What the contribution limit means for your 401(k)
The IRS sets a maximum amount you can put into your 401(k) each year. For 2024, that limit is $23,500 if you are under 50, and $31,000 if you are 50 or older (the extra $7,500 is called a catch-up contribution). These numbers change most years, so you will see them updated in January on the IRS website and in your plan documents.
The limit applies to what you contribute from your paycheck, not what your employer contributes. If your employer matches part of your contribution, that match does not count toward your personal limit. However, the combined total of your contributions plus your employer's contributions cannot exceed a separate, much higher limit (for 2024, that is $69,000 combined).
If you contribute more than the annual limit, the IRS will tax you twice on the excess — once when you earn it and again when you withdraw it. Your plan administrator is supposed to catch this and return the overage to you, but mistakes happen, so it is worth tracking your own contributions across all employers if you change jobs mid-year.
Key Takeaways
- The 2024 contribution limit is $23,500 per year if you are under 50, and $31,000 if you are 50 or older, and these limits change annually.
- Your employer's matching contribution does not count toward your personal limit, but the combined total of both contributions has its own separate ceiling.
- Contributing more than the limit triggers double taxation on the excess, so you should monitor your contributions if you work for multiple employers in one year.
- If you change jobs and roll over your old 401(k) to a new one, the rollover itself does not count against your annual contribution limit.
Why the IRS sets a limit at all
The contribution limit exists to prevent high earners from sheltering unlimited income from taxes. Without a cap, someone making $500,000 a year could put most of it into a 401(k) and pay almost no federal income tax. The limit keeps the tax system fair by ensuring that even people with large incomes pay tax on a meaningful portion of their earnings.
The limit also protects the retirement savings system itself. If there were no cap, wealthy people would accumulate enormous tax-deferred balances, and the government would eventually face a massive tax bill when those people retired and began withdrawing. The limit spreads the tax impact more evenly across the population and across time.
What happens if you hit the limit mid-year
If you are on track to exceed the limit before December 31, you should contact your plan administrator or payroll department and ask them to stop withholding contributions for the rest of the year. Most plans allow you to do this, and it prevents the overage problem entirely.
If you do not catch it and you over-contribute, your plan should automatically return the excess to you, usually by April 15 of the following year. The returned amount is taxed as ordinary income for the year you earned it. Any earnings on that excess are also returned to you and taxed, which is why over-contributing is costly — you lose the tax deferral benefit on that money.
If your plan does not catch the error and return the excess, you will owe taxes on it twice when you file your return. This is rare but does happen, especially if you work for two employers in the same year and neither knows about the other's contributions. The IRS Form 1040 instructions include a line for reporting excess contributions, and you can claim a deduction for the taxes you paid on the overage.
How the limit changes year to year
The IRS adjusts the contribution limit every year based on inflation. The adjustment happens in $500 increments, so the limit does not change every single year — it only moves when inflation has pushed it up enough to cross the next $500 threshold. In recent years, the limit has increased roughly every two to three years.
Your plan administrator is required to notify you of any change by December 31 of the year before it takes effect. You will usually see this in a summary document or an email from your HR or benefits department. If you do not hear anything by mid-December, it is safe to assume the limit has not changed from the previous year.
Contribution limits if you have multiple jobs
The annual limit applies across all your 401(k) plans combined, not per employer. If you work two jobs and both offer a 401(k), your total contributions to both plans cannot exceed $23,500 (or $31,000 if you are 50+). This is a common trap for people who change jobs mid-year or who work a second job.
If you over-contribute across multiple plans, you are responsible for catching it and asking one or both plans to return the excess. The plans do not automatically coordinate with each other. You will need to contact each plan administrator, tell them your total contributions across all plans, and ask them to return the overage. Do this as soon as you realize the problem — the longer you wait, the more complicated the tax situation becomes.
Catch-up contributions if you are 50 or older
If you turn 50 at any point during the calendar year, you become may be able to access for catch-up contributions for that entire year. The catch-up amount for 2024 is $7,500, bringing your total limit to $31,000. You do not have to wait until your birthday to start contributing at the higher rate — you can contribute the full $31,000 in the year you turn 50.
Catch-up contributions are optional. If you do not want to contribute the extra $7,500, you do not have to. Your plan administrator should automatically update your contribution limit in their system once you turn 50, but it is worth double-checking with HR or your benefits department to make sure the change has been made.
How rollovers and transfers affect your limit
Rolling over money from an old 401(k) to a new one, or from a 401(k) to a traditional IRA, does not count toward your annual contribution limit. A rollover is a one-time transfer of money you have already saved, not a new contribution from your paycheck. You can roll over any amount without affecting how much you can contribute going forward.
The same is true for transfers between plans. If your employer changes 401(k) providers and your balance is transferred to a new plan, that transfer does not count against your limit. Only contributions you make from your current income count toward the annual ceiling.
Frequently Asked Questions
Can I contribute more if my employer does not offer a match?
No. The annual limit applies regardless of whether your employer matches your contributions. The limit is set by the IRS and applies to all 401(k) plans the same way. If you want to save more for retirement, you can open a traditional or Roth IRA in addition to your 401(k), though IRAs have their own separate contribution limits.
What if I change jobs in the middle of the year?
Your contribution limit follows you. If you contributed $10,000 to your old employer's 401(k) before you left, you can only contribute $13,500 more to your new employer's 401(k) for the rest of that year (assuming the 2024 limit of $23,500). Contact your new plan administrator and let them know your prior contributions so they can set your limit correctly.
Do Roth 401(k) contributions count toward the same limit?
Yes. If your plan offers both a traditional 401(k) and a Roth 401(k), your combined contributions to both cannot exceed the annual limit. If you contribute $15,000 to the traditional side, you can only contribute $8,500 to the Roth side (for 2024). The limit is per person, not per account type.
What if my plan says I can contribute more than the IRS limit?
Your plan cannot override the IRS limit. If your plan documents say something different, that is an error in the plan documents, and the IRS limit is what actually applies. Contact your plan administrator and ask them to clarify. Do not contribute more than the IRS limit based on what your plan says — the IRS will not recognize the excess as a valid contribution.
Can I get the money back if I over-contributed?
Yes, but only the excess amount. Your plan should return the overage plus any earnings on it to you, usually by April 15 of the following year. The returned amount is taxable income for the year you earned it. If your plan does not return it automatically, contact your plan administrator and request the return in writing.