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401(k) Basics: Employer Plans

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401(k) Basics: Employer Plans

A 401(k) is an employer-sponsored retirement plan where you contribute pre-tax dollars from your paycheck, which reduces your taxable income. If your employer offers a match, capturing it is almost always the first financial priority: it is free money with an immediate 50%–100% return.

Key takeaways​

  • Contributions reduce your taxable income dollar-for-dollar (pre-tax option) and grow tax-deferred until retirement.
  • The 2024 contribution limit is $23,500; if age 50 or older, you can contribute an additional $7,500 (catch-up).
  • Employer matches are free money; a 50% match on the first 6% of salary is a guaranteed 50% instant return on those contributions.
  • Vesting determines when employer contributions become fully yours; common schedules are cliff (three-year) or graded (six-year).
  • Withdrawals before age 59.5 are subject to income tax plus a 10% penalty, with narrow exceptions for hardship.

How 401(k) contributions reduce your tax bill​

When you enroll in a 401(k) and elect to contribute $500 per paycheck, that $500 is taken from your gross income before federal and state income tax is calculated. This is called a pre-tax contribution. If you normally earn $2,500 per paycheck and contribute $500 to a 401(k), your taxable income for that pay period is $2,000. At a 24% marginal federal tax rate, you save $120 in federal tax that period. Over a year of bi-weekly pay, a $500 bi-weekly contribution ($13,000 annually) saves roughly $3,120 in federal tax and state income tax combined.

This is the first appeal: immediate tax reduction. Your take-home pay drops less than the contribution because the contribution itself reduces your tax liability. Contributing $13,000 to a 401(k) might only reduce your take-home by $10,000 if you are in a 24% combined federal and state bracket.

The contributions grow tax-free inside the 401(k) account until you withdraw. Unlike a taxable brokerage account, you do not pay tax on dividends or capital gains while the money is invested. If $13,000 grows at 7% annually for 30 years, it compounds to approximately $99,000. In a taxable account with annual tax drag, the same $13,000 might only grow to $65,000. The tax-free compounding advantage of a 401(k) is substantial over decades.

However, withdrawals are fully taxable as ordinary income in retirement. A $500,000 401(k) balance withdrawn at a $20,000 per year rate over 25 years means $20,000 of annual taxable income added to your retirement income. At a 22% effective rate in retirement, you owe $4,400 in tax on that $20,000 withdrawal.

Employer match: free money you cannot ignore​

An employer match is a contribution made by your employer to your 401(k) based on your contributions. A common match formula is 50% of the first 6% of salary. This means:

  • If you contribute 6% of your salary to a 401(k), your employer contributes an additional 3% (50% match).
  • If you contribute less than 6%, your employer matches half of that lower amount.
  • If you contribute more than 6%, your employer still contributes only 3%.

A concrete example: you earn $80,000 annually and contribute 6% to your 401(k). Your contribution is $4,800. Your employer contributes an additional $2,400 (50% of $4,800). Your total 401(k) funding for the year is $7,200 — your $4,800 plus $2,400 free money from your employer.

This is an immediate 50% return on the contributed amount. You contributed $4,800 and received $2,400 of matching employer contribution for free. There is no investment outcome needed; the return is automatic. If you then invest that $7,200 at 7% annual growth for 30 years, it becomes $52,800. But the "free" $2,400 would have become $18,000 of that $52,800 — pure employer generosity.

Any household with access to an employer match should contribute at least enough to capture the full match. This is the highest-return investment available to most people: a guaranteed immediate return from the employer, with no market risk. Forgoing an employer match is equivalent to leaving cash on the table.

Some employers offer different match formulas — 100% of the first 3% of salary, or graded matches up to 4% of salary. The principle is the same: find the "fully matched" level and contribute to it.

The $23,500 annual limit (2024)​

The IRS caps 401(k) contributions at $23,500 per year (2024). This limit is adjusted annually for inflation and typically rises $500–$1,000 per year. If you contribute more than the limit, the excess is not only over-the-limit but also non-deductible; it creates tax complications. Most payroll systems prevent over-contribution, but if you have multiple employers or make a large catch-up contribution, it is worth tracking.

For employees age 50 or older, an additional $7,500 catch-up contribution is allowed, raising the total to $31,000. This is meant to help older workers catch up if they did not save aggressively earlier. If you are 50, maximize the full $31,000 to ensure adequate retirement savings.

The limit applies per person, not per employer. If you work for two employers simultaneously (rare, but possible), your combined contributions across both 401(k)s cannot exceed $23,500. Each employer's plan is separate, but the IRS combines them for limit purposes. If you contribute $15,000 to one employer's 401(k) and then switch employers and contribute $12,000 to the new employer's plan, you have exceeded the limit. The excess is subject to double taxation (once when earned, once when withdrawn) and penalties. Avoid this by tracking total contributions across employers.

Vesting: when employer match becomes yours​

Employer matching contributions are not automatically yours the moment they are deposited. Most employers require vesting — a waiting period before matching contributions are fully in your possession. If you leave the employer before the vesting schedule completes, you forfeit some or all of the unvested match.

The two most common vesting schedules are:

Cliff vesting: You receive 0% of the employer match until you have been with the employer for a certain period (usually three years), then you receive 100%. If you leave after 2.9 years, you receive nothing. If you leave after 3.1 years, you receive 100%.

Graded vesting: You receive increasing percentages over time. A common six-year graded schedule might give you 20% per year: 0% if you leave after one year, 20% after two years, 40% after three years, and so on, reaching 100% after six years.

The cliff schedule is both a blessing and a curse. It encourages longer tenure (the employer keeps more matching contributions if you leave early), but if you find a better job opportunity at month 35, you suddenly lose all matching money left in the employer's hands. Graded vesting is more forgiving; you always retain some of your match.

When evaluating a job offer, ask about the vesting schedule. A 401(k) match is only valuable if you will be at the employer long enough to vest. A job offer from a startup with a three-year cliff and a 3% match might look less attractive than a job with a stable employer and an immediate 50% match. Consider the risk of early departure.

Early withdrawal penalties and exceptions​

You cannot withdraw from a 401(k) before age 59.5 without penalty. If you withdraw before this age, you owe income tax on the entire amount plus a 10% early-withdrawal penalty. On a $50,000 withdrawal in your 40s, at a 24% combined tax rate, you owe $12,000 in tax plus $5,000 in penalty — $17,000 for $50,000 of spending, a devastating 34% tax rate.

Narrow exceptions exist:

  • Substantially equal periodic payments (SEPP / Rule 72(t)): You can withdraw penalty-free (but still taxable) if you commit to withdrawing the same amount for at least five years or until age 59.5, whichever is longer. This requires detailed calculation and IRS approval; it is not casually executed.
  • Disability: If you become permanently disabled, you can withdraw without penalty.
  • Death: If you die, beneficiaries can withdraw without early-withdrawal penalty.
  • Hardship withdrawals: Some plans allow hardship withdrawals for home purchase, medical bills, or tuition, but penalties still apply. Hardship is narrowly defined and rarely granted.

For most people, 401(k)s are essentially locked until 59.5. If you need cash before then, a taxable brokerage account or Roth IRA (contributions can be withdrawn penalty-free) are better vehicles.

Traditional vs. Roth 401(k)​

Some employers offer both Traditional (pre-tax) and Roth 401(k) options. Roth 401(k) contributions are made after-tax but grow tax-free and are withdrawn tax-free in retirement. The choice parallels the Traditional vs. Roth IRA decision: if you expect lower income in retirement, Traditional wins. If you expect similar or higher income, Roth is safer.

One unique advantage of Roth 401(k): the contribution limit is the same ($23,500 in 2024), but the limit is separate from Traditional 401(k) contributions. You cannot contribute $23,500 to Traditional and another $23,500 to Roth; the combined limit is $23,500. Splitting contributions between the two is allowed.

Process flowchart​

Next​

Once your 401(k) strategy is set, the next question is whether your employer offers other specialized plans. Teachers, nonprofit employees, and government workers have access to 403(b) and 457 plans with different rules and unique withdrawal flexibilities.