How Much You Can Contribute to Your 401(k) Each Year

Your 401(k) contribution limit depends on your age and the year

The IRS sets an annual limit on how much you can put into your 401(k). For 2024, that limit is $23,500 if you are under age 50. If you are 50 or older, you can contribute an additional $7,500 per year, bringing your total to $31,000. These limits change most years, usually by $500 increments when inflation triggers an adjustment.

Your employer may also contribute to your account through matching or profit-sharing. Those employer contributions count toward a separate, higher limit — the total combined limit for 2024 is $69,000 per person (or $76,500 if you are 50 or older). This means your own contributions plus your employer's contributions cannot exceed that ceiling.

The limit that matters most to you is the one on your own paycheck deferrals. That is the $23,500 (or $31,000 with catch-up) figure. Your employer's contributions are their responsibility to track, not yours.

Key Takeaways

• You can defer up to $23,500 of your own salary into a 401(k) in 2024, or $31,000 if you are age 50 or older.
• Contribution limits are set by the IRS and typically increase by $500 every few years when inflation reaches a certain threshold.
• Your employer's matching or profit-sharing contributions count toward a separate, higher ceiling but do not reduce your personal contribution limit.
• If you change jobs mid-year, your contributions across all employers cannot exceed the annual limit, so you must track your total deferrals.

How the IRS calculates your limit each year

The IRS publishes new contribution limits in October or November for the following year. The limit increases only when the cost of living adjustment (COLA) reaches a threshold that rounds to the next $500 increment. In some years, there is no increase at all.

You can find the current year's limit on the IRS website under "401(k) contribution limit" or ask your plan administrator. Your employer's benefits team should also send you a notice at the start of each year showing the new limit. Do not rely on last year's number — always confirm the current year before you plan your contributions.

What happens if you contribute too much

If you exceed the limit, the excess amount is called an excess deferral. Your plan administrator should catch this and return the overage to you, usually by April 15 of the following year. The returned money is taxed as ordinary income in the year you contributed it, and you may owe taxes again on the earnings that money generated while it sat in the account.

Excess deferrals are most common when you change jobs mid-year and forget to tell your new employer how much you have already contributed elsewhere. If you worked for two employers in the same year, you must track your total deferrals across both plans. Your new employer's payroll system will not know what you put in at your old job.

Catch-up contributions if you are 50 or older

The catch-up contribution provision lets you add $7,500 more per year once you turn 50. This is a separate allowance designed to help people in their final working years save more for retirement. You do not need to ask permission — if your plan offers catch-up contributions and you are 50 or older, you can simply instruct your payroll to defer the higher amount.

Not all plans offer catch-up contributions, though most do. Check your plan documents or ask your benefits administrator whether your employer's 401(k) includes this feature. If it does not, you are limited to the standard $23,500 regardless of your age.

Employer contributions and the combined limit

Your employer may add money to your 401(k) through matching (typically 3 to 6 percent of your salary) or profit-sharing. These contributions do not count against your personal $23,500 limit. Instead, they count toward the combined limit — the total of all contributions from you and your employer in a single year.

For 2024, the combined limit is $69,000 (or $76,500 if you are 50 or older). In practice, this rarely affects most workers. You would need to earn a very high salary and have an employer contributing a large percentage for the combined limit to matter. Your plan administrator tracks this automatically and will stop accepting contributions if the combined total reaches the ceiling.

What to do if you are close to your limit

If you are nearing the annual limit mid-year, contact your payroll or benefits department and ask them to calculate your remaining room. They can tell you exactly how much more you can defer before hitting the ceiling. You can then adjust your paycheck deferral percentage for the remaining pay periods.

Some people front-load their contributions early in the year to take advantage of investment growth for longer. Others spread contributions evenly across all paychecks. Either approach is fine — the limit is the same regardless of when during the year you contribute. Just make sure your total does not exceed the annual maximum.

How limits differ for self-employed people and solo 401(k)s

If you are self-employed or own a small business, you may have a solo 401(k) (also called an individual 401(k)). The contribution rules are different because you wear two hats: employee and employer. You can defer up to $23,500 as the employee, and then contribute additional amounts as the employer, up to the combined limit of $69,000.

This structure lets self-employed people save significantly more than employees at larger companies. However, calculating your employer contribution requires knowing your net self-employment income after deducting half of your self-employment tax. Many solo 401(k) providers offer calculators to help with this. If you have questions, a tax professional or CPA can walk you through the math.

Frequently Asked Questions

Can I contribute more to my 401(k) if my employer does not offer matching?

No. Your personal contribution limit is the same whether your employer matches or not. The limit is set by the IRS and applies to all 401(k) plans. Employer matching is separate and does not increase your ability to defer your own salary.

What if I work for two employers in the same year?

Your total deferrals across both jobs cannot exceed $23,500 (or $31,000 if you are 50 or older). You must track your contributions at both employers and tell each one how much you have already deferred elsewhere. If you exceed the limit, the excess will be returned to you, usually by April 15 of the next year.

Do Roth 401(k) contributions count toward the same limit?

Yes. If your plan offers both a traditional and Roth 401(k), your combined deferrals to both cannot exceed $23,500 per year. You cannot put $23,500 in traditional and another $23,500 in Roth — the limit applies to the total of both.

Can I change my contribution limit mid-year?

Yes. You can increase or decrease your deferral percentage at any time through your payroll or benefits portal. Changes typically take effect on the next pay period. If you are approaching the annual limit, adjusting your deferral early enough gives you time to stay under the ceiling.

What if my plan does not allow catch-up contributions?

Most plans do offer catch-up contributions, but not all. If yours does not, you are limited to $23,500 regardless of age. Ask your benefits administrator whether your plan includes the catch-up feature. If it does not and you want to save more, you may be able to open an IRA or other retirement account outside your employer plan.