and investment performance. You do not need to do anything else unless you want to change your contribution amount or investment selections.

If your employer does not offer a 401(k)

Not all employers sponsor a 401(k). If yours does not, you can open an IRA on your own through a bank, brokerage, or investment company. A traditional IRA and a Roth IRA have lower annual contribution limits than a 401(k) — $7,000 for 2024 if you are under 50 — but they offer similar tax advantages and investment flexibility. A SEP IRA is an option if you are self-employed or a freelancer.

Some employers that do not offer a 401(k) may offer a straightforward IRA, which is a smaller retirement plan with lower administrative costs. Ask your HR department what retirement savings options are available to you.

Frequently Asked Questions

Can I start a 401(k) if I am part-time?

It depends on your employer's plan rules. Some plans require you to work a minimum number of hours per week or have been employed for a certain period before you can enroll. Check your plan summary or ask HR about part-time may be able to access. If your employer does not include part-time workers, you can open an IRA independently.

What if I do not know how much to contribute?

Start by contributing enough to capture your employer's full match — that is the minimum to avoid leaving information programs behind. If your employer matches 4%, contribute 4%. Once you are comfortable with that, you can increase your contribution percentage during the next open enrollment period.

Can I change my contribution amount after I enroll?

Yes, during open enrollment each year. Some plans also allow mid-year changes if you have a may have access to event like a marriage, birth, or job change. Contact your HR department or plan administrator to request a change outside of open enrollment.

What if I leave my job after starting a 401(k)?

Your money stays in the 401(k) unless you withdraw it. You can leave it there, roll it into your new employer's plan if they offer one, or roll it into an IRA. You cannot contribute to it anymore once you leave the company, but your existing balance continues to grow based on your investment selections.

Do I have to invest in company stock?

No. Company stock is usually one option among many in the plan's investment menu, but you are not required to choose it. Most financial advisors suggest limiting company stock to a small portion of your portfolio to avoid having too much money tied to one company's performance.