Employer Payroll Funding (401(k))

A 401(k) is the most tax-efficient way to save for retirement through employment. Contributions reduce your taxable income, employer matches are free money, and growth is tax-deferred. Setting it up correctly during onboarding can save you tens of thousands in taxes over your career.

Key takeaways

• 401(k) contributions are deducted from your gross salary before income taxes, reducing your tax liability that year
• The 2024 contribution limit is $23,000 per year (or $30,500 if age 50+)
• Employer matches are free money; at minimum, contribute enough to capture the full match
• Vesting schedules determine when employer match contributions become yours; typically 3–6 years for full vesting
• Pre-tax and Roth 401(k) offer different tax tradeoffs; most people benefit from pre-tax early in their career

How Pre-Tax 401(k) Contributions Work

Your employer offers a 401(k) plan through a plan administrator (typically a company like Fidelity, Vanguard, or Schwab). When you start employment, you're invited to enroll during onboarding. You choose a contribution rate (typically a percentage of your salary, e.g., 6% or a fixed dollar amount).

When payroll is processed, the contribution is deducted from your gross salary before income tax is calculated. This reduces your taxable income for the year.

Example: You earn $60,000 per year and contribute $6,000 (10%) to a pre-tax 401(k).

• Gross salary: $60,000
• 401(k) contribution: −$6,000
• Taxable income: $54,000
• Income tax at 22% rate: $11,880 (instead of $13,200 if you didn't contribute)
• Tax savings: $1,320

The $1,320 tax savings is immediate—you see it reflected in your net paycheck, which doesn't shrink as much as it would without the 401(k) contribution. This is what makes pre-tax 401(k) so powerful: you're investing $6,000 but your take-home income only drops by roughly $4,680 ($6,000 − $1,320 tax savings).

Employer Matches: Free Money

The real benefit of 401(k)s is the employer match. Most employers who offer 401(k)s also offer to match a portion of your contributions.

Common match formulas:

• 100% match up to 3%: For every $1 you contribute (up to 3% of salary), your employer contributes $1. If you earn $100,000 and contribute $3,000 (3%), your employer adds $3,000.
• 50% match up to 6%: For every $1 you contribute (up to 6% of salary), your employer contributes $0.50. If you contribute $6,000 (6%), your employer adds $3,000.
• Discretionary match: The employer decides the match percentage each year, usually 0–3%.

Example with 100% match up to 3%: You earn $60,000 and contribute 3% ($1,800).

• Your contribution: $1,800
• Employer contribution: $1,800
• Total in your 401(k): $3,600
• Your out-of-pocket cost (after tax savings): $1,800 − ($1,800 × 22% tax rate) = ~$1,404

You've invested $3,600 for $1,404 of your own money. The employer contribution is a 128% instant return.

Critical rule: Always contribute enough to capture the full employer match, even if you're paying down debt or building an emergency fund. There is no investment you can make (stocks, bonds, savings account) that guarantees a 50–100% return. Leaving the employer match on the table is leaving free money behind.

Vesting Schedules

Here's the catch: employer match contributions are subject to a vesting schedule. You own your own contributions immediately (100% vested), but the employer's contribution "vests" gradually over time. If you leave the company before you're fully vested, you forfeit the unvested portion of the employer match.

Common vesting schedules:

• Immediate: You own the match as soon as it's deposited. Rare, but excellent if offered.
• 3-year cliff: You own 0% of the match if you leave within 3 years, and 100% if you leave after 3 years.
• Graduated (6-year): You own 20% after 2 years, 40% after 3 years, 60% after 4 years, 80% after 5 years, 100% after 6 years.

Example with 3-year cliff: You join a company, they match your $1,800 contribution with $1,800 of their own.

• Year 1: You own your $1,800, they own their $1,800 (you can't touch theirs)
• Year 2: Same situation
• Year 3, Day 1: You're fully vested. You own both your $1,800 and their $1,800.
• If you resign on Year 3, Day 0: You take your $1,800 and forfeit their $1,800.

This vesting schedule is why the employer match is genuinely valuable only if you stay at the company long enough to vest. If you change jobs every 2 years, you forfeit the match each time.

However, some employers accelerate vesting if you reach a certain age (e.g., age 65) or tenure (e.g., 10 years), even if you quit. Check your plan documents.

Pre-Tax vs. Roth 401(k)

Most employers offer two types of 401(k) contributions:

Pre-Tax 401(k)

• Contribution: Deducted before income tax; reduces your taxable income this year
• Growth: Tax-deferred; you don't pay tax on gains inside the account
• Withdrawal in retirement: Taxed as ordinary income when withdrawn
• Best for: People in high tax brackets now who expect to be in lower brackets in retirement

Roth 401(k)

• Contribution: Deducted after income tax; does not reduce your taxable income this year
• Growth: Tax-free; you don't pay tax on gains inside the account
• Withdrawal in retirement: Tax-free (no tax on gains or contributions)
• Best for: People in low tax brackets now who expect to be in higher brackets in retirement

For most employed people, pre-tax 401(k) is the better choice early in your career (when you're in a lower tax bracket) because the tax deduction is worth more. If you expect your income to increase significantly, switching to Roth after a raise can make sense.

Example: You're earning $50,000 in a 12% tax bracket. A $6,000 pre-tax 401(k) contribution saves you $720 in taxes. But if you expect to earn $150,000 later and be in a 32% bracket, the Roth 401(k) might be better for that $6,000, because the tax-free growth and withdrawals will be worth more in the 32% bracket.

The math is complex, and most people don't change strategies frequently. A simple rule: Use pre-tax early in your career, consider Roth later when your income is high.

Contribution Limits and Catch-Up Contributions

The IRS sets annual contribution limits:

• 2024: $23,000 per year (under 50), $30,500 (age 50+, including $7,500 catch-up)
• 2025: Limits typically increase $500–$1,000 per year for inflation

The limit is per person, not per employer. If you work two jobs and both offer 401(k)s, your combined contributions cannot exceed the limit. If you exceed the limit, the excess is subject to penalties.

Catch-up contributions are extra contributions allowed for people age 50 and older. In 2024, you can contribute an extra $7,500 on top of the $23,000 limit, for a total of $30,500. This acknowledges that people near retirement want to boost contributions.

When to Contribute to 401(k) vs. IRA vs. Taxable Brokerage

The typical strategy:

1. Maximize employer match in your 401(k) (contribute enough to capture 100% of the match)
2. Max out Roth IRA ($7,000 per year in 2024) if income allows
3. Return to 401(k) and contribute remaining amount up to the limit
4. Use taxable brokerage for amounts beyond retirement account limits

This ordering prioritizes the employer match (guaranteed return), then Roth (tax-free growth), then pre-tax 401(k) (tax-deferred growth), then taxable (no shelter).

However, if your 401(k) plan has excellent low-cost funds (Vanguard or Fidelity index funds) and your Roth IRA would use the same funds, either order works. The important part is maximizing the match and staying within limits.

Changes During Employment

You can change your 401(k) contribution rate during the year by logging into your plan's website or contacting HR. Some plans allow changes only during the employer's open enrollment period (usually once per year in Q4), while others allow mid-year changes. Check your plan.

If you get a raise, consider increasing your 401(k) contribution to capture the raise before you feel it in your take-home pay. This is the easiest way to boost retirement savings without feeling the financial impact.

Taking Money Out: Loans and Withdrawals

401(k) loans: You can borrow from your 401(k) balance (typically up to 50% of your balance or $50,000, whichever is less). You repay the loan with interest (typically the prime rate + 1–2%) back into your account. This is not a withdrawal, so you don't incur taxes or penalties. However, if you leave your job, the loan typically must be repaid immediately or it's treated as a withdrawal.

Early withdrawal (before 59½): You can withdraw from your 401(k) before age 59½, but you'll owe income tax plus a 10% penalty. Exceptions exist for hardship, disability, death, and substantially equal periodic payments (SEPP). These exceptions are narrow; don't plan on accessing your 401(k) early.

Withdrawal in retirement: After age 59½, you can withdraw without penalty. You'll owe income tax on the withdrawal. At age 73 (as of 2023 rule changes), you must begin taking Required Minimum Distributions (RMDs), or face a 25% penalty on the amount not withdrawn.

Employer Plan Withdrawal Timing

Next

Employer retirement plans like 401(k)s are the backbone of most retirement savings strategies, but they're not the only account type available. Traditional and Roth IRAs offer similar tax benefits with different rules, and understanding when to use each is critical for tax efficiency.

Related concepts

• Tracking Contributions and Limits