401(k) Plan

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An employer-sponsored retirement plan allowing employees to make pre-tax or Roth (after-tax) salary deferrals, often with employer matching contributions. 2025 contribution limits are $23,500 (under age 50), with catch-up contributions of $7,500 (ages 50-59 and 64+) or $11,250 (ages 60-63, "super catch-up"). Employer matching contributions may be subject to vesting schedules. Plans may permit loans (generally up to $50,000 or 50% of vested balance) and hardship withdrawals. Required minimum distributions (RMDs) begin at age 73 for Traditional 401(k)s.

Example

A 45-year-old employee earning $90,000 annually contributes $10,000 to her 401(k) (11% of salary). Her employer matches 50% of contributions up to 6% of salary, adding $2,700 annually ($90,000 × 6% × 50% = $2,700). The employee contribution reduces her current taxable income to $80,000, and all contributions grow tax-deferred until retirement. She can contribute up to $23,500 annually to maximize tax-deferred growth.

Common Confusion

Students often confuse 401(k) contribution limits ($23,500/$31,000 for 2025) with IRA limits ($7,000/$8,000 for 2025). Another common error: assuming employer matching contributions count toward the employee contribution limit. They do not. The employee can still contribute $23,500 regardless of employer match. Vesting is also misunderstood: employee contributions are always 100% vested immediately, but employer match may have a vesting schedule (cliff or graded). Traditional 401(k) vs. Roth 401(k) confusion: Traditional uses pre-tax contributions (tax-deferred), while Roth uses after-tax contributions (tax-free qualified distributions). Finally, loan rules: the maximum loan is the LESSER of $50,000 or 50% of vested balance, not either/or.

How This Is Tested

  • Calculating employer matching contributions based on employee salary and company match formula
  • Determining maximum employee contribution limits including catch-up contributions for those age 50+
  • Comparing Traditional 401(k) (pre-tax contributions, tax-deferred growth, taxable distributions) versus Roth 401(k) (after-tax contributions, tax-free qualified distributions)
  • Understanding vesting schedules for employer matching contributions (cliff vs. graded vesting)
  • Identifying when RMDs must begin and calculating required distribution amounts
  • Evaluating 401(k) loan limits and repayment requirements
  • Distinguishing between employee deferrals (always 100% vested) and employer contributions (subject to vesting)

Regulatory Limits

Description Limit Notes
2025 employee contribution limit (under age 50) $23,500 annually Pre-tax and/or Roth contributions combined
2025 catch-up contribution (ages 50-59 and 64+) $7,500 annually Additional contribution above $23,500 base limit
2025 super catch-up contribution (ages 60-63) $11,250 annually Enhanced catch-up for ages 60-63 under SECURE 2.0
2025 total contribution limit (employee + employer) $70,000 annually Combined limit for employee deferrals, employer match, and profit sharing (excluding catch-up contributions)
RMD starting age Age 73 SECURE 2.0 Act; increases to age 75 in 2033
Maximum loan amount Lesser of $50,000 or 50% of vested balance Generally must be repaid within 5 years unless for primary residence purchase
Early withdrawal penalty 10% penalty Applies to distributions before age 59½ without qualifying exception
Vesting requirement (employee contributions) 100% immediate vesting Employee salary deferrals are always fully vested

Example Exam Questions

Test your understanding with these practice questions. Select an answer to see the explanation.

Question 1

Marcus, age 38, earns $120,000 annually and participates in his employer's 401(k) plan. The employer matches 100% of employee contributions up to 3% of salary, then 50% of contributions from 3% to 5% of salary. Marcus currently contributes 4% of his salary ($4,800 annually). He is considering increasing his contribution to maximize the employer match. How much should Marcus contribute to receive the full employer match, and what would the total employer contribution be?

Question 2

What is the maximum employee contribution limit for a 401(k) plan in 2025 for a participant who is 52 years old?

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Question 3

Jennifer, age 55, earns $180,000 annually and contributes the maximum employee contribution to her 401(k) plan. Her employer contributes a flat 3% of salary regardless of employee contributions (non-elective contribution). What is the total contribution to Jennifer's 401(k) for 2025 (employee plus employer)?

Question 4

All of the following statements about 401(k) plans are accurate EXCEPT

Question 5

An employee has participated in his employer's 401(k) plan for 3 years. He has contributed $60,000 total (employee deferrals), and his employer has contributed $18,000 in matching contributions. The employer uses a 6-year graded vesting schedule (20% per year). The employee's vested balance is $48,000. He is considering taking a 401(k) loan. Which of the following statements are accurate?

1. The employee's own $60,000 in contributions are 100% vested
2. The maximum loan amount he can take is $50,000
3. The maximum loan amount he can take is $24,000 (50% of vested balance)
4. If he leaves the company, any unvested employer contributions will be forfeited

💡 Memory Aid

Think "401(k) = Four-Oh-WIN" because you win in four ways: (1) Pre-tax contributions reduce current taxes, (2) Employer match is free money, (3) Tax-deferred growth compounds faster, (4) Higher limits than IRAs ($23K vs. $7.5K). Remember "Fifty Plus Seven-Five": Age 50+ gets $7,500 catch-up. For loans: "Half or Fifty" = lesser of 50% of vested balance OR $50,000.

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