How much you contribute to a 403(b) is entirely your choice, within IRS limits

You decide how much of your paycheck goes into your 403(b), and your employer cannot force you to contribute any amount. The IRS sets a ceiling — the maximum you are allowed to put in during a calendar year — but there is no minimum. You can contribute 1% of your salary, 10%, or anywhere in between. You can also change your contribution amount whenever you want, usually by updating your payroll election through your employer's benefits system.

The practical limit depends on two things: what the IRS allows that year, and what your employer's plan permits. Most employers allow contributions up to the IRS limit, but some have their own rules. Your plan documents or benefits administrator can tell you what your specific employer allows.

Key Takeaways

  • The IRS limit for 403(b) contributions in 2024 is $23,500 per year if you are under 50, and $31,000 if you are 50 or older (the extra $7,500 is called a catch-up contribution).
  • You choose your contribution percentage or dollar amount, and you can change it at any time — usually during open enrollment or whenever your life circumstances shift.
  • Your contribution comes out of your gross pay before taxes are calculated, which lowers your taxable income for that year.
  • If you change employers, your old 403(b) stays where it is unless you move it; starting a new 403(b) at your new job does not affect the old one.
  • The IRS limit resets on January 1 each year, so if you hit the maximum in November, you cannot contribute again until the new year begins.

The IRS contribution limit changes yearly

The IRS announces the maximum 403(b) contribution amount each October for the following year. This limit applies to the total you contribute across all 403(b) plans you may have — you cannot split the limit between two employers to contribute more overall. The limit has increased most years since 2006, but the increase is not automatic; it depends on inflation adjustments the IRS calculates.

If you are 50 or older, you can contribute an additional amount called a catch-up contribution. This is a separate limit, so you get the full standard limit plus the catch-up amount on top. For example, if the standard limit is $23,500 and the catch-up is $7,500, a 50-year-old can contribute $31,000 total. The catch-up limit also changes yearly and is announced at the same time as the standard limit.

You can find the current year's limit on the IRS website or by asking your benefits administrator. If you are unsure whether you have hit the limit, your payroll department can tell you how much you have contributed so far in the calendar year.

How to decide what percentage to contribute

A common starting point is to contribute enough to get any employer match your plan offers. If your employer matches 3% of your salary, contributing at least 3% means you are not leaving information programs on the table. After that, the amount depends on your budget and retirement goals. Some people aim to save 10% to 15% of their income for retirement across all accounts; others contribute less if they have other savings or higher expenses now.

One practical approach is to start with a small percentage — say 3% or 5% — and increase it by 1% each year, or whenever you get a raise. This spreads the impact on your paycheck over time. You can also use online retirement calculators to estimate how much you might need to save, though these are rough guides and do not account for your specific situation.

Remember that money in a 403(b) is locked away until you are 59½ (with rare exceptions), so do not contribute so much that you cannot cover emergencies or other near-term needs from your regular paycheck.

What happens if you contribute more than the IRS limit

If you accidentally contribute more than the IRS allows in a single year, the excess amount and any earnings on it must be removed from your account. This is called a corrective distribution. Your plan administrator is responsible for catching this and fixing it, usually by April 15 of the following year. The excess contribution is taxed as ordinary income, and you may also owe a 6% excise tax on the overage.

This is rare if you have only one 403(b), because your payroll system is set up to stop contributions once you hit the limit. It is more common if you have multiple 403(b) plans with different employers in the same year — the IRS limit applies across all of them combined, and each employer's payroll system only knows about contributions to their own plan. If you change jobs mid-year, tell your new employer how much you have already contributed so they can adjust your new plan accordingly.

Changing your contribution amount during the year

You do not have to wait for open enrollment to change your 403(b) contribution. Most employers allow you to update your election whenever you want — after a major life event like a marriage, birth, or job change, or straightforward because your financial situation has shifted. Log into your employer's benefits portal or contact your benefits administrator to request a change. The new amount usually takes effect on your next paycheck, though some employers have a short processing delay.

If you are trying to catch up because you did not contribute enough earlier in the year, you can increase your percentage for the remaining paychecks. For example, if you are halfway through the year and have only contributed $5,000 but the annual limit is $23,500, you can increase your contribution rate so that the remaining paychecks add up to the full limit by December 31. Your payroll department can help you calculate the right percentage to hit your target.

How contributions affect your taxes

Money you contribute to a traditional 403(b) comes out of your gross pay before federal income tax is calculated. This means your taxable income for the year is lower, which can reduce the income tax you owe. For example, if you earn $50,000 and contribute $5,000 to your 403(b), you only pay income tax on $45,000. You still pay Social Security and Medicare taxes (FICA) on the full $50,000.

This tax benefit is one reason 403(b)s are popular — you reduce your tax bill in the year you contribute. However, when you withdraw money in retirement, those withdrawals are taxed as ordinary income. Some employers also offer Roth 403(b) contributions, where you contribute after-tax dollars but withdrawals in retirement are tax-free. The choice between traditional and Roth depends on whether you expect to be in a higher or lower tax bracket in retirement.

What to do if your employer does not offer a match

If your employer does not match contributions, you still benefit from the tax deferral and the ability to save for retirement through payroll. However, you are not getting an when ready return on your money the way you would with a match. In this case, the decision to contribute is purely about your own retirement savings goals and current budget. Some people prioritize other goals like paying off debt or building an emergency fund before maximizing 403(b) contributions.

If your employer's 403(b) plan has high fees or limited investment options, you might also consider whether other retirement savings vehicles — like an IRA — make sense for you. An IRA has lower contribution limits but often lower fees and more investment choices. You can contribute to both a 403(b) and an IRA in the same year, as long as you stay within each account's separate limits.

Frequently Asked Questions

Can I contribute to a 403(b) if I am part-time?

That depends on your employer's plan rules. Some plans allow part-time employees to contribute; others require a minimum number of hours per week or per year. Check your plan documents or ask your benefits administrator. If your employer does not offer a 403(b) to part-time staff, you can open an IRA on your own.

What if I want to contribute the maximum but I do not earn enough?

You can only contribute up to the amount you actually earn. If you make $20,000 a year, you cannot contribute $23,500 no matter what the IRS limit is. Contribute what you can afford, and increase it as your income grows.

Do I have to contribute the same amount every paycheck?

No. You can change your contribution amount whenever you want. Some people contribute more in months when they receive bonuses or less during expensive months. Just make sure your total for the year does not exceed the IRS limit.

If I leave my job, what happens to my 403(b) contributions?

Your 403(b) stays in the account at your old employer's plan unless you move it. You can leave it there, roll it into your new employer's 403(b) or 401(k), or roll it into an IRA. You cannot withdraw it without paying taxes and penalties unless you are 59½ or meet a narrow exception.

Can my employer force me to stop contributing?

No. Your employer cannot require you to contribute or prevent you from contributing up to the IRS limit. However, some plans have rules about when you can change your election — for example, only during open enrollment — so check your plan documents.