401k Fund Change Notice Requirements: Timing, Delivery, and Penalties

When a 401(k) plan swaps out or drops an investment option, federal rules require the plan administrator to send every affected participant a written notice at least 30 days, but no more than 90 days, before the change takes effect. These 401(k) fund change notice requirements come from the Department of Labor’s participant disclosure rule at 29 CFR § 2550.404a-5, and they govern the timing, the content, and how the notice reaches you.¹

The 30-to-90-Day Window

The rule sets both a floor and a ceiling. Notice must arrive at least 30 days before the effective date, so participants have time to react. It can’t arrive more than 90 days out either, so the information isn’t stale by the time the swap actually happens.¹

There is one narrow exception. If something genuinely unforeseeable makes advance notice impossible, the plan must send notice as soon as reasonably practicable after learning of the change. That fallback isn’t a convenience option; it exists for events outside the administrator’s control.

What the Notice Must Tell You

A compliant notice does more than announce that a fund is going away. For any investment that doesn’t pay a fixed rate of return, the notice must give you comparable, side-by-side detail on both the outgoing and incoming fund:²

The fund’s name and investment category, such as large-cap stock, balanced, or money market.
Average annual total returns for 1-year, 5-year, and 10-year periods through the most recent calendar year, with a reminder that past performance doesn’t guarantee future results.
Returns over the same periods for a broad-based securities market index, so you can compare the fund against the wider market.
Total annual operating expenses, stated both as a percentage of assets and as a dollar amount per $1,000 invested.
Any shareholder-type fees, including charges for purchases, transfers, redemptions, or short-term trading.

The notice must also state that fees are only one factor in choosing investments and warn that the cumulative effect of fees can substantially reduce account growth over time.¹

Where Your Money Goes if You Do Nothing

When a fund is dropped, the notice has to explain what happens to balances still sitting in that fund on the effective date. This is called mapping: the plan identifies a replacement fund that will automatically receive the balance from the discontinued option. The notice must describe the mapping clearly enough that you can tell where your money will land by default.

You are not stuck with the mapped fund. Participants can always redirect their balance to any other option on the plan’s menu, and the notice must include instructions for doing so along with the deadline for making that election. Read that deadline carefully. Most people who end up in an unsuitable fund after a lineup change didn’t get there because the replacement was bad; they got there because they never opened the envelope.

The fiduciary choosing the replacement fund has to meet ERISA’s prudence standard, which requires the care, skill, and diligence of a knowledgeable professional acting in a similar situation.³

Blackout Period Notices

Moving assets from one fund to another often requires a temporary freeze on transactions. When participants lose the ability to direct investments, take loans, or request distributions for more than three consecutive business days, that freeze is a “blackout period” under federal regulations and triggers its own separate notice.⁴

The blackout notice must go out at least 30 days before the freeze begins and must include:

The reason for the blackout, such as replacing investment funds or changing recordkeepers.
Which participant rights are being suspended, like directing investments or requesting distributions.
The expected start and end dates, or at minimum the calendar weeks the blackout will begin and end, along with a toll-free number or website where you can check the current status.
A statement telling you to evaluate whether your current investment allocations are appropriate, since you won’t be able to change them during the freeze.
The name, address, and phone number of the plan administrator or designated contact.

Default Investment Notices

If the change routes balances into a qualified default investment alternative, or QDIA, a separate QDIA notice applies. QDIAs are the investments a plan uses when a participant hasn’t given any instructions, and they typically include target-date funds, balanced funds, or managed accounts. The QDIA notice must be sent at least 30 days before assets are invested in the default option.⁵

It has to explain the circumstances under which the plan will invest on your behalf, describe the default investment’s objectives, risk characteristics, and fees, spell out your right to move money to a different fund at any time, and tell you where to find information about the plan’s other available investments.⁵

How the Notice Can Be Delivered

Paper mail to a participant’s last known address is the default. The Department of Labor’s electronic delivery safe harbor at 29 CFR § 2520.104b-1 permits digital delivery in two situations:⁶

Employees for whom accessing the employer’s electronic systems is an integral part of their job duties. Consent isn’t required.
Everyone else, only if they’ve affirmatively consented after being told what types of documents will be sent electronically, confirmed they can actually access them, been informed of their right to paper copies, and been given instructions for withdrawing consent.

The plan must take reasonable steps to confirm actual receipt, whether through delivery confirmations or by monitoring for bounced emails. You keep the right to request a paper copy no matter how the notice was originally delivered.⁶

Starting in 2026, new rules under SECURE 2.0 require paper benefit statements in certain situations. The DOL was still refining the updated electronic disclosure safe harbors as of early 2026, so the exact delivery requirements for a given notice may depend on when it goes out.

Who Has to Be Sent One

The rule covers every participant and beneficiary in the plan, not just active employees currently contributing.¹ Former employees who left their money in the plan, retirees drawing down their accounts, and beneficiaries of deceased participants who inherited an interest in plan assets all have to receive the notice. Alternate payees under a Qualified Domestic Relations Order have legal rights to a portion of a participant’s account and must also be kept informed of changes affecting those assets.⁷

If you’ve left a former employer’s plan money behind, keep your address current with that plan. Outdated contact information is one of the most common reasons participants miss these notices entirely.

Penalties for Getting It Wrong

For blackout period notices, ERISA § 502(c)(7) authorizes the Department of Labor to assess civil penalties of up to $169 per day for each failure to provide the required notice, an amount adjusted periodically for inflation.⁸ Multiplied across hundreds or thousands of affected participants, a single missed notice cycle can turn into a very large bill.

Plan fiduciaries also face personal liability for losses participants suffer because of inadequate disclosure. ERISA requires plan managers to act prudently and solely in the interest of participants and beneficiaries.⁹ A fiduciary who changes a plan’s investment lineup without proper notice hands affected participants a straightforward breach-of-duty claim. The Department of Labor can open its own investigation, and participants can sue under ERISA § 502(a) to recover losses to their individual accounts.

If you’ve received a fund change notice, mark the effective date, read what your money will be mapped into, and check the deadline for choosing a different option. If you think you should have received one and didn’t, ask the plan administrator in writing and keep the response.

1
eCFR. 29 CFR 2550.404a-5 – Fiduciary Requirements for Disclosure in Participant-Directed Individual Account Plans
2
eCFR. 29 CFR 2550.404a-5 – Fiduciary Requirements for Disclosure in Participant-Directed Individual Account Plans
3
Office of the Law Revision Counsel. 29 US Code 1104 – Fiduciary Duties
4
eCFR. 29 CFR 2520.101-3 – Notice of Blackout Periods Under Individual Account Plans
5
eCFR. 29 CFR 2550.404c-5 – Fiduciary Relief for Investments in Qualified Default Investment Alternatives
6
eCFR. 29 CFR 2520.104b-1 – Disclosure
7
U.S. Department of Labor. QDROs – Determining Qualified Status and Paying Benefits FAQs
8
U.S. Department of Labor. Fact Sheet – Adjusting ERISA Civil Monetary Penalties for Inflation
9
U.S. Department of Labor. FAQs About Retirement Plans and ERISA