A well‑run 401(k) plan depends on timely and accurate implementation of employee deferrals. When something goes wrong, such as when an election isn’t applied, a change isn’t processed, or an eligible employee is never offered enrollment, participants can lose the chance to contribute part of their pay into the plan. This is known as a missed deferral opportunity, and it is one of the most common operational errors cited by the IRS and DOL.

Understanding what causes a missed deferral opportunity, how to correct it properly, and what internal controls can prevent recurrence are essential for maintaining plan compliance and protecting participants.

What Is a Missed Deferral Opportunity?

A missed deferral opportunity occurs when an employee is not given the ability to make the elective deferrals they were entitled to under the 401(k) plan’s terms. Common examples include:

Failure to Implement an Employee’s Deferral Election
  • Payroll does not process a new or changed deferral percentage.
  • Benefit enrollment systems fail to transmit elections to payroll
Failure to Enroll an Eligible Employee
  • An employee meets eligibility criteria but is never notified or added to the plan.
  • An automatic enrollment feature is not applied when it should be.
Incorrect Application of Plan Provisions
  • Wrong eligibility service rules are applied.
  • Incorrect compensation is used for determining deferrals.
System or Administrative Issues
  • File-feed interruptions occur between HR Information Systems and payroll.
  • Auto-enrollment percentages do not default correctly.

Regardless of the cause, the impact is the same: The employee loses the chance to defer wages and potentially misses associated employer contributions.

How to Correct a Missed Deferral Opportunity

The IRS provides clear guidance under the Employee Plans Compliance Resolution System (EPCRS) on how to correct missed elective deferrals.

Step 1: Identify the Affected Period and Participants

Determine when the error began and ended, which pay periods are affected, and the  deferral percentage or dollar amount that should have been contributed.

Step 2: Calculate the Missed Deferral Amount

The IRS defines this as the participant’s missed opportunity, and it’s often expressed as the deferral rate the participant elected, or the default rate under auto-enrollment if no election existed.

Step 3: Apply Corrective Contributions

The correction approach depends on the type of plan, the nature of the failure, and how quickly it is identified and fixed. A special contribution known as a Qualified Nonelective Contribution (QNEC) may be required for missed deferrals.

For automatic enrollment plans, no QNEC is required if the failure does not extend beyond 9-1/2 months after the end of the plan year in which it first occurred, provided that correct deferrals begin by the earlier of (i) the first payday after that 9-1/2-month period or (ii) the first payday after the month following the participant’s notification of the issue. Despite not having to make a QNEC, the employer must still fund any missed matching contributions (adjusted for earnings). Also, they must provide affected participants with a notice within 45 days after correct deferrals begin.

For other non-automatic enrollment plans, a similar framework applies. If the failure is corrected within three months (and the employee is still employed) no QNEC is generally required, as long as deferrals begin within the required timing rules. Missed matching contributions must still be made and adjusted for earnings, and participants must receive timely notice.

If the failure extends beyond the deadlines mentioned above but is corrected within the applicable self-correction period (generally by the end of the third plan year following the year of the failure), a reduced QNEC of 25% of the missed deferral is typically required for active employees.

If correction occurs after that period, or if the affected participant is no longer employed in a non-automatic enrollment plan, a QNEC equal to 50% of the missed deferral is generally required. Again missed matching contributions adjusted for earnings must be deposited as well.

Step 4: Restore Lost Earnings

Earnings must be calculated from the date each contribution should have been made to the date it is actually deposited. This is typically based on the plan’s investment alternatives.

Step 5: Document and Retain Evidence

Good documentation is essential in the event of an IRS or DOL audit.

When applying corrections for missed deferral opportunities, it’s important to document the process.  In addition to an explanation of the error, plan sponsors should maintain a record of the calculations used to correct the error, the affected participants, the corrective steps taken, and the process improvements intended to prevent recurrence.

Operational Steps to Prevent a Missed Deferral Opportunity

A strong control environment is the best defense against missed deferral opportunities. Key practices should include:

Strengthen Payroll and HR Information System Integration
  • Automate deferral transmissions whenever possible.
  • Schedule data audits between systems to ensure accuracy.
Validate Deferral Changes Each Pay Period
  • Reconcile payroll deferrals with election files.
  • Create reports to flag zero deferrals for employees with active elections.
Monitor Eligibility Tracking
  • Automate eligibility calculations and notify HR when employees approach eligibility dates.
  • For auto‑enrollment plans, verify that all eligible employees are defaulted appropriately.
Conduct Regular Internal Audits
  • Consider regular reviews of deferral election files versus payroll data, the application of the Plan’s match formula, and eligibility determinations.
Train Payroll and HR Teams
  • Ensure teams understand plan terms and deadlines.
  • Keep documented procedures for processing elections and plan changes.
Maintain Robust Participant Communication
  • Confirm elections with employees via email or HR employee portal.
  • Provide clear timelines regarding when changes take effect

Conclusion

Missed deferral opportunities can lead to compliance headaches and costly corrections for plan sponsors. Fortunately, with early detection and proper correction through the IRS EPCRS guidelines, these issues can be resolved effectively. Even more importantly, strong operational policies and procedures can dramatically reduce the likelihood of errors occurring in the first place. For more information about missed deferral opportunities or corrective actions, contact your Blue Ridge Associates Retirement Plan Consultant.