
Correcting missed 401k contributions can be a daunting task, but it's essential to catch up on lost savings. You can correct missed 401k contributions by filing Form 5329 with the IRS, which allows you to make a retroactive contribution.
The IRS requires you to file Form 5329 within three years of the original deadline. Missing this deadline can result in penalties and fines.
To avoid these penalties, it's crucial to act quickly and understand the rules surrounding missed contributions. The IRS considers a missed contribution to be any contribution that was not made on time, including those that were missed due to employer errors or system glitches.
You can also make a catch-up contribution to your 401k account, which is especially helpful if you're over 50 and want to boost your retirement savings.
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Understanding Deferrals
Deferrals are a crucial part of 401(k) plans, allowing participants to contribute a portion of their income to their retirement accounts on a tax-deferred basis. In order for deferrals to be processed correctly, elections must be implemented timely.
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There are three common scenarios that can lead to missed deferral opportunities: Implementation Error, Eligibility Error, and Compensation Error. Implementation Error occurs when an election is not implemented timely or at all, such as when an employee submits an election to contribute 5% of their pay to the 401(k) plan, but it is not processed.
Eligibility Error happens when an employee who has met the plan's eligibility requirements is not given the opportunity to make a deferral in a timely manner. For example, an employee may be first eligible for the plan on January 1, but is not given the opportunity to make 401(k) deferrals until April 1.
Compensation Error occurs when an incorrect definition of compensation is used to calculate a participant's deferrals. This can happen when plan provisions indicate that total compensation should be used, but deferrals are not calculated on bonus payments.
Here are some examples of how missed deferrals can occur and how to correct them:
In both cases, the corrections are only for the missed deferrals, and the corrective contributions must be adjusted for earnings on the missed deferrals.
How Deferrals Happen
Deferrals happen in various ways, but let's break down the most common scenarios. Implementation errors can lead to missed deferral opportunities, such as when an employee submits an election to contribute to the 401(k) plan but it's not implemented timely or at all.
An example of this is an employee who submits an election to have 5% of their pay deducted and contributed to the 401(k) plan beginning on April 1, but due to an oversight, that election is not implemented.
Eligibility errors can also cause deferrals to go awry. This occurs when an employee who has met the plan's eligibility requirements is not timely given the opportunity to make a deferral.
For instance, an employee may be first eligible for the plan on January 1 but is not given the opportunity to make 401(k) deferrals until April 1.
Compensation errors can also lead to deferrals being calculated incorrectly. This happens when an incorrect definition of compensation is used to calculate a participant's deferrals.
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Plan provisions might indicate that total compensation is to be used, but operationally deferrals are not calculated on bonus payments.
Here are the three most common scenarios that can lead to a missed deferral opportunity failure:
Avoid Deferrals
To avoid deferrals, it's essential to stay on top of deadlines and procedures. Determine why deferrals were missed in the first place.
Missed participant deferrals can be costly and time-consuming to correct. Click on the link for additional information about IRS correction programs and examples on how to correct issues with your plan.
Procedures can be put in place to prevent missed deferrals from happening again. This might include regular check-ins with the plan administrator or setting reminders for key deadlines.
By learning from past mistakes and implementing new procedures, you can reduce the risk of missed deferrals and stay compliant with regulations.
Correcting Deferrals
The IRS has a program called EPCRS that allows plan sponsors to voluntarily correct certain oversights in plan management, including missed deferral opportunities.
To correct a missed deferral, you need to determine the amount the participant would have deferred had the error not occurred, known as the Missed Deferral Opportunity (MDO).
The MDO is calculated by determining the plan compensation for the missed deferral, which is used to calculate the corrective Qualified Nonelective Contribution (QNEC).
The amount of the corrective QNEC is 50% of the MDO, but can be reduced depending on the amount of time that has elapsed between the initial missed deferral and the date the participant's deferral election is properly implemented.
Regardless of the rate of the corrective QNEC, the company must calculate any missed matching contribution using 100% of the missed deferral opportunity amount.
Here's a summary of the corrective process:
- Determine the MDO
- Calculate the corrective QNEC (50% of the MDO, or reduced based on time elapsed)
- Calculate any missed matching contribution (100% of the MDO)
- Adjust items 2 and 3 for investment gains
- Deposit the resulting amount into the participant's plan account
The corrective contributions must be adjusted for earnings on the missed deferrals, which are calculated from the date that the elected deferrals were to be made through the date of the corrective contribution.
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A notice must be provided within 45 days of the correct deferrals being withheld, including information about the failure and a statement that correct deferrals have begun, corrective contributions will be made (if applicable), and that the participant can increase their deferral percentage to make up for the missed deferrals (if applicable).
In some cases, a 50% QNEC may be required for participants who are excluded from making catch-up contributions, but this rule is rare and only applies if the plan sponsor does not have a special catch-up election.
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Identifying and Recording Errors
Identifying and Recording Errors is a crucial step in correcting missed 401(k) contributions.
To start, you'll need to check payroll records to compare the employee's 401(k) election against actual deductions for each affected pay period.
This involves gathering evidence, including the dates of missed deductions, the amounts involved, and any relevant communications or plan documents.
You should also confirm that your system matches the percentage or dollar amount the employee elected.
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Note down the details, as keeping a clear record of each issue will be essential if you need to prove compliance or correct plan data later.
Here are the key steps to follow:
- Check Payroll Records: Compare the employee’s 401(k) election against actual deductions for each affected pay period.
- Confirm Contribution Percentage: Make sure your system matches the percentage or dollar amount the employee elected.
- Gather Evidence: Note the dates of missed deductions, the amounts involved, and any relevant communications or plan documents.
Calculating and Depositing Contributions
The amount of the corrective Qualified Nonelective Contribution (QNEC) is 50% of the MDO, but this amount may be reduced depending on the time elapsed between the initial missed deferral and the date the participant's deferral election is properly implemented.
To calculate the corrective contribution, you need to determine the amount the participant would have deferred had the error not occurred, which is the missed deferral opportunity (MDO).
The missed matching contribution is calculated using 100% of the MDO, regardless of the rate of the corrective QNEC.
You should also calculate any employer matching contribution associated with the MDO, and adjust items for investment gains.
To deposit the corrective contributions, you should establish a procedure that requires elective deferrals to be deposited coincident with or after each payroll according to the plan document.
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If deferral deposits are late, keep a record of why those deposits were late and coordinate with your payroll provider and others who service your plan to determine the earliest date you can reasonably make deferral deposits.
Here's a step-by-step guide to calculating and depositing corrective contributions:
- Determine the MDO
- Calculate the corrective QNEC (50% of the MDO)
- Calculate the missed matching contribution (100% of the MDO)
- Adjust items for investment gains
- Deposit the resulting amount into the participant's plan account
Note that forfeitures cannot be used to fund QNECs, but can be used to fund match-related corrective contributions.
Correcting Missed Contributions
Correcting missed 401k contributions can be a complex process, but it's essential to ensure compliance with IRS regulations and maintain employee trust.
The IRS has a program called the Employee Plans Compliance Resolution System (EPCRS) that allows plan sponsors to voluntarily correct certain oversights in plan management, including missed deferral opportunities.
To correct a missed contribution, the plan sponsor must determine the amount the participant would have deferred had the error not occurred, known as the missed deferral opportunity (MDO). This amount is typically calculated by comparing the participant's election against actual deductions for each affected pay period.
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The plan sponsor must then calculate any employer Qualified Nonelective Contribution (QNEC) to compensate the participant for the MDO, which is 50% of the MDO, unless the amount of time that has elapsed between the initial missed deferral and the date the participant's deferral election is properly implemented reduces this amount.
A table to summarize the steps to correct a missed contribution:
The plan sponsor must also notify the employee about the pay periods involved, the amount missed, and how they plan to correct it, and provide a timeline for when the correction will appear on their paycheck or in the retirement plan.
Prevent Future Errors
Regular audits are key to catching discrepancies early, so conduct quarterly or monthly spot-checks of payroll against 401(k) elections.
Automated alerts can also help flag missing or unexpectedly low deductions, so consider setting up system triggers to notify you of any issues.
Training for payroll staff is crucial to ensure they know how to process 401(k) changes and recognize common errors.
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Clear employee guidance is also essential, so encourage employees to review each pay stub to confirm that 401(k) contributions are accurate.
If your team is stretched thin, consider outsourcing payroll to gain access to a dedicated team focused on keeping payroll accurate and compliant.
Here are some safeguards to implement:
- Regular Audits: Conduct quarterly or monthly spot-checks of payroll against 401(k) elections.
- Automated Alerts: Use system triggers that flag missing or unexpectedly low deductions.
- Training for Payroll Staff: Ensure your team knows how to process 401(k) changes and recognizes common errors.
- Clear Employee Guidance: Encourage employees to review each pay stub to confirm that 401(k) contributions are accurate.
Corrective Contribution
A corrective contribution is essentially a payment made to an employee's retirement plan to make up for missed contributions. This can include both employer matching contributions and nonelective contributions. The amount of the corrective contribution depends on the type of contribution that was missed.
The IRS requires that corrective contributions be made as soon as possible, but no later than the 15th business day of the following month. This is a strict deadline, and failure to meet it can result in a prohibited transaction between the plan and the employer.
To determine the amount of the corrective contribution, you'll need to calculate the principal contribution, which is the amount that should have been withheld from the employee's pay based on their election. You'll also need to calculate any employer matching contributions that would have applied if the deduction had been processed correctly.
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In addition to the principal contribution and employer matching, you'll also need to consider lost earnings on the missed contributions. This is typically calculated using a plan guideline or a Department of Labor-approved method, and it's essential to ensure that these calculations align with your plan's rate of return or average investment performance over the relevant timeframe.
To illustrate this, let's consider an example. Suppose an employee had a missed contribution of $1,000, and the plan's rate of return is 5%. The lost earnings on that missed contribution would be $50, which would need to be added to the principal contribution to determine the total corrective contribution.
Here's a summary of the steps involved in making a corrective contribution:
- Determine the principal contribution
- Calculate any employer matching contributions
- Calculate lost earnings on the missed contributions
- Add the principal contribution, employer matching, and lost earnings to determine the total corrective contribution
- Make the corrective contribution as soon as possible, but no later than the 15th business day of the following month
By following these steps, you can ensure that your employees receive the correct corrective contributions and that your plan remains compliant with IRS regulations.
Notify Employee, Explain Next Steps
Communication is key when correcting missed 401k contributions. You must provide a correction notice within 45 days of the correct deferrals being withheld.

The notice should include information about the failure, a statement that correct deferrals have begun, and that corrective contributions will be made (if applicable). You should also let the employee know they can increase their deferral percentage to make up for the missed deferrals (if applicable).
Share the Details: Inform the employee about the pay periods involved, the amount missed, and how you plan to correct it. This transparency helps build trust and confidence in your company's retirement plan administration.
Offer a Timeline: Let them know when the correction will appear on their paycheck or in the retirement plan. This gives the employee a clear understanding of when they can expect the correction to take effect.
Encourage Questions: Make yourself available to address concerns about compound interest, tax implications, or plan matching. This open communication helps alleviate any anxiety or uncertainty the employee may have.
A special rule in EPCRS requires 50% QNEC for participants who are excluded from making catch-up contributions. However, since Guideline has no special catch-up election, this rule should rarely, if ever, apply.
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IRS and Compliance
The IRS has a program to help correct oversights in 401k plan management, called the Employee Plans Compliance Resolution System (EPCRS). This program allows plan sponsors to voluntarily correct certain errors.
To correct missed deferral opportunities, you'll need to determine the amount the participant would have deferred had the error not occurred, known as the missed deferral opportunity (MDO). This is a crucial step in the correction process.
You'll then need to calculate an employer Qualified Nonelective Contribution (QNEC) to compensate the participant for the MDO. The amount of the QNEC is typically 50% of the MDO, but can be reduced depending on the amount of time that has elapsed between the initial missed deferral and the date the participant's deferral election is properly implemented.
In most cases, missed deferral opportunities can be self-corrected by the plan sponsor through EPCRS, and a formal submission to the IRS is not required. However, if the participant was automatically enrolled under a QACA and the auto-escalation was not applied timely, the MDO is the auto-escalation amount as determined by the plan document.
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If an eligible employee was not given an opportunity to defer, the amount of the MDO depends on the plan design. For non-safe harbor plans, the plan must use the average deferral percentage (ADP) for the year of exclusion, which is the average amount of deferral divided by total compensation.
Here's a summary of the steps to correct missed deferrals:
- Determine the MDO
- Calculate the QNEC
- Calculate any employer matching contribution associated with the MDO
- Adjust items 2 and 3 for investment gains
- Deposit the resulting amount into the participant's plan account
It's also important to provide a correction notice to the participant within 45 days of the correct deferrals being withheld. This notice must include information about the failure and a statement that correct deferrals have begun, corrective contributions will be made (if applicable), and that the participant can increase their deferral percentage to make up for the missed deferrals (if applicable).
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