What Is a Missed Deferral Opportunity in a 401(k)?

A missed deferral opportunity is not the amount that should have come out of the employee's paycheck. It is the value assigned to the employee's lost chance to make 401(k) elective deferrals because the plan was operated incorrectly.

That distinction determines the correction.

Suppose an employee should have deferred:

$6,000

but payroll withheld nothing.

The employee's:

missed deferral = $6,000

The employer's corrective contribution for the:

missed deferral opportunity

might be:

• $3,000 under a traditional 50% method
• $1,500 under a qualifying 25% safe harbor
• $0 under a qualifying short-failure or Section 414(cc) method.

The employer can still owe missed matching or nonelective contributions and earnings.

So:

zero missed-deferral QNEC

does not mean:

zero correction.

Three Numbers Must Be Kept Separate

A clean correction starts by separating three concepts.

1. Missed deferral

The employee contribution that would have been made, or an estimated amount under the applicable correction method.

2. Missed deferral opportunity

The lost opportunity cost the employer may need to restore through a QNEC or other permitted corrective contribution.

3. Missed employer contribution

The match or nonelective contribution the employee would have received if the plan had operated correctly.

These numbers can be different.

Combining them into one column labeled:

401(k) shortage

is how correction errors begin.

What Creates a Missed Deferral Opportunity?

Common causes include:

• eligible employee excluded from enrollment
• employee entered the plan after the correct entry date
• payroll failed to implement a deferral election
• payroll used the wrong election percentage
• automatic enrollment failed
• automatic escalation failed
• rehire was treated as a new hire when immediate reentry was required
• employee was misclassified as an independent contractor
• plan compensation subject to deferral was understated
• merger or payroll conversion dropped an election
• payroll stopped deferrals without a valid participant election.

Different failures can produce the same symptom:

less money entered the 401(k) than the plan required.

The calculation method depends on why.

Fixing Payroll Today Does Not Fix Last Month

Assume an employee elected:

8%

on January 1.

Payroll mistakenly withheld:

0%

through June.

HR discovers the problem in July and turns on the correct 8%.

That stops the ongoing error.

It does not repair January through June.

The sponsor still needs to determine:

• missed compensation
• missed deferral
• missed deferral opportunity
• missed match
• missed nonelective contribution
• earnings
• testing effect
• applicable correction method.

Prospective operation and historical correction are separate tasks.

The Traditional EPCRS Baseline Is 50%

Revenue Procedure 2021-30 contains the longstanding correction framework for missed elective deferrals.^[3]

Under the traditional method, the missed deferral opportunity is generally:

50% of the missed deferral

with the corrective contribution adjusted for earnings.^[1][2][3]

The employer funds that lost-opportunity amount as a QNEC where required.

The employee does not retroactively surrender wages.

Example: Failed 6% Employee Election

Employee compensation during the failure:

$80,000

Employee elected:

6%

Missed deferral:

$80,000 × 6% = $4,800

Traditional missed-deferral-opportunity correction:

$4,800 × 50% = $2,400

Before earnings, employer QNEC:

$2,400

If the employee would also have received a:

50% match

on the missed $4,800, the missed match is:

$2,400

That missed match is a separate correction component.

Total employer principal before earnings:

$4,800

That consists of:

• $2,400 missed-deferral-opportunity QNEC
• $2,400 missed match.

The employer does not deposit $4,800 as the employee's retroactive elective deferral.

Why the Traditional Correction Is Not 100%

The correction principle is not:

replace the salary the employee would have chosen to defer.

The employee retained that salary in cash because payroll did not withhold it.

The lost economic benefit is the opportunity to invest that amount tax-advantaged in the plan.

EPCRS historically approximates that lost opportunity at 50% of the missed deferral under the standard method.^[3]

That is a correction convention.

It is not a claim that every employee would have earned exactly 50% of the missing contribution.

The Missed Deferral Depends on the Type of Failure

The correction percentage is only half the calculation.

First determine:

missed deferral

That amount can come from different inputs.

Failed Employee Election Uses the Employee's Actual Election

If an eligible employee submitted a valid election and the plan failed to implement it, Revenue Procedure 2021-30 generally determines the missed deferral from the employee's actual election.^[2][3]

If the election was:

7%

and the applicable compensation during the failure was:

$60,000

missed deferral:

$4,200

The plan should not replace that known election with the NHCE average.

The employee already told the plan what they intended to contribute.

Dollar Elections Use the Dollar Election

Suppose the employee elected:

$500 per month

Payroll failed for four months.

Missed deferral:

$2,000

subject to applicable plan and statutory limits.^[3]

Do not force a percentage calculation onto a fixed-dollar election.

Excluded Employee May Require an Estimated Deferral

An improperly excluded employee may never have had the chance to submit an election.

The plan therefore needs a reasonable rule for estimating what the employee would have deferred.

For a traditional 401(k), Revenue Procedure 2021-30 generally uses the actual deferral percentage of the employee's relevant group:

• HCE, or
• NHCE

for the year of exclusion under the specified correction method.^[1][3]

That is not a prediction of the employee's personal behavior.

It is the prescribed correction proxy.

Example: Excluded NHCE

Employee compensation during exclusion:

$50,000

NHCE ADP:

4%

Estimated missed deferral:

$50,000 × 4% = $2,000

Traditional 50% missed-deferral-opportunity QNEC:

$1,000

If the employee also would have received an employer contribution, that amount is calculated separately.

The Missed Deferral Cannot Ignore Section 402(g)

Revenue Procedure 2021-30 reduces a reconstructed missed deferral as needed so the employee is not treated as having missed more than the plan and Section 402(g) would have permitted.^[3]

Suppose an employee actually deferred:

$22,000

elsewhere under the employer's plan during 2026.

A correction cannot pretend the employee would also have made:

$10,000

of missed basic elective deferrals if that would exceed the applicable individual limit after coordinating the contributions.

The hypothetical correction cannot create a hypothetical illegal deferral.

Plan Limits Matter Too

A plan can impose limits below the statutory maximum.

If the document permits a maximum deferral of:

10% of compensation

the correction should not reconstruct a:

15%

missed deferral merely because a formula otherwise points there.

The plan failed to provide the opportunity the document promised.

It did not promise an opportunity the document prohibited.

Missed Match Is Usually Restored at 100%

This is the point most compressed explanations mishandle.

The missed-deferral-opportunity correction might be:

• 50%
• 25%
• zero.

That percentage does not normally reduce the employer match that would have been made.

IRS guidance requires correction of the employer contribution the participant lost because the deferral failure occurred.^[1][3][4]

If the employee would have received:

$2,000 match

the correction is generally built around restoring the:

$2,000

plus earnings.

Not:

• $1,000 because the QNEC percentage was 50%
• $500 because the QNEC percentage was 25%
• $0 because a zero-QNEC safe harbor applied.

The missed-deferral percentage belongs to the lost employee-deferral opportunity.

The match is a different obligation.

Zero-QNEC Does Not Mean Zero-Cost

Assume a qualifying correction method requires no QNEC for the missed deferral opportunity.

Employee missed deferral:

$5,000

Missed match:

$2,500

Required missed-deferral QNEC:

$0

Corrective match:

$2,500

Earnings on corrective match:

$300

Employer correction:

$2,800

A spreadsheet that sees:

QNEC = 0

and closes the case is wrong.

Missed Nonelective Contributions Are Separate Too

Some plans make employer contributions whether or not the employee defers.

Examples can include:

• safe-harbor nonelective contributions
• profit-sharing allocations
• top-heavy minimum contributions
• fixed employer nonelective contributions.

If an excluded employee should have received one of those allocations, the plan may need to restore:

100% of the missed employer contribution

plus applicable earnings under the correction method.^[1][3]

The missed deferral opportunity does not replace the employer allocation.

The 25% Safe Harbor Can Reduce the QNEC

Revenue Procedure 2021-30 provides a safe-harbor structure that can reduce the corrective QNEC from:

50%

to:

25% of the missed deferral

when the conditions are satisfied.^[1][3]

The IRS Fix-It Guide identifies conditions including:

• affected employee is still employed at correction under the applicable method
• correct deferrals begin by the specified deadline
• participant receives the required special notice within 45 days
• required corrective contributions are timely made.^[1]

The 25% number should never be applied by itself.

The safe harbor is a package.

Example: 25% Safe Harbor

Missed deferral:

$4,800

Qualifying 25% method:

$4,800 × 25% = $1,200

Missed match:

$2,400

Before earnings:

• QNEC: $1,200
• corrective match: $2,400
• total employer principal: $3,600.

Compare with the traditional 50% method:

• QNEC: $2,400
• corrective match: $2,400
• total employer principal: $4,800.

The safe harbor cuts the lost-opportunity component.

It does not cut the match.

Short Failures Can Produce a Zero QNEC

Revenue Procedure 2021-30 also contains a safe-harbor correction method under which certain short elective-deferral failures can require:

no QNEC for the missed deferral opportunity

when the failure is corrected promptly and all conditions are satisfied.^[1][3]

The IRS Fix-It Guide describes a less-than-three-month framework with:

• prompt commencement of correct deferrals
• required participant notice
• correction of other employer contributions.^[1]

Again:

no missed-deferral QNEC

does not mean:

no correction file.

Section 414(cc) Changed the Automatic-Contribution Landscape

SECURE 2.0 Section 350 added:

Internal Revenue Code Section 414(cc).^[4]

It creates a statutory correction safe harbor for specified reasonable administrative implementation errors.

When the requirements are met, the plan does not fail qualification solely because of the corrected error, and the employer is not required to replace the missed elective deferrals through a QNEC or otherwise.^[4]

That can reduce the missed-deferral-opportunity contribution to:

$0

while still requiring correction of missed matching contributions.

What Errors Can Section 414(cc) Cover?

Notice 2024-2 explains that Section 414(cc) addresses specified implementation errors involving:^[4]

• automatic enrollment
• automatic escalation
• implementation of an affirmative employee election for an employee covered by the automatic feature
• failure to give an eligible employee the opportunity to make an affirmative election because the employee was improperly excluded.

The provision is broader than:

"payroll forgot the automatic 3%."

Improper exclusion can also fall within the statutory framework when the conditions are met.

Section 414(cc) Is Not a Universal Error Eraser

The provision applies to qualifying:

reasonable administrative errors

within its defined implementation-error framework.^[4]

It does not mean every 401(k) failure can be corrected with:

zero QNEC + notice.

Examples that can require separate analysis include:

• wrong employer contribution formula unrelated to deferral implementation
• invalid plan document provision
• Section 415 excess
• improper distribution
• loan failure
• vesting failure
• unrelated ADP or ACP failure.

Start by classifying the error.

Do not start by choosing the cheapest correction.

The Section 414(cc) 9½-Month Rule

For an implementation error, Section 414(cc) generally requires correct elective deferrals to begin by the first payment of compensation made on or after the earlier of:^[4]

1. the last day of the 9½-month period after the end of the plan year in which the error first occurred, or
2. the employee-notification deadline described below.

For a calendar-year plan, 9½ months after December 31 is generally:

October 15

The actual correction date is tied to the first payroll payment on or after that date.

Example: Calendar-Year Section 414(cc) Error

Automatic-enrollment error begins:

January 1, 2026

Plan year ends:

December 31, 2026

9½-month date:

October 15, 2027

Assume first payroll payment on or after October 15 is:

October 16, 2027

If the employee has not notified the sponsor earlier, corrected elective deferrals generally must begin by that payroll date to satisfy this timing element.^[4]

That is much later than a three-month safe harbor.

But the statutory conditions still have to be met.

Employee Notice Can Accelerate the Deadline

Section 414(cc) does not let the sponsor wait until October 15 if the employee identifies the error earlier.

If the employee notifies the sponsor, the relevant deadline is tied to:

the first payment of compensation on or after the last day of the month following the month in which the employee notified the plan sponsor.^[4]

The rule uses the earlier deadline.

Example: Employee Reports the Error

Employee discovers missing deferrals and notifies HR:

March 10, 2026

End of following month:

April 30, 2026

Assume first payroll after April 30:

May 1, 2026

That employee-notification path arrives much earlier than the 9½-month-after-plan-year path.

Correct deferrals should begin by the applicable May payroll under the Section 414(cc) timing rule.^[4]

The sponsor cannot ignore the complaint and wait until the general outside date.

Section 414(cc) Requires a Participant Notice

Affected employees must receive the required notice within:

45 days after correct deferrals begin^[4]

under the statutory framework and Notice 2024-2 guidance.

The notice is not a courtesy email.

It is part of the correction method.

Notice 2024-2 generally directs sponsors to the safe-harbor notice structure in Revenue Procedure 2021-30 for current implementation.^[4]

The Notice Needs Substance

Under the referenced correction framework, the participant notice generally explains matters such as:

• the failure
• corrected deferrals
• corrective employer contribution information
• the participant's ability to change the deferral percentage going forward
• plan contact information.^[1][3][4]

A message saying:

"Your payroll deduction has been fixed"

may not satisfy the correction notice requirement.

Section 414(cc) Still Requires Corrective Match

SECURE 2.0 did not make the missed employer match disappear.

If the employee would have received additional matching contributions had the missed elective deferrals occurred, Section 414(cc) requires a corrective allocation of:

the missed matching contribution

adjusted for earnings.^[4]

This is the core trade-off.

The employer can avoid replacing the employee's missed elective deferrals.

It still has to restore the employer contribution the employee lost.

The Corrective-Match Deadline Has Its Own Rule

Notice 2024-2 says a corrective allocation of matching contributions under Section 414(cc) must be made within a:

reasonable period

after correct elective deferrals begin, or would have begun for a terminated employee.^[4]

The IRS gives a bright-line deemed-reasonable period:

by the last day of the sixth month following the month in which correct elective deferrals begin.^[4]

That deadline is different from the 45-day participant notice.

Keep the clocks separate.

Example: Corrective Match Deadline

Correct deferrals begin:

May 15, 2026

Month of correction:

May 2026

Sixth month following May:

November 2026

A corrective matching allocation made by:

November 30, 2026

is treated by Notice 2024-2 as made within a reasonable period.^[4]

The sponsor should not confuse this with:

• October 15 9½-month timing
• 45-day notice
• EPCRS correction periods.

Different steps.

Different clocks.

Section 414(cc) Can Cover Terminated Employees

This is an important change from some older correction safe harbors.

Notice 2024-2 states that Section 414(cc) can be used for a qualifying implementation error even when the affected employee has terminated employment before corrected deferrals would otherwise begin.^[4]

The sponsor still corrects the error.

The notice content is adjusted because a terminated employee obviously cannot be told that payroll deductions are now beginning or that they can increase future deferrals with that employer.^[4]

Termination does not automatically disqualify the statutory correction route.

The Older 25% Safe Harbor Can Treat Termination Differently

The IRS Fix-It Guide notes that certain Revenue Procedure 2021-30 reduced-QNEC safe harbors depend on the employee being currently employed when the relevant correction conditions are satisfied.^[1]

That means:

terminated employee

can produce a different result depending on which correction method is being used.

Do not carry an employment-status condition from one safe harbor into Section 414(cc) without checking the current rule.

Section 414(cc) Must Be Applied Nondiscriminatorily

The statutory correction must address similarly situated participants in a:

nondiscriminatory manner.^[4]

The sponsor cannot identify ten employees affected by the same implementation error and correct only the five whose restoration cost is lowest.

The correction method is not an employer-selection tool.

Corrective Earnings Matter

Under the traditional EPCRS framework, corrective QNECs and employer contributions are generally adjusted for earnings through the correction date under the applicable methodology.^[1][2][3]

Section 414(cc) also requires the missed matching contribution to be adjusted for earnings.^[4]

That reflects a simple economic fact:

the participant lost not only the contribution.

They also lost the opportunity for that contribution to participate in plan investment results.

Example: Earnings on a Missed Match

Missed matching contribution:

$2,000

Applicable earnings adjustment:

$240

Corrective match:

$2,240

If the missed-deferral QNEC is zero under Section 414(cc), the employer can still owe:

$2,240

The statutory zero applies to the employee-deferral replacement.

Not the employer match.

Safe-Harbor 401(k) Plans Need Their Own Missed-Deferral Formula

A safe-harbor 401(k) can require a different reconstructed missed deferral than a traditional ADP-tested plan.

Revenue Procedure 2021-30 includes specialized rules for excluded employees in safe-harbor designs.^[3]

For certain matching safe-harbor arrangements, the missed deferral can be based on the greater of:

• 3% of compensation, or
• the maximum deferral percentage that would have earned a matching rate of at least 100%

under the applicable correction provision.^[3]

The point is not the specific percentage in isolation.

It is that:

plan design changes the estimate.

Do not use the traditional NHCE ADP formula automatically in a safe-harbor plan.

QACA Errors Need QACA-Specific Analysis

A qualified automatic contribution arrangement, or QACA, has statutory automatic-deferral percentages and safe-harbor contribution rules.

Revenue Procedure 2021-30 contains specialized missed-deferral calculations for certain QACA exclusion failures.^[3]

SECURE 2.0 Section 414(cc) now adds a statutory correction layer for qualifying implementation errors.^[4]

The sponsor therefore needs to identify:

• plan type
• automatic contribution feature
• error date
• correction date
• employee notification
• matching formula
• current statutory safe harbor.

"Auto-enrollment error" is not enough information to calculate the correction.

Wrong Compensation Can Create a Missed Deferral Opportunity

Suppose the plan defines deferral compensation to include:

bonus

Employee elected:

10%

Payroll applies the election to salary only.

Bonus:

$20,000

Missed deferral:

$2,000

That can create a missed deferral opportunity even though the employee was never excluded from the plan.

INV-098 covers compensation definitions.

The correction analysis still asks:

• actual employee election
• compensation that should have been subject to the election
• applicable correction method
• missed match
• earnings.

Rehire Errors Can Create the Same Failure

An employee returns after a short break.

The plan requires immediate reentry.

HR mistakenly treats the employee as a new hire and imposes a six-month waiting period.

The employee loses six months of deferral opportunity.

The correction is not fundamentally a:

rehire correction.

It is an eligibility and deferral implementation failure created by a bad rehire decision.

INV-096 and INV-097 cover the service and entry-date mechanics.

INV-109 covers the contribution correction that follows.

Worker Misclassification Can Reach Back Multiple Years

Suppose an individual was treated as a 1099 contractor but should have been treated as a common-law employee.

If the worker satisfied 401(k) eligibility conditions, the plan may need to reconstruct:

• entry date
• compensation
• missed deferral
• missed deferral opportunity
• missed match
• profit sharing
• top-heavy contributions
• ADP/ACP testing
• earnings

for historical years.

INV-093 covers the worker-status issue.

Changing the person to W-2 today does not repair those years.

An Employee Who Would Have Chosen 0% Can Still Matter

Suppose an eligible employee was never invited to enroll.

The employee later says:

"I probably would not have contributed anyway."

That statement does not automatically erase the qualification failure.

The plan failed to provide the required election opportunity.

The correction method uses the applicable objective calculation rather than reconstructing compliance from hindsight conversations.^[1][3]

The employee can also affect testing population even if actual deferral would have been zero.

Section 415 Still Applies to Corrective Employer Contributions

Corrective QNECs and employer contributions enter the participant's account as employer allocations.

Section 415 annual-additions analysis can therefore matter.

For 2026, the ordinary Section 415(c) dollar ceiling is:

$72,000

subject to the 100%-of-compensation limit and the separate treatment of qualifying catch-up contributions.^[9]

A plan cannot fix one qualification failure by creating a Section 415 failure.

INV-099 covers the annual-additions calculation.

Correction Method Should Be Chosen After the Failure Is Measured

The correct order is:

1. determine who should have participated
2. determine when participation should have begun
3. identify the employee election or applicable proxy
4. calculate compensation during the failure
5. calculate missed deferral
6. calculate missed employer contributions
7. identify the available correction method
8. calculate corrective contribution percentages
9. calculate earnings
10. correct payroll prospectively
11. make historical corrective allocations
12. provide required notices
13. document the correction.

Starting with:

"Can we use the zero-QNEC rule?"

before measuring the failure invites bad analysis.

2026 EPCRS Needs a Current-Law Footnote

As of August 2026, the IRS's current public correction pages still identify:

Revenue Procedure 2021-30

as the operative EPCRS revenue procedure.^[6][8]

But the legal framework has changed around it.

SECURE 2.0 Section 305

Expanded self-correction.

Notice 2023-43

Provides interim guidance on the expanded self-correction rules before the EPCRS revenue procedure is formally updated.^[5][8]

SECURE 2.0 Section 350 / Section 414(cc)

Created a statutory safe harbor for specified elective-deferral implementation errors.^[4]

Notice 2024-2

Provides current IRS guidance for applying Section 414(cc).^[4]

That means an article that says simply:

"Rev. Proc. 2021-30 controls"

is incomplete in 2026.

The more accurate statement is:

Rev. Proc. 2021-30 remains the operative EPCRS revenue procedure, modified and supplemented by later statutory and IRS guidance.

Example: Traditional 50% Method

Employee:

• eligible throughout 2026
• elected 6%
• compensation during failure: $100,000
• payroll withheld 0%
• employer match: 50% of deferrals
• no reduced safe harbor applies.

Missed deferral:

$6,000

Missed-deferral-opportunity QNEC:

50% × $6,000 = $3,000

Missed match:

50% × $6,000 = $3,000

Employer corrective principal:

$6,000

Then add applicable earnings.

Example: Qualifying 25% Method

Use the same facts, but assume all conditions for the 25% safe harbor are satisfied.

Missed deferral:

$6,000

Missed-deferral-opportunity QNEC:

25% × $6,000 = $1,500

Missed match:

$3,000

Employer corrective principal:

$4,500

plus earnings.

The reduction is:

$1,500

not:

$3,000

because only the lost-opportunity component changed.

Example: Short Failure With Zero QNEC

Employee elected:

5%

Failure lasts:

two months

Missed compensation:

$20,000

Missed deferral:

$1,000

Assume the failure satisfies all conditions for the applicable short-failure zero-QNEC method.

Missed-deferral QNEC:

$0

Employer match that would have been earned:

$500

Corrective employer contribution:

$500 plus earnings

The failure still requires:

• payroll correction
• participant notice
• corrective match
• documentation.

Example: Section 414(cc) Automatic-Enrollment Failure

Calendar-year plan automatically enrolls employees at:

4%

Employee should have been enrolled January 1, 2026.

Payroll fails to enroll the employee.

The error is discovered in June 2026.

Assume:

• Section 414(cc) applies
• correct deferrals begin timely
• required notice is provided within 45 days
• similarly situated participants are corrected
• missed match is restored with earnings.

Missed elective deferrals are not replaced through a QNEC under the statutory safe harbor.^[4]

If missed match equals:

$1,200

and earnings equal:

$100

employer corrective contribution:

$1,300

The employee kept the missed take-home pay.

The employer restores the lost match and earnings.

Example: Employee Complaint Accelerates Section 414(cc)

Error begins:

January 2026

Employee notifies employer:

April 7, 2026

End of following month:

May 31, 2026

First payroll on or after May 31:

June 5, 2026

The Section 414(cc) correction timing is driven by the earlier employee-notification path, not the later 9½-month-after-plan-year date.^[4]

A sponsor that waits until 2027 because:

"we have 9½ months after year-end"

would misread the statute.

Example: Terminated Employee Under Section 414(cc)

Employee should have been automatically enrolled.

Employee terminates before the error is discovered.

Under Notice 2024-2, a qualifying Section 414(cc) correction can still be available.^[4]

The sponsor does not need to begin payroll deductions for a former employee.

But it still must handle:

• corrective matching contributions
• earnings
• required notice, with terminated-employee modifications
• nondiscriminatory correction.

This is materially different from older reduced-QNEC safe harbors that can require current employment.

The Correction File Should Show the Math

For each affected employee, keep:

A correction file that contains only:

"Employee missed $4,800; deposit $2,400"

does not show why $2,400 is correct.

Frequently Asked Questions

What is a missed deferral opportunity?

It is the lost opportunity to make elective 401(k) contributions because of a plan operational failure. IRS correction methods assign an employer corrective amount to that lost opportunity.^[1][3]

Is the missed deferral opportunity the same as the missed deferral?

No.

The missed deferral is the underlying employee contribution that would have been made or is reconstructed.

The missed deferral opportunity is the corrective employer contribution based on that amount.

Does the employer always contribute 50%?

No.

Fifty percent is the traditional EPCRS baseline. Qualifying safe-harbor and statutory methods can reduce the missed-deferral-opportunity contribution to 25% or zero.^[1][3][4]

When can the correction be 25%?

Revenue Procedure 2021-30 provides a reduced-QNEC safe harbor when its timing, employment, notice and correction conditions are satisfied.^[1][3]

Can the correction be zero?

Yes.

Certain short-duration failures can qualify for a zero missed-deferral QNEC under EPCRS, and Section 414(cc) provides a statutory zero-QNEC route for qualifying implementation errors.^[1][3][4]

Does zero QNEC mean no missed match?

No.

Missed matching contributions generally still must be restored under the applicable correction method, with earnings.^[1][4]

What is Section 414(cc)?

It is a Code provision added by SECURE 2.0 that provides a safe harbor for correction of specified reasonable administrative elective-deferral implementation errors when statutory conditions are met.^[4]

What is the 9½-month deadline?

Under Section 414(cc), correct deferrals generally must begin by the first payroll on or after the earlier of the last day of the 9½-month period after the plan year of the error or the employee-notification deadline.^[4]

What happens if the employee reports the error?

The notification can accelerate the correction deadline to the first payroll on or after the last day of the month following the month of notification.^[4]

Is a notice required?

Yes. Section 414(cc) requires the prescribed notice, and Notice 2024-2 generally applies a 45-day period after correct deferrals begin.^[4]

Can Section 414(cc) apply after the employee quits?

Yes. Notice 2024-2 expressly permits qualifying corrections for terminated employees and modifies the notice content accordingly.^[4]

How long does the employer have to restore the missed match under Section 414(cc)?

Notice 2024-2 requires correction within a reasonable period and treats a corrective matching allocation made by the last day of the sixth month following the month correct deferrals begin as timely for this purpose.^[4]

What if payroll ignored my specific election?

The missed deferral is generally based on the election you actually made, subject to plan and statutory limits.^[2][3]

What if I was excluded and never made an election?

The applicable correction method may estimate the missed deferral using a prescribed proxy, such as the employee group's ADP in a traditional plan.^[1][3]

Do corrective contributions receive earnings?

Generally yes. Corrective QNECs and missed employer contributions require earnings treatment under the applicable correction rules.^[1][2][3][4]

Does correcting payroll now solve the old failure?

No.

It stops the ongoing error.

The sponsor still needs to correct the historical missed period.

The ROIStreet Missed-Deferral Analysis

Use this sequence:

Why was the deferral missed? → when should participation or the election have begun? → what compensation was affected? → what was the missed deferral? → what employer contributions were also missed? → which correction authority applies? → 50%, 25% or zero missed-deferral QNEC? → earnings → Section 415 → correct payroll prospectively → make historical contributions → send required notice → document every date

The shortcut to avoid is:

"Missed deferral × 50%."

That formula can be right.

It can also be obsolete for the facts.

In 2026, the correct missed-deferral contribution depends as much on the type and timing of the error as on the amount the employee failed to defer.

Sources & References

1. Internal Revenue Service: 401(k) Plan Fix-It Guide — Eligible Employees Were Excluded — https://www.irs.gov/retirement-plans/401k-plan-fix-it-guide-eligible-employees-werent-given-the-opportunity-to-make-an-elective-deferral-election-excluding-eligible-employees
2. Internal Revenue Service: Fixing Common Plan Mistakes — Correcting a Failure to Effect Employee Deferral Elections — https://www.irs.gov/retirement-plans/fixing-common-plan-mistakes-correcting-a-failure-to-effect-employee-deferral-elections
3. Internal Revenue Service: Revenue Procedure 2021-30 — Employee Plans Compliance Resolution System — https://www.irs.gov/irb/2021-31_IRB
4. Internal Revenue Service: Notice 2024-2 — Miscellaneous Changes Under SECURE 2.0, Section I — https://www.irs.gov/irb/2024-02_IRB
5. Internal Revenue Service: Notice 2023-43 — Interim Guidance on Expanded Self-Correction — https://www.irs.gov/pub/irs-drop/n-23-43.pdf
6. Internal Revenue Service: Correcting Plan Errors — Fix Plan Errors — https://www.irs.gov/retirement-plans/correcting-plan-errors-fix-plan-errors
7. Internal Revenue Service: Steps to Self-Correct Retirement Plan Errors — https://www.irs.gov/retirement-plans/steps-to-self-correct-retirement-plan-errors
8. Internal Revenue Service: Internal Revenue Bulletin 2026-01 — https://www.irs.gov/irb/2026-01_IRB
9. Internal Revenue Service: 401(k) and Profit-Sharing Plan Contribution Limits — https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-401k-and-profit-sharing-plan-contribution-limits

Educational Disclaimer

ROIStreet publishes educational content about retirement-plan operation and correction. This article is not legal, tax, actuarial, fiduciary or plan-administration advice. Missed-deferral corrections depend on the written plan, employee eligibility, entry date, election history, compensation, automatic-enrollment design, matching formula, employee notification, correction timing, employment status, earnings, Section 415 limits and the current version of EPCRS and SECURE 2.0 guidance.

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