401(k) Basics for Beginners — What It Is, How It Works

Employer match is free money — always capture it first. Beyond that: know your vesting schedule, understand the traditional vs. Roth difference, and learn what to do when you leave. Brian walks through 401(k) basics so you start with the right foundation.

Key takeaways

A 401(k) is an employer-sponsored defined-contribution retirement account: contributions come out of your paycheck pre-tax (traditional) or after-tax (Roth), and the investments grow inside the account.
The four things to know: contribution limits, employer match, vesting schedule, and traditional vs. Roth.
In the investing sequence, the 401(k) match comes first — it is the highest-certainty return available. After that, Roth IRA, then HSA, then back to 401(k).
When you leave an employer, you can roll the balance to an IRA, leave it with the old plan, roll it to your new employer's plan, or cash out (with tax and penalty consequences).
This is general financial education. It is not personalized investment or tax advice. Consult a registered investment advisor (RIA) or tax professional for your specific situation. Plan rules and IRS limits change — verify current figures with IRS.gov or your plan administrator.

Education disclaimer

This is general financial education. ClearValue Lending is not a registered investment advisor (RIA) and does not provide personalized investment or tax advice. 401(k) plan rules vary by employer. IRS contribution limits are adjusted annually. Verify current limits and your plan's specific rules with IRS.gov or your plan administrator before making contribution decisions.

A 401(k) is probably the most common retirement savings tool available to American workers — and also one of the most misunderstood. Most people know they should contribute to one. Far fewer understand the four levers that actually determine how much it benefits them: contribution limits, employer match, vesting, and the traditional vs. Roth choice. Brian's video above walks through the basics. This editorial layer adds the structural framework and primary-source numbers.

What a 401(k) is

A 401(k) is an employer-sponsored defined-contribution retirement plan governed by Section 401(k) of the Internal Revenue Code. 'Defined-contribution' means the benefit you receive in retirement depends on how much you contributed and how the investments performed — not a predetermined monthly payment (that's a pension, or defined-benefit plan).

Contributions are deducted directly from your paycheck — pre-tax for traditional 401(k), after-tax for Roth 401(k).
Investment options are selected by your employer's plan — typically a menu of mutual funds or target-date funds.
Tax advantages mean the investments compound without annual capital-gains or dividend taxes eating into growth while the money stays in the account.
Employer match is additional employer contributions tied to your own contributions — the most common form of compensation you can leave on the table.

The four things to know

1. Contribution limits

2025 IRS 401(k) contribution limits

Employee elective deferral limit: $23,500 for 2025. This is the maximum you can contribute from your own paycheck, across all 401(k) plans you participate in. — IRS — 401(k) contribution limits
Catch-up contribution for ages 50–59 and 64+: an additional $7,500, bringing the total to $31,000 for eligible participants. — IRS — Retirement Topics: Catch-Up Contributions
SECURE 2.0 Act enhancement (2025+): participants aged 60–63 may make a higher catch-up contribution of $11,250 (instead of $7,500), bringing their total to $34,750. Verify the applicable limit for your age group with IRS.gov. — IRS — SECURE 2.0 Act changes affecting retirement plans
These limits apply to the employee's own contributions. Employer contributions (match, profit-sharing) are in addition and subject to a separate combined limit ($70,000 in 2025). The annual limits are adjusted periodically by IRS COLA announcements — verify current-year limits at IRS.gov. — IRS — 401(k) and Profit-Sharing Plan Contribution Limits

IRS adjusts limits annually

The figures above reflect IRS announcements as of the 2025 tax year. The IRS adjusts 401(k) contribution limits annually for cost-of-living. Always verify the current-year limit at IRS.gov or with your plan administrator before making contribution decisions.

2. Employer match

The employer match is the most important lever in a 401(k) — and the most frequently left uncaptured. A common structure is a 50% or 100% match on contributions up to a set percentage of salary. The principle: contribute at least enough to capture the full match before considering other investment vehicles. Stopping short of the match threshold means declining part of your compensation.

Match structures vary by plan

Match formulas are set by the employer, not by law. Common examples: '100% match up to 3% of salary,' '50% match up to 6% of salary.' Your Summary Plan Description (SPD) — a required disclosure document your employer must provide — shows your plan's specific match formula and any waiting periods.

3. Vesting schedule

You always own 100% of your own contributions immediately. Employer contributions (the match) are typically subject to a vesting schedule — a timeline that determines what percentage of the employer's contributions you keep if you leave.

Vesting schedule types

Type	How it works	Practical effect
Cliff vesting	0% ownership until a specific date (e.g., 3 years), then 100%	Leaving just before the cliff means forfeiting all employer contributions
Graded vesting	Percentage increases over time (e.g., 20% per year over 5 years)	Partial credit for partial tenure — you keep what's already vested when you leave
Immediate vesting	100% ownership of employer contributions from day one	No vesting risk — full employer contribution is yours immediately

ERISA (the Employee Retirement Income Security Act) sets maximum vesting schedules employers can use. Under current rules: cliff vesting must complete by year 3; graded vesting must be 100% complete by year 6. Your plan's Summary Plan Description (SPD) shows the specific schedule. If you're considering leaving an employer, know your vesting date first.

4. Traditional vs. Roth 401(k)

Traditional vs. Roth 401(k)

Feature	Traditional 401(k)	Roth 401(k)
Contributions	Pre-tax — reduces taxable income today	After-tax — no current-year tax benefit
Taxes on growth	Tax-deferred — no annual tax on gains	Tax-free — no tax on qualifying withdrawals
Withdrawals in retirement	Taxed as ordinary income	Tax-free (qualified distributions)
Required Minimum Distributions	Yes — starting at age 73 (SECURE 2.0)	RMDs eliminated starting 2024 (SECURE 2.0)
Best for	Expecting lower tax rate in retirement	Expecting higher tax rate in retirement (or tax-free income priority)

The choice between traditional and Roth 401(k) turns on your tax situation — present vs. future. Neither is universally better. The conventional framing: if you expect to be in a lower tax bracket in retirement than today, traditional contributions save taxes now. If you expect to be in a higher bracket, Roth locks in today's lower rate. Many people benefit from having both — tax diversification across account types gives flexibility in retirement to manage taxable income. This is a personal finance decision; consult a tax professional for guidance specific to your situation.

Where the 401(k) fits in the investing sequence

The investing sequence: account priority order

401(k) up to employer match: Contribute first — the match is an immediate return on your contribution before the market does anything.
Roth IRA (if eligible): After capturing the full match, a Roth IRA's after-tax contributions grow tax-free. 2025 limit: $7,000 ($8,000 if 50+).
HSA (if on a high-deductible health plan): Triple-tax-advantaged: deductible contributions, tax-free growth, tax-free withdrawals for qualified medical costs.
Back to 401(k), then taxable accounts: After Roth + HSA, return to maximize the 401(k) before opening taxable brokerage accounts. Taxable accounts have no contribution limits but no tax-shelter

The employer match is the highest-certainty return available in investing. It comes before everything else in the sequence — before index funds, before a Roth IRA, before any other vehicle.
— Brian's ClearValue Lending Team

What happens when you leave an employer

When you change jobs or retire, you have four options for your 401(k) balance:

Leaving your employer — 401(k) options

If You want maximum investment flexibility and a clean slate: Roll over to an IRA. A direct rollover to a traditional IRA (if traditional 401k) or Roth IRA (if Roth 401k) is tax-free and preserves the tax-advantaged status. You typically gain access to a wider fund menu than most employer plans offer.
If Your old plan has unusually low-cost institutional funds or you have no new plan yet: Leave it with your former employer. You keep the investments; you lose the ability to make new contributions. Check whether your plan charges fees for terminated employees — some do after a balance falls below a threshold.
If Your new employer has a good plan and you want simplicity: Roll over to your new employer's 401(k). Consolidates balances and keeps the money in a plan structure. Not all plans accept incoming rollovers — check with your new plan administrator.
If You need the money now and accept the tax consequences: Cash out (with significant tax and penalty cost). Early withdrawals before age 59½ are subject to ordinary income tax PLUS a 10% early withdrawal penalty. This option is almost always the most expensive — understand the full cost before proceeding.

Rollover vs. withdrawal: the critical difference

A direct rollover moves the balance institution-to-institution — you never receive the funds, there's no withholding, and no taxes are due. A withdrawal (or indirect rollover where you receive a check) triggers mandatory 20% federal withholding and potentially the 10% early withdrawal penalty. If you're leaving a job, request a direct rollover. The IRS Rollover Chart (Publication 590-A) shows eligible rollover paths.

Compare IRA options for rollovers

For most people rolling a 401(k) into an IRA, the right question isn't which brokerage — it's which account type (traditional vs. Roth) and which investment mix makes sense for your timeline. ClearValue Lending's retirement and investing matcher can help you think through the sequence. We're an educational platform — not an investment advisor or brokerage.

Related resources

How to Think About Investing Your Money — A Framework — the full account-priority sequence, asset allocation, and product selection framework
What lenders look for — underwriting signals across financing products, useful context if you're also thinking about business capital
APR vs. factor rates — cost-of-capital math that applies across lending and investing contexts

Frequently asked questions

What is the 401(k) contribution limit for 2025?

The IRS employee elective deferral limit for 2025 is $23,500. Participants aged 50–59 and 64+ can contribute an additional $7,500 catch-up, for a total of $31,000. Under SECURE 2.0, participants aged 60–63 have a higher catch-up limit of $11,250, for a total of $34,750. These limits are adjusted annually by the IRS — verify the current year's limit at IRS.gov before acting.

What's the difference between a traditional and Roth 401(k)?

A traditional 401(k) takes contributions pre-tax, reducing your taxable income today. Withdrawals in retirement are taxed as ordinary income. A Roth 401(k) takes after-tax contributions — no upfront tax deduction — but qualified withdrawals in retirement are tax-free. Under SECURE 2.0, Roth 401(k) accounts are no longer subject to required minimum distributions (RMDs) starting in 2024. The better choice depends on your current vs. expected future tax rate — a decision that benefits from input from a tax professional.

What is vesting and why does it matter?

Vesting is the schedule that determines what percentage of your employer's contributions (the match) you own if you leave. You always own 100% of your own contributions immediately. Employer match is typically subject to cliff vesting (0% until a certain date, then 100%) or graded vesting (incremental percentage each year). ERISA caps the maximum vesting period: cliff vesting must complete by year 3; graded vesting must be 100% by year 6. Knowing your vesting date before you leave an employer is essential — leaving before you're fully vested means forfeiting employer contributions.

What happens to my 401(k) if I leave my employer?

You have four options: (1) roll over to an IRA — typically the most flexible, preserves tax-advantaged status; (2) leave it with your former employer's plan — keeps the investments but you can no longer contribute; (3) roll over to your new employer's plan if they accept incoming rollovers; or (4) cash out — the most expensive option, triggering income tax plus a 10% early withdrawal penalty if you're under age 59½. For a direct rollover, request institution-to-institution transfer to avoid withholding.

Should I contribute to a 401(k) even if the investment options aren't great?

The general principle: contribute at least enough to capture the full employer match, regardless of investment options. The match is an immediate return on your contribution — declining it means declining part of your compensation. Beyond the match, the quality of the plan's fund menu becomes more relevant. If your plan charges high fees or offers only high-cost funds, the calculus for contributions beyond the match may shift — which is why the typical sequence suggests maxing an IRA before returning to the 401(k) above the match. Consult an RIA for guidance specific to your plan.