401(k) Explained: How It Works and How to Explain It to Employees

Most people describe a 401(k) as something they invest in. It isn't. A 401(k) is the account that holds your investments, and that single distinction clears up most of the confusion employees have about their retirement plan.

Here is the 401(k) explained in one pass. You choose a percentage of pay, and payroll moves it into your account before it reaches your bank. Your employer may add a match, and the money is invested in funds you select. The balance rises or falls with those funds until you withdraw it, ideally in retirement.

This guide walks through each piece in the order employees meet them. It flags the rules that differ from plan to plan, and it shows benefits and HR teams how to turn it all into an explainer video people finish.

TL;DR Short answer: A 401(k) is a workplace retirement account. Part of each paycheck goes in, your employer may add money, you pick investments inside the account, and you generally withdraw it in retirement under IRS and plan rules.

• Fastest way to explain it to employees: Turn a reviewed script into a captioned presenter video with HeyGen. When an annual limit changes, you edit one line and regenerate that scene instead of reshooting.
• Filming your benefits lead is still the better choice for a personal message from someone employees already know.
• A narrated slide deck is the quickest route when your enrollment deck already exists.
• Your recordkeeper's video library covers generic concepts at no cost.

What is a 401(k)?

A 401(k) is an employer-sponsored retirement plan that lets you save part of your wages in an individual account, usually with a tax advantage. The name comes from the section of the federal tax code that created it.

The easiest way to understand how a 401(k) works is to follow one dollar through it:

• Paycheck: You elect a percentage or flat amount of pay to contribute.
• Contribution: Payroll deposits that money into your 401(k) account each pay period.
• Employer money: If your plan offers a match or other employer contribution, it lands in the same account.
• Investments: The money is invested in funds from your plan's menu, or in the plan's default fund if you never chose.
• Growth: The balance changes with market performance, minus fees.
• Distribution: You take money out later. Taxes apply depending on whether you contributed traditional or Roth dollars.

Every question employees ask about their 401(k) sits somewhere on that path. A good explanation says which stage a question belongs to before it answers the question.

Why 401(k)s are hard to explain (and where video fits)

A new hire meets contributions, matching, tax treatment, fund selection, vesting and withdrawal rules in the same enrollment window. Each concept is simple on its own. Together, they read like a legal document, because the source material usually is one.

Video fixes the sequencing problem: one concept per scene, a visual for every number, and captions for anyone watching on mute. Once your benefits team approves the wording, HeyGen's educational video maker turns lesson notes, scripts, PDFs or slides into narrated, captioned video without a camera or editing software.

Production is the easy part. The harder part is deciding what employees need to hear and in what order, and that is what the rest of this guide covers.

That order matters more than polish. Strong benefits communication answers the employee's next question before they have to ask it. For a 401(k), that next question is almost always about the match.

How does a 401(k) work? The concepts every explainer needs

Employee contributions: the paycheck step

You decide how much of each paycheck goes into the plan, usually as a percentage. Many plans also use automatic enrollment, which starts contributions at a preset rate unless you change or decline it.

Your own contributions are always 100% yours. You cannot lose them by quitting, being laid off or switching jobs, whatever the plan's vesting schedule says about employer money.

Employer match and vesting: what your employer adds and when it's yours

A match is money your employer contributes based on what you contribute. Formulas vary, and some employers offer no match at all. Here is a hypothetical example: your employer matches 50% of your contributions up to 6% of pay. On a $60,000 salary, contributing 6% ($3,600) brings in $1,800 of match. Contributing 3% brings in $900.

Vesting answers the follow-up question: when is that employer money yours to keep? A plan can vest employer contributions in one of three ways:

• Immediately, so the money is yours as soon as it lands.
• All at once after a set period, called cliff vesting.
• Gradually each year, called graded vesting.

Federal rules cap cliff schedules at three years and graded schedules at six.

That is why match and vesting belong in the same explanation. Say you leave with $5,000 in matching contributions while 40% vested. You keep $2,000 of the match, plus every dollar you contributed yourself.

Traditional vs. Roth 401(k): paying tax now or later

Many plans offer both options. The difference between them is when you pay tax, not which one is better.

One wording trap: traditional contributions are tax-deferred, not tax-free. The tax arrives when you withdraw.

Investments: what your money is invested in

Contributing and investing are two separate decisions. Your contributions go into whatever you elected, or into the plan's default investment if you skipped that step. Check your account instead of assuming.

Most plan menus include a few common types of funds:

• Target-date funds: a single fund that shifts from stocks toward bonds as a chosen retirement year approaches, such as a "Retirement 2065 Fund."
• Index funds that track a market benchmark.
• Bond funds.
• A stable-value or cash-like option.

Understanding fees, diversification and how much risk you can tolerate matters more than chasing whichever fund did best last year.

2026 401(k) contribution limits

These figures change most years, so treat them as a scene you update annually. The IRS sets the 2026 contribution limits as follows:

The employee limit applies per person, not per plan. If you change jobs midyear and contribute to two 401(k)s, the $24,500 limit covers both combined.

Withdrawals, loans and early access

A 401(k) is built for retirement, but "you can't touch it until 59½" is too absolute. Withdrawals are generally taxable. Money taken before age 59½ can trigger a 10% additional tax unless an exception applies.

Some plans also allow loans or hardship distributions. Neither is guaranteed: your plan document decides whether they exist and under what conditions.

What happens to your 401(k) when you leave a job

Your vested balance stays yours. Nothing disappears when you quit, and you usually have four options:

• Leave it in the old plan, if the plan allows it, and keep managing the investments there.
• Roll it into your new employer's plan, if that plan accepts rollovers, to keep everything in one place.
• Roll it into an IRA, which often offers a wider choice of investments.
• Cash it out, which makes the money taxable and may add the 10% additional tax if you are under 59½.

In a direct rollover, the money moves straight from one plan to another account. That avoids the mandatory 20% tax withholding that applies when a taxable distribution is paid to you.

General 401(k) rules vs. your plan's rules

Many 401(k) explanations stop at federal rules. That leaves out half of what an employee needs, because the details that affect their paycheck are set by their employer's plan.

The document that fills in the right column is the Summary Plan Description (SPD). The Department of Labor's guide, What You Should Know About Your Retirement Plan, explains what plans must disclose and which details participants should check.

For benefits teams, this table doubles as a script plan. Every row on the left can be explained once for everyone. Every row on the right needs your plan's specific wording, and every explainer should end by pointing employees to the SPD.

How to create a 401(k) explainer video with HeyGen

1. Pull the facts from three sources

Use three sources:

• Federal rules for the universal concepts.
• Your SPD for the plan-specific details.
• Your recordkeeper's fund menu for investment options.

Keep them in a single working document, with the source noted next to each claim. This takes about 45 minutes if your SPD is current. Budget longer if the match formula or vesting schedule changed this year.

2. Write the script one concept per scene

Give each concept its own scene of roughly 60 to 90 seconds. Follow the money-flow order: paycheck, contribution, match and vesting, investments, taxes, leaving a job.

Write the way employees talk: "company match," "vested," "old 401(k)," "leave my job." A 90-second overview runs about 200 to 230 spoken words.

3. Lock the wording before you generate

Send the script to whoever owns plan accuracy: benefits, legal or your recordkeeper. Highlight every line that will need updating, such as the $24,500 limit, the match formula and the vesting years. That way reviewers know which sentences will change later.

Expect one or two review rounds. If you generate before approval, you will have to regenerate after it.

4. Build the video from the approved script

Paste the approved text into the editor. The script to video workflow splits it into scenes and adds narration, captions and supporting visuals, so you start from a structured draft instead of a blank timeline. For a 90-second overview, the first draft is ready to review in minutes. Most of your time will go into scene-level tweaks.

5. Choose a presenter and make every number visual

Pick a stock AI avatar or a digital twin of your benefits lead, then select the voice. Put each number on screen: a paycheck-to-account flow graphic, a vesting timeline bar, a traditional vs. Roth split screen.

Captions are generated automatically and stay synced to the narration. Choose 16:9 for your intranet or LMS and 9:16 for employees watching on their phones.

6. Localize, publish and schedule the yearly update

Publish the approved English version to your intranet or LMS first. For a multilingual workforce, AI dubbing creates versions in 177+ languages without filming again. Have a fluent reviewer check terms like "vesting" and "Roth," since financial vocabulary rarely translates word for word.

When next year's limits arrive, change the one line in the limits scene and regenerate only that scene.

Mistakes that make 401(k) explainers misleading

Calling traditional contributions "tax-free"

They are tax-deferred. An employee who hears "tax-free" can be surprised by the tax bill on their first retirement withdrawal. Say "you pay tax later, when you withdraw."

Explaining the match without the vesting schedule

A generous match sounds like free money, and the first question it raises is "what's the catch?" If the answer is a three-year cliff, say so in the same scene. Otherwise employees learn about vesting the week they resign.

Putting annual numbers in every scene

If the contribution limit appears in six places, next year's update means editing six scenes and hoping you caught them all. Put every annual figure in one labeled scene with the year on screen, so the yearly refresh is a single edit.

Telling everyone which fund, tax type or percentage to pick

An employer explainer should teach the decision, not make it. Explain how target-date funds work, what tax timing means and how the match rewards contributions. Leave "Roth is better for young people" and "save 15%" out of the script, because neither holds for every viewer.

Build a series, not a single video

A single 20-minute retirement video asks employees to absorb every decision at once. A short overview with focused follow-ups mirrors how employees search: one question at a time, usually when a decision is in front of them. The same logic applies to most training content that has to stay accurate year after year.

Consistency across modules builds trust. A custom avatar of your benefits lead can present every module in the series. Employees then see the same familiar face in the enrollment overview and in the rollover video they find six months later.

Other ways to produce a 401(k) explainer

The AI route has trade-offs of its own. Credit usage varies by model and video length, so it takes a cycle to learn what a module costs. The Free plan allows three videos a month of up to one minute each: enough to test an overview, not to run an enrollment season.

Film your benefits lead on camera

A recording of the person employees already email with questions carries built-in credibility.

• Pros: A trusted, familiar face; no new software to learn; a natural fit for live Q&A clips; strong for leadership messages.
• Cons: Every limit or plan change means a reshoot, which makes annual figures expensive to keep accurate. Scheduling, lighting and retakes stretch production across days.

Record a narrated slide deck or webinar

Most benefits teams already have an enrollment deck, and a screen recording with voiceover turns it into video in an afternoon.

• Pros: Reuses existing material; low cost; familiar presentation tools; charts carry over directly.
• Cons: Fixing one outdated slide usually means re-recording the narration around it. Sessions tend to run long and exist in one language only.

Use your recordkeeper's video library

Plan providers often publish general education videos participants can watch at no cost.

• Pros: Free to use; already reviewed by the provider; covers universal concepts well; no production work at all.
• Cons: It cannot mention your match formula, vesting schedule or fund menu, which are the details employees most need. The branding and tone belong to the provider, not your company.

The bottom line

A 401(k) rewards the employees who understand it early: the match they capture in year one, the vesting date they plan around, the old account they roll over instead of cashing out. None of that depends on memorizing tax code. It depends on hearing the right explanation at the moment each decision comes up.

That makes the explainer itself part of the benefit. Build the 60-second overview first, get the wording approved once, and keep the numbers in scenes you can update in minutes.

You can test that overview on HeyGen's Free plan, which includes three videos a month of up to one minute each. The paid plans add more:

• Creator costs $29/month ($24/month billed annually) and adds videos up to 30 minutes, 1080p export and watermark removal.
• Pro starts at $49/month and adds 4K export.
• Business costs $149/month plus $20 per additional seat and adds SCORM export, LMS integrations and interactive quizzes for enrollment season.

Compare every plan on HeyGen pricing. Then turn this year's 401(k) questions into videos employees watch before the enrollment deadline, not after.

Frequently asked questions

How much will $10,000 in a 401(k) be worth in 20 years?

There is no guaranteed figure, because returns vary. As an illustration only, $10,000 growing at 6% a year with no new contributions reaches about $32,000 in 20 years. At 4% it reaches about $21,900, and at 8% about $46,600. Fees, investment mix and market swings change the real result.

How much do you need in a 401(k) to get $1,000 a month?

A common planning shorthand, the 4% withdrawal guideline, points to roughly $300,000 for $12,000 a year. Treat that as a rough starting estimate, not a promise. Taxes on traditional withdrawals, investment returns, inflation and how many years you draw income can push the real number higher or lower.

How much should I contribute to my 401(k)?

There is no single right percentage. Many savers start with at least enough to receive the full employer match, if the plan offers one, since any match you skip is compensation left unclaimed. Beyond that, your budget, debts, emergency savings and retirement goals should set the number.

Can I cash out my 401(k) while still employed?

Only if your plan allows it. Some plans offer loans, hardship distributions or in-service withdrawals, often tied to age or specific needs. Withdrawals are usually taxable, and money taken before age 59½ can trigger a 10% additional tax unless an exception applies. Your Summary Plan Description lists the options.

Is a 401(k) the same as an IRA?

No. A 401(k) is offered through an employer, funded by payroll deductions and may include employer contributions. An IRA is an account you open yourself at a financial institution. It has a lower annual limit: $7,500 for 2026 versus $24,500 for 401(k) deferrals. Many people use both.

How long should a 401(k) explainer video be?

Aim for 60 to 90 seconds for the core overview. Then give each deeper topic, like vesting or rollovers, its own two- to three-minute module. Short modules are easier to finish, easier to find later and easier to update when a limit or plan rule changes.

Written byNick Warner