| 401(k) employee contribution limit (2024) | $23,000 (IRS, 2024) |
| Catch-up contribution limit for age 50+ (2024) | $7,500 additional (IRS, 2024) |
| Plans available to private-sector workers | 401(k) |
| Plans available to public school and nonprofit employees | 403(b) |
| Plans available to state and local government employees | 457(b) |
| Early withdrawal penalty age threshold | 59 1/2 (10% penalty applies before this age for 401(k) and 403(b)) (IRS rules) |
What employer-sponsored retirement plans are
An employer-sponsored retirement plan is a savings account your workplace sets up and administers on your behalf. Contributions come directly out of your paycheck before or after taxes, depending on the plan type, and the money grows in investments you choose from a menu the plan provides.
These plans are governed by federal law, which sets annual contribution limits, tax treatment rules, and withdrawal conditions. For a broader foundation on how retirement accounts work in general, see Retirement Accounts Explained.
| 401(k) employee contribution limit (2024) | $23,000 (IRS, 2024) |
| Catch-up contribution limit for age 50+ (2024) | $7,500 additional (IRS, 2024) |
| Plans available to private-sector workers | 401(k) |
| Plans available to public school and nonprofit employees | 403(b) |
| Plans available to state and local government employees | 457(b) |
| Early withdrawal penalty age threshold | 59 1/2 (10% penalty applies before this age for 401(k) and 403(b)) (IRS rules) |
The most common plan types
401(k)
A 401(k) is offered by private-sector employers. You elect a contribution percentage, and that amount is deducted from each paycheck. Traditional 401(k) contributions reduce your taxable income in the year you contribute; you pay income tax when you withdraw the money in retirement. Roth 401(k) contributions use after-tax dollars, so qualified withdrawals in retirement are tax-free.
403(b)
A 403(b) works almost identically to a 401(k) but is available only to employees of public schools, nonprofit organizations, and certain other tax-exempt entities. Contribution limits and tax treatment mirror those of the 401(k).
457(b)
State and local government employees, and some nonprofit workers, may have access to a 457(b) plan. One practical difference from a 401(k) or 403(b): withdrawals before age 59 1/2 are not subject to the standard 10% early-withdrawal penalty, though ordinary income tax still applies.
SIMPLE IRA and SEP-IRA
Smaller employers sometimes offer a SIMPLE IRA (Savings Incentive Match Plan for Employees) or a SEP-IRA (Simplified Employee Pension). Both have lower administrative costs than a 401(k). The SIMPLE IRA has lower contribution limits; the SEP-IRA allows higher employer contributions and is common for self-employed individuals.
Employer matching and why it matters
Many employers contribute money to your account when you contribute your own. A common structure is a dollar-for-dollar match up to a set percentage of your salary, for example 3% or 4%. If you do not contribute enough to capture the full match, you leave compensation on the table.
Matching contributions are subject to a vesting schedule. Vesting determines when the employer's contributions become fully yours. Some plans vest immediately; others use a graded schedule over several years or a cliff schedule where you become fully vested after a set period. Check your Summary Plan Description for the specific terms.
For a side-by-side comparison of workplace plans and individual retirement accounts, see 401(k) vs IRA.
Contribution limits and the tax advantage
The IRS sets annual limits on how much you can contribute to these plans. For 2024, the employee contribution limit for 401(k), 403(b), and most 457(b) plans is $23,000. Workers aged 50 and older can make an additional catch-up contribution of $7,500, bringing the total to $30,500. Employer contributions do not count against the employee limit but are subject to a separate combined limit.
The tax advantage compounds over time. When you contribute pre-tax dollars, the government is effectively delaying its share until retirement, which lets the full pre-tax amount grow in the interim. Roth contributions do not reduce your current tax bill, but the long-term growth is sheltered from future taxes entirely.
Understanding investment risk inside your plan is equally relevant. Different investment options, such as target-date funds versus individual stock funds, carry different risk profiles. See A Beginner's Complete Guide to Understanding Investment Risk for a plain-language overview.
Vesting schedule
The timeline that determines when employer contributions to your retirement account become permanently yours. Until you are fully vested, you may forfeit some or all employer contributions if you leave the job.
Employer match
A contribution your employer adds to your retirement account when you make your own contributions, typically up to a set percentage of your salary. It is part of your overall compensation.
Traditional (pre-tax) contribution
Money contributed to a retirement account before income taxes are applied. Your taxable income drops in the year of contribution, and you pay tax on withdrawals in retirement.
Roth contribution
Money contributed to a retirement account after income taxes have been paid. The account grows tax-free, and qualified withdrawals in retirement are not taxed.
Summary Plan Description
A document your employer is required to provide that explains all the rules of your workplace retirement plan, including eligibility, contribution limits, investment options, and vesting.
Catch-up contribution
An additional amount that workers aged 50 and older are permitted to contribute to a retirement plan each year, above the standard IRS annual limit.
What to do when you start a new job
When you begin a new position, your employer will provide enrollment materials, often during an onboarding window. Review the Summary Plan Description, which outlines all plan rules. Confirm the match formula, the vesting schedule, and the investment options available.
Set your contribution rate to at least capture the full employer match, then consider increasing it over time as your income grows. Designate a beneficiary on the account; this is a separate form from your will and controls who receives the balance if you pass away. If you have an old 401(k) from a previous employer, you may be able to roll it into the new plan or into an IRA.
The Early Retirement Planning Checklist covers these steps in detail if you want a structured walkthrough. For a broader starting point, Your First Retirement Plan explains how to sequence your early decisions.
This article provides general financial education and is not personalized investment, tax, or legal advice. Consult a qualified financial adviser, tax professional, or attorney for guidance tailored to your own circumstances.