When You Can Change Your 401(k) Contribution Amount

You can change your 401(k) contribution at most times during the year, but the rules depend on whether your employer's plan allows it and what triggered the change

Most employers let you change how much you contribute to your 401(k) during the plan year, but not all do. Some plans lock in your contribution rate until the next open enrollment period — usually once a year in the fall or winter. Others allow changes any time. The key is that your employer sets the rules for their specific plan, so the first step is checking your plan documents or asking your HR or benefits department what their policy is.

Even if your plan allows mid-year changes, the IRS has rules about when you can make them. You can change your contribution amount whenever you want if you have a may have access to life event — marriage, divorce, birth of a child, loss of health insurance, or a significant change in income. Outside of those events, you can only change during open enrollment or if your plan specifically permits it year-round.

Key Takeaways

Your employer's plan document sets whether you can change contributions mid-year or only during open enrollment, so check with your HR department first.
A may have access to life event — such as marriage, divorce, birth of a child, or loss of other health coverage — lets you change your contribution outside of open enrollment.
If you want to increase contributions, you are limited by annual contribution limits set by the IRS, which change each year.
Decreasing your contribution can usually happen when ready, but increasing it may take a payroll cycle or two to take effect.

What counts as a may have access to life event

The IRS allows mid-year contribution changes if you experience a may have access to life event that materially affects your need for retirement savings or other benefits. The most common ones are marriage, divorce, birth or adoption of a child, and death of a spouse or dependent. You can also change contributions if you lose health insurance coverage, if your spouse loses a job, or if you have a significant change in income — either an increase or decrease.

Your employer may have a narrower list than the IRS allows, so check your plan documents. Some employers are more restrictive and only recognize certain events. When you report a life event to HR, they will tell you whether it qualifies under your plan and what documentation they need — usually a marriage certificate, birth certificate, divorce decree, or a letter from your former employer showing the date coverage ended.

How to request a change and when it takes effect

Contact your HR or benefits department to request a contribution change. They will give you a form to fill out — sometimes called a salary deferral election form or contribution change form — or direct you to an online portal where you can make the change yourself. If you are changing because of a life event, include documentation of that event with your request.

The timing of when the change takes effect depends on your payroll schedule and your employer's processing time. A decrease in contributions usually takes effect within one or two pay periods. An increase may take longer because your employer has to update payroll systems and may need to verify that the new amount does not exceed IRS limits. Ask HR for a specific date when the change will show up in your paychecks.

Annual contribution limits and how they affect mid-year changes

The IRS sets a maximum amount you can contribute to a 401(k) each year. For 2024, that limit is $23,500 for people under 50, and $31,000 for people 50 and older (the higher amount includes a catch-up contribution). These limits change most years. If you increase your contribution mid-year, you need to make sure you will not exceed the annual limit by the end of the year.

If you are close to the limit and want to increase contributions, calculate how many pay periods are left in the year and whether the new amount will push you over. Your payroll or benefits department can help with this math. If you do accidentally exceed the limit, your employer is required to return the excess to you, but this creates paperwork and tax complications, so it is better to plan ahead.

Open enrollment versus mid-year changes

Open enrollment is the designated time — usually once a year — when all employees can change their 401(k) contributions without needing a life event. This period typically lasts one to four weeks and is announced by your employer in advance. If your plan does not allow mid-year changes outside of life events, open enrollment is your only opportunity to adjust your contribution rate.

Some employers offer plans that allow changes at any time, with or without a life event. If yours does, you can increase or decrease contributions whenever you want. Check your plan documents or ask HR whether your plan is "open" (allows changes anytime) or "closed" (only during open enrollment or with a life event). Knowing this saves you from making a request that will be denied.

What happens if you want to stop contributing temporarily

You can suspend your 401(k) contributions at any time, even mid-year, without needing a life event. This is treated as a decrease to zero. Once you suspend, you can restart contributions during the next open enrollment period, or when ready if you have a may have access to life event, or when ready if your plan allows year-round changes.

Suspending contributions does not affect the money already in your account — it stays invested and continues to grow. You can still take loans from your 401(k) if your plan allows it, and you are still subject to the same withdrawal rules. Suspending is useful if you face a temporary cash flow problem but plan to resume saving later.

Frequently Asked Questions

Can I increase my 401(k) contribution if I get a raise?

A raise counts as a significant change in income, which is a may have access to life event in most plans. Contact HR with documentation of your new salary — usually a new offer letter or pay stub — and you should be able to increase your contribution when ready. If your plan does not recognize income changes as may have access to events, you will have to wait for open enrollment.

What if I change my contribution and then change my mind?

You can change it again, subject to the same rules. If you increased during open enrollment and want to decrease before the year ends, you can usually do so when ready. If you increased because of a life event and want to reverse it, contact HR — some plans allow this, others do not, depending on the specific event and your plan rules.

Will changing my contribution affect my employer match?

That depends on how your employer structures the match. Some employers match a percentage of what you contribute, so lowering your contribution also lowers the match. Others have a fixed match that does not change. Check your plan documents or ask HR how the match works under your plan before you decrease contributions.

Can I change my contribution if I am on leave from work?

Yes, you can request a change while on leave, but the timing of when it takes effect depends on your employer's policy and payroll system. Contact HR before you leave to request the change, and ask them to confirm the effective date. If you are on unpaid leave, contributions will pause anyway once your paychecks stop.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.