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When Is A 401(k) Audit Required?

An annual 401(k) audit is an essential task for large and mid-sized businesses. Not every company is obligated to conduct an annual audit, but the United States government has set strict rules about which businesses do and don’t need one.

You should understand what the 401(k) audit requirements are so that you can follow the proper guidelines for your business.

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What Is a 401(k) Audit?

A 401(k) audit is a review of your company’s 401(k) plan by a third-party accounting firm to ensure that the plan is within the guidelines and regulations set by both the IRS and the Department of Labor. During the audit, the accountant will identify any errors in the plan, which provides an opportunity for you to correct the issues right away.

Not only is a 401(k) audit necessary to comply with the government’s regulations, but it also helps you offer a successful and effective retirement plan to your employees. Not all businesses need to undergo an annual 401(k) audit, though. The requirements for auditing are set by the Employee Retirement Income Security Act (ERISA).

When Do You Need a 401(k) Audit?

Your business is required to file Form 5500 by the end of the fiscal year. There are two versions of Form 5500. The long version is intended for large benefit plans, and the short version is intended for small plans. The correct form for your company depends on the number of employees you have who are eligible for the retirement plan.

Your 401(k) audit requirements also vary depending on the number of eligible participants. If your business has 100 or more eligible participants at the beginning of the plan year, you must undergo a 401(k) audit through a third party. The “keyword” in this situation is “eligible,” so even if some of your employees choose not to participate, they still count toward the audit requirement. With most businesses, employees are eligible for the 401(k) plan if they are age 21 or older and have at least one year of employment with the company. Your plan criteria may differ, though, so you should look into your plan’s specifics to determine how many eligible participants you have.

The number of eligible participants includes active employees and retired or separated employees who currently receive or can receive 401(k) benefits. It also includes deceased employees with beneficiaries who receive or are eligible to receive benefits.

Exceptions

There are two main exceptions to the standard rule of 100 eligible employees requiring an audit. During a partial plan year that lasts seven months or less, you can defer your audit to the following year. However, if the number of eligible participants drops below 100 the next year, you’ll have to conduct an audit for the partial plan year.

The other exception is known as the 80-120 rule. If the number of eligible employees is between 80 and 120, your audit requirement will stay the same as the previous year. For example, if you had 85 eligible participants in the first year and 115 in the second year, you will not need an audit for either year. This can continue indefinitely as long as the number of eligible participants stays under 120. When you have more than 120 eligible employees, you’ll always need an annual audit.

If you’re unsure whether your company needs a 401(k) audit, reach out to an accounting firm specializing in 401(k) audits for more information. There are penalties for missing an audit, so you should carefully check each year to determine whether or not you need one. A 401(k) auditing firm can help you clear up any confusion or uncertainty about your requirements. To make the process as effortless as possible, start reviewing your company’s 401(k) plan and eligible participants now.

Does a Fiscal-Year 401(k) Plan Still Need an Audit?

Potentially, yes.

Operating on a fiscal year does not eliminate or change the basic requirement for an independent employee benefit plan audit. Whether a defined contribution plan requires an audit generally depends on its Form 5500 filing status and the applicable participant-count rules—not whether its plan year ends December 31.

For defined contribution plans, the relevant participant count now focuses on participants and beneficiaries who have account balances at the beginning of the plan year, rather than everyone merely eligible to participate.

So an off-cycle plan sponsor should answer two separate questions:

Do we have an audit requirement?

And, if so:

When must that audit be completed so our Form 5500 can be filed on time?

Those are related questions, but they aren’t the same question.

When Should a Fiscal-Year 401(k) Audit Start?

The Form 5500 deadline should be the end of your audit timeline—not the beginning of it. The safest approach is to work backward from your actual filing deadline and establish the audit schedule well in advance.

If an independent audit is required, the auditor’s report generally accompanies the Form 5500 filing. That means the audit needs to be substantially complete before your filing deadline arrives.

There isn’t one audit-start date that works for every plan. The amount of time needed depends on factors such as plan size, the availability of records, the complexity of the plan and whether testing identifies issues requiring follow-up.

A practical timeline should allow time for:

Data collection: Your team may need to gather census information, payroll data, contribution records, recordkeeper reports, participant files and plan documents.

Audit testing: Your auditor will perform required procedures and may select participants or transactions for additional documentation.

Follow-up questions: Missing information and discrepancies often require responses from HR, payroll, the recordkeeper, TPA or other providers.

Resolving exceptions: Eligibility errors, contribution discrepancies, participant loans, distributions, compensation issues and other findings can require additional investigation.

Final review and issuance: The audit team still needs time to complete its review and issue the auditor’s report before the Form 5500 is finalized.

Example: A 401(k) Plan With a March 31 Year-End

Suppose your plan year ends March 31.

Your normal Form 5500 deadline is generally October 31.

With a timely Form 5558 extension, the deadline can generally be extended to January 15.

That does not mean January should become your target date for beginning the audit.

Instead, the plan sponsor and auditor should establish a timeline that leaves enough time before the applicable deadline to obtain records, complete testing and address any unexpected issues.

In other words:

March 31 plan year-end → October 31 normal deadline → January 15 extended deadline

Your audit calendar should be built backward from whichever filing deadline applies.

Example: A 401(k) Plan With a June 30 Year-End

A June 30 plan operates on a very different schedule.

Its Form 5500 would generally be due January 31 of the following year.

With a timely Form 5558 extension, the deadline would generally move to April 15.

For that employer, traditional summer 401(k) “audit season” may be largely irrelevant. Its audit preparation and testing may instead take place during the fall and winter.

That is why a plan with a non-calendar-year end should work with an auditor that maintains employee benefit plan audit capabilities throughout the year.

What Can Delay an Off-Cycle 401(k) Audit?

Having a different deadline doesn’t protect a plan from the same issues that slow down calendar-year audits.

Some common audit roadblocks include:

  • Missing or inaccurate census information
  • Eligibility and plan entry-date errors
  • Incorrect employer contribution or match calculations
  • Incorrect application of the plan’s compensation definition
  • Late participant contributions
  • Participant loan problems
  • Vesting or forfeiture discrepancies
  • Distribution documentation issues
  • Differences between payroll and recordkeeper data
  • Delays obtaining information from outside service providers

One of the advantages of starting early is having time to resolve those issues before they become filing-deadline problems.

What If Your Fiscal-Year Form 5500 Deadline Falls on a Weekend or Holiday?

There is an important exception to the dates in the chart.

If a Form 5500 filing deadline falls on a Saturday, Sunday or federal holiday, the filing can generally be made on the next day that is not a Saturday, Sunday or federal holiday. U.S. Department of Labor

That means sponsors should verify the precise deadline for the applicable filing year rather than relying solely on a recurring calendar.

The month-by-month chart is best used as a planning guide.

What About Short Plan Years?

A short plan year can occur when, for example, a plan changes its plan-year end or terminates and completes the distribution of plan assets.

The general Form 5500 timing rule still applies: the filing is generally due by the last day of the seventh calendar month after the short plan year ends, subject to an authorized extension. U.S. Department of Labor

Short plan years can introduce additional reporting and audit considerations, so sponsors should coordinate the filing timeline with their TPA, auditor and other advisors rather than assuming the normal annual schedule applies.

Don’t Build Your Audit Around October 15 If October 15 Isn’t Your Deadline

October 15 gets enormous attention in the 401(k) industry because it is the extended Form 5500 deadline for many calendar-year plans.

But it’s only one deadline.

For a non-calendar-year plan, your filing date could fall in January, April, June, November—or virtually any other month.

Your audit calendar should therefore begin with three questions:

When does our 401(k) plan year end?

When is our Form 5500 due?

When does the audit need to begin to comfortably meet that deadline?

Once those dates are established, your organization can build a recurring compliance calendar around its own plan rather than someone else’s audit season.

Looking for a 401(k) Auditor for a Fiscal-Year Plan?

PriceKubecka performs employee benefit plan audits throughout the year for both calendar-year and non-calendar-year 401(k) plans.

Our employee benefit plan specialists perform more than 400 EBP audits annually, including 401(k), 403(b) and ESOP audits. Because employee benefit plan auditing is a significant part of our audit practice, we can work with plan sponsors whose audit and Form 5500 deadlines fall throughout the year.

Whether your plan ends March 31, June 30, September 30 or another date, your audit should be built around your plan year and your deadline.

[Talk to a 401(k) Auditor]

Example: A 401(k) Plan With a March 31 Year-End

Suppose your plan year ends March 31. Your normal Form 5500 deadline is generally October 31.

With a timely Form 5558 extension, the deadline can generally be extended to January 15.

That does not mean January should become your target date for beginning the audit.

Instead, the plan sponsor and auditor should establish a timeline that leaves enough time before the applicable deadline to obtain records, complete testing and address any unexpected issues.

In other words:

March 31 plan year-end → October 31 normal deadline → January 15 extended deadline

Example: A 401(k) Plan With a June 30 Year-End

A June 30 plan operates on a very different schedule.

This plan’s Form 5500 would generally be due January 31 of the following year. With a timely Form 5558 extension, the deadline would generally move to April 15.

For that employer, traditional summer 401(k) “audit season” may be largely irrelevant. Its audit prep and testing may instead take place during the fall and winter.

That’s why a plan with a non-calendar-year end should work with an auditor that maintains EBP audit capabilities throughout the year.

In other words:

June 30 plan year-end → January 31 normal deadline → April 15 extended deadline

What Can Delay an Off-Cycle 401(k) Audit?

Having a different deadline doesn’t protect a plan from the same issues that slow down calendar-year audits. Some common audit roadblocks include:

  • Missing or inaccurate census information
  • Eligibility and plan entry-date errors
  • Incorrect employer contribution or match calculations
  • Incorrect application of the plan’s compensation definition
  • Late participant contributions
  • Participant loan problems
  • Vesting or forfeiture discrepancies
  • Distribution documentation issues
  • Differences between payroll and recordkeeper data
  • Delays obtaining information from outside service providers

One of the advantages of starting early is having time to resolve those issues before they become filing-deadline problems.

What If Your Fiscal-Year Form 5500 Deadline Falls on a Weekend or Holiday?

There is an important exception to the dates in the chart. If a Form 5500 filing deadline falls on a Saturday, Sunday or federal holiday, the filing can generally be made on the next day that is not a Saturday, Sunday, or federal holiday. 

That means sponsors should verify the precise deadline for the applicable filing year rather than relying solely on a recurring calendar. The month-by-month chart is best used as a planning guide.

What About Short Plan Years?

A short plan year can occur when, for example, a plan changes its plan-year end or terminates and completes the distribution of plan assets.

In this case, the general Form 5500 timing rule still applies: the filing is generally due by the last day of the seventh calendar month after the short plan year ends, subject to an authorized extension. 

Short plan years can introduce additional reporting and audit considerations, so sponsors should coordinate the filing timeline with their TPA, auditor, and other advisors rather than assuming the normal annual schedule applies.

Don’t Build Your Audit Around October 15 if it isn’t Your Deadline

October 15 gets enormous attention in the 401(k) industry because it is the extended Form 5500 deadline for many calendar-year plans. But it’s only one deadline.

For a non-calendar-year plan, your filing date could fall in January, April, June, November—or virtually any other month. Your audit calendar should therefore begin with three questions:

  1. When does our 401(k) plan year end?
  2. When is our Form 5500 due?
  3. When does the audit need to begin to comfortably meet that deadline?

Once those dates are established, your organization can build a recurring compliance calendar around its own plan rather than someone else’s audit season.

Looking for a 401(k) Auditor for a Fiscal-Year Plan?

PriceKubecka performs employee benefit plan audits throughout the year for both calendar-year and non-calendar-year 401(k) plans.

Our EBP specialists perform more than 400 audits annually, including 401(k), 403(b) and ESOP audits. Because employee benefit plan auditing is a significant part of our audit practice, we can work with plan sponsors whose audit and Form 5500 deadlines fall throughout the year.

Whether your plan ends March 31, June 30, September 30, or another date, your audit should be built around your plan year and your deadline.

[Talk to a 401(k) Auditor]

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