How Much You Can Put Into Your 401(k) Each Year

The annual contribution limit for 2024 is $23,500 if you are under 50, and $30,500 if you are 50 or older

The Internal Revenue Service sets a ceiling on how much you can deposit into your 401(k) each calendar year. For 2024, that limit is $23,500 for workers under age 50. If you turn 50 at any point during the year, you can contribute an additional $7,500 as a catch-up contribution, bringing your total to $30,500.

These limits change most years. The IRS adjusts them in $500 increments when inflation crosses certain thresholds, so the number you see in 2024 will likely differ in 2025. Your plan administrator or payroll department will tell you the current year's limit when you enroll or update your contribution amount.

The limit applies to your contributions only — the money you choose to have withheld from your paycheck. It does not include employer matching contributions, profit-sharing deposits, or other money your company adds on your behalf. Those follow separate rules with higher ceilings.

Key Takeaways

• The 2024 contribution limit is $23,500 for workers under 50 and $30,500 for workers 50 and older, and these limits increase most years.
• Your employer's matching contributions and profit-sharing deposits do not count toward your personal limit, so you can receive additional money beyond the ceiling.
• If you change jobs mid-year, your contributions across all 401(k) plans must stay within the annual limit combined, not per plan.
• Exceeding the limit triggers taxes and penalties, so your payroll system is designed to stop contributions once you hit the ceiling.
• Catch-up contributions for workers 50 and older are separate from the main limit and do not reduce how much younger workers can save.

How the limit works across multiple employers

If you work for two employers in the same year and both offer 401(k) plans, your total contributions to both plans combined cannot exceed the annual limit. This is where many people run into trouble. You might contribute $15,000 to your first employer's plan, then move to a new job and contribute $12,000 to the second employer's plan. That is $27,000 total — over the $23,500 limit — and you will owe taxes and a 6% penalty on the excess.

Your payroll department at each employer does not know what you contributed elsewhere. They only track contributions to their own plan. So if you change jobs mid-year, you need to contact your old employer's plan administrator or your new one and report your prior contributions. Some plans have a form you fill out; others require a phone call. This step prevents the overage from happening in the first place.

If you do exceed the limit by accident, the plan administrator can return the excess to you before your tax filing deadline. This is called a corrective distribution. It removes the overage and the earnings on it, and you will owe income tax on the earnings portion but not the penalty if the correction happens in time.

Employer contributions do not count against your limit

Your employer can contribute money to your 401(k) on top of what you contribute yourself. Common forms include matching contributions (your company matches a percentage of what you put in) and profit-sharing (your company deposits a set amount or percentage for all employees). None of this counts toward your $23,500 annual limit.

The combined total of your contributions plus all employer contributions does have a ceiling — $69,000 for 2024 — but that is a separate rule and almost never affects individual workers. It mainly matters if your employer makes very large profit-sharing deposits or if you are a highly paid executive. Your payroll team monitors this combined total, not you.

This separation is why you should not skip contributing to your 401(k) just because you think you are saving enough. If your employer offers matching, that is assistance programs on top of your limit. A common match is 50 cents per dollar up to 6% of your salary. If you earn $60,000 and contribute 6%, your employer adds $1,800. That $1,800 does not reduce your $23,500 personal limit.

Catch-up contributions for workers 50 and older

The $7,500 catch-up contribution is available to anyone who reaches age 50 during the calendar year. You do not have to wait until your birthday to start using it — if you turn 50 on December 31, you can contribute the full catch-up amount for that year. The catch-up is an additional $7,500 on top of the base limit, not a replacement for it.

Some employers offer a separate catch-up plan or require you to enroll in catch-up contributions separately from your regular contributions. Check with your plan administrator or payroll department to confirm whether you need to take any action to use the catch-up amount. Many plans enroll you automatically once you reach 50, but not all.

The catch-up contribution is optional. You do not have to use it. If you are 50 or older but prefer to contribute less, you can stay at the base limit of $23,500 or any amount below it.

What happens if you exceed the limit

If you contribute more than the annual limit to a single 401(k) plan, your payroll system should stop accepting contributions once you hit the ceiling. Most employers have safeguards built in to prevent this. However, if the overage does happen — usually because you changed jobs and did not report your prior contributions — the consequences are real.

The excess amount is subject to income tax in the year you contributed it, and you owe an additional 6% excise tax on the overage each year it remains in the plan. If you contributed $25,000 when the limit was $23,500, that extra $2,500 gets taxed at your ordinary income rate plus 6%. If you do not correct it, the 6% tax applies again the following year, compounding the penalty.

The good news is that corrective distributions can undo this. If you catch the overage before you file your tax return for that year, you can request that the plan return the excess plus earnings. You pay income tax on the earnings but avoid the 6% penalty. After the tax filing deadline has passed, the penalty becomes harder to escape, so act quickly if you discover an overage.

How contributions are deducted from your paycheck

Your 401(k) contributions come out of your gross pay before federal income tax is calculated. This means if you earn $60,000 and contribute $10,000 to your 401(k), you only pay federal income tax on $50,000. This is called a pre-tax contribution, and it lowers your taxable income for the year.

Some plans also offer Roth 401(k) contributions, where the money comes out after tax. You do not get a tax deduction now, but withdrawals in retirement are tax-free. The annual limit of $23,500 applies to the combined total of pre-tax and Roth contributions — you cannot contribute $23,500 to each. If you put $15,000 into pre-tax and $8,500 into Roth, you have used your full $23,500 limit.

You can change your contribution amount whenever you want during the year. Most employers let you adjust it through their payroll portal or by submitting a form to human resources. Changes usually take effect on the next pay period. If you realize mid-year that you will not hit your target, you can increase your contribution. If you are on track to exceed the limit, you can decrease it.

Limits for self-employed people and solo 401(k) plans

If you are self-employed or own a business, you can set up a solo 401(k) (also called an individual 401(k)). The contribution rules are different. You can contribute as an employee (up to the same $23,500 limit) and also as an employer. Your total contribution as both employee and employer cannot exceed 25% of your net self-employment income or $69,000 for 2024, whichever is lower.

This higher ceiling is one reason solo 401(k) plans are popular with self-employed workers. If you earn $100,000 in net self-employment income, you might contribute $23,500 as an employee and an additional $18,750 as an employer, for a total of $42,250. A regular employee at a company cannot do this.

Solo 401(k) plans require more paperwork than employee plans. You need to set one up through a financial institution, file Form 5500 with the IRS if your plan balance exceeds $250,000, and keep records of your contributions. But the higher contribution ceiling makes the extra work worthwhile for many self-employed people.

Frequently Asked Questions

Can I contribute more if my employer does not offer matching?

No. The annual limit applies regardless of whether your employer matches or not. The limit is set by the IRS and applies to all 401(k) plans. However, if your employer does not offer matching, you might want to explore other retirement accounts like a traditional or Roth IRA, which have separate contribution limits and may offer tax benefits.

What if I max out my 401(k) before the end of the year?

Once you hit the limit, your payroll system stops withholding contributions for the rest of the year. You will see the full amount of your paycheck going forward. If your employer offers matching, confirm whether they continue matching after you max out, because some plans stop matching once you reach the limit.

Do I have to report my 401(k) contributions on my tax return?

Your employer reports your pre-tax 401(k) contributions on your W-2 form in Box 12. You do not need to list them separately on your tax return — the IRS already knows about them. Roth contributions are reported differently and do not reduce your taxable income, but they also do not require separate reporting on your return.

Can I carry over unused contribution room to next year?

No. The annual limit resets on January 1 each year. If you contribute $20,000 when the limit is $23,500, you cannot contribute the extra $3,500 in the following year. Each year stands alone. This is why some people increase their contributions late in the year if they realize they will not hit their target.

What if my income drops and I cannot afford to contribute the full limit?

You can contribute any amount up to the limit — there is no minimum. If you can only afford $5,000 this year, that is fine. You can increase contributions later if your income improves, or decrease them if money gets tight. Your plan likely lets you change your contribution amount as often as you need to.