You can change your 401(k) contribution amount during open enrollment or after a may have access to life event

Most employers let you change how much you contribute to your 401(k) once a year during open enrollment, which typically happens in the fall. Outside of open enrollment, you can change your contribution amount only if you experience a may have access to life event — a significant change in your personal or financial situation that the IRS recognizes as a reason to adjust your retirement savings mid-year.

The specific timing and rules depend on your employer's plan. Some plans are more flexible than others, and some allow changes more frequently than once yearly. Your plan documents and the summary provided by your benefits administrator spell out exactly when changes are allowed.

Key Takeaways

  • Open enrollment typically occurs once per year, usually in the fall, and is the standard time to change your contribution amount without a may have access to reason.
  • may have access to life events include marriage, divorce, birth or adoption of a child, significant change in income, and loss of health coverage.
  • Changes made during open enrollment usually take effect on January 1 of the following year, not when ready.
  • Some employers offer more frequent change windows or allow changes at any time, so check your specific plan rules with your HR or benefits department.
  • You cannot change your contribution amount retroactively — changes explore only to paychecks going forward.

Open Enrollment: Your Annual Change Window

Open enrollment is the designated period when all employees can change their 401(k) contributions without needing a reason. This window usually lasts 30 to 60 days and most commonly runs from October through November, with changes taking effect January 1. During this time, you can increase your contribution, decrease it, or stop contributing altogether.

Your employer sets the exact dates for open enrollment and communicates them to employees through email, the benefits portal, or printed notices. If you miss the open enrollment window, you will not be able to change your contribution amount until the next year's open enrollment — unless a may have access to life event occurs.

may have access to Life Events That Allow Mid-Year Changes

The IRS recognizes certain life changes as reasons to adjust your 401(k) contributions outside of open enrollment. These include marriage, divorce, birth or adoption of a child, death of a spouse or dependent, significant change in your income (such as a raise, demotion, or job loss), loss of health insurance coverage, and substantial changes in your childcare costs.

Some plans also recognize changes in your spouse's employment status, changes in your dependent's school enrollment, or a significant change in the cost of your health insurance. The exact list varies by plan, so check with your benefits administrator about what counts as a may have access to event under your specific plan.

When a may have access to event occurs, you typically have 30 to 60 days to request a change. You will need to document the event — for example, a marriage certificate, birth certificate, divorce decree, or a notice of job loss. Your HR department can tell you what documentation they require.

How to Request a Change to Your Contributions

Most employers allow you to change your 401(k) contributions through an online benefits portal or by contacting your HR or benefits department directly. Log into your plan's website or app, find the contribution or payroll deduction section, and enter your new contribution amount or percentage. Some plans let you choose a dollar amount per paycheck; others ask for a percentage of your gross pay.

If you cannot access the portal or prefer to make the change in person, contact your HR department. They can walk you through the process and answer questions about how the change will affect your paycheck. Keep a record of when you submitted the change and what amount you requested — this protects you if there is a delay or error.

When Changes Take Effect

Changes requested during open enrollment typically take effect on January 1 of the following year. If you request a change after a may have access to life event, it usually takes effect on the next paycheck after your request is processed, though some plans have a one- or two-week delay. Ask your benefits administrator for the exact effective date when you submit your change request.

Changes are never retroactive. If you increase your contribution in March, the increase applies only to paychecks from March forward — you cannot go back and increase contributions from January and February. Similarly, if you decrease your contribution, the lower amount applies only to future paychecks.

Contribution Limits and What You Can Change

The IRS sets an annual limit on how much you can contribute to a 401(k). For 2024, that limit is $23,500 for people under age 50 and $31,000 for people age 50 and older (who can make catch-up contributions). Your employer may also set a lower limit or require that your contribution not exceed a certain percentage of your salary.

You can change the amount you contribute, but you cannot change the type of contribution (traditional versus Roth) outside of open enrollment unless your plan specifically allows it. Some plans do permit Roth election changes after may have access to events, so ask your benefits administrator if this applies to you.

What Happens If You Do Not Change Your Contribution

If you do not make a change during open enrollment, your contribution amount stays the same for the following year. Your contribution continues automatically unless you actively stop it. If you receive a raise, your contribution amount in dollars stays the same unless you increase it — meaning your contribution as a percentage of your pay goes down.

Some employers automatically increase contributions by a small percentage each year as part of a "auto-escalation" feature, but this is not standard. Check your plan documents or ask your benefits administrator whether your plan includes auto-escalation.

Frequently Asked Questions

Can I change my 401(k) contribution if I just got a raise?

A significant raise may count as a may have access to life event under your plan, which would allow a mid-year change. Contact your HR department to ask whether your raise qualifies. If it does not, you will need to wait for open enrollment. Even without a may have access to event, you can always increase your contribution during the next open enrollment period.

What if I need to stop contributing to my 401(k) right now?

You can request to stop contributions when ready after a may have access to life event such as job loss or a major drop in income. Outside of a may have access to event, you must wait for open enrollment. If you are in financial hardship, some plans allow loans or hardship withdrawals, though these have tax consequences — ask your benefits administrator about your options.

Does changing my contribution affect my employer match?

This depends on your plan. Some employers match a percentage of what you contribute, and lowering your contribution may lower your match. Others match a flat amount regardless of your contribution level. Review your plan documents or ask your benefits administrator how changes to your contribution affect your employer match.

Can I change my contribution more than once during open enrollment?

Yes. You can submit multiple change requests during open enrollment, and the most recent request will be the one that takes effect. There is no penalty for changing your mind multiple times before the open enrollment window closes.

What if my employer does not offer open enrollment?

Some smaller employers or plans may allow contribution changes at any time without waiting for open enrollment. Check your plan documents or ask your benefits administrator about the change windows available under your specific plan.