IRC 402(g) Elective Deferral Limit: Employer Compliance Guide
A participant-level 402(g) control should aggregate regular pre-tax and designated Roth elective deferrals, then reconcile payroll records to the recordkeeper b
A participant-level 402(g) control should aggregate regular pre-tax and designated Roth elective deferrals, then reconcile payroll records to the recordkeeper before year end.
IRC 402(g) Elective Deferral Limit: Employer Compliance Guide is best approached as an annual administration process, not as a one-time spreadsheet exercise. Plan sponsors, HR teams, finance teams, payroll, and the TPA need a shared definition of the issue, a dated source file, and a clear escalation path. That discipline makes results easier to explain to participants and easier to reproduce when staff, systems, or vendors change.
At a glance
- Core question: What does the current plan document require?
- Focus: Use controlled source data for the correct plan year.
- Reading path: Define, compare, implement, then review.
Define the question before changing data
IRS guidance explains that elective deferrals include pre-tax salary reductions and designated Roth contributions, and that a participant aggregates deferrals across plans when determining an excess. [1] Start with the governing plan document and adoption agreement, then identify the relevant plan year, people, contribution sources, and system-of-record fields. A generic report label is not enough. The team should write down what the report measures, its cutoff date, and the owner who can confirm its contents.
Next, separate facts from assumptions. Facts include payroll transactions, employment dates, election records, plan provisions, and recordkeeper posting confirmations. Assumptions include whether a field is complete, whether a code has the same meaning after a system conversion, or whether a prior-year practice remains appropriate. Put assumptions on the exception log until they are resolved.
Compare evidence, not just totals
Compare the participant or employee population, amounts, dates, and source codes between HRIS, payroll, and recordkeeper files. Differences can be legitimate—for example, timing, off-cycle pay, reversals, new hires, rehires, transfers, or a data cutoff—but each material difference should have a recorded explanation. Do not overwrite a discrepancy simply to make totals match.
| Evidence | Question to ask | Control response |
|---|---|---|
| Plan document | Which terms apply? | Confirm governing language and amendments. |
| Payroll and HR data | Is the population and amount complete? | Reconcile to controlled extracts. |
| Recordkeeper output | Did transactions post as expected? | Investigate timing and coding differences. |
For this topic, the practical objective is a defensible file: a new reviewer should be able to see what was reviewed, who made each decision, and which source supported it. This article is educational; it does not replace plan-specific legal, tax, investment, actuarial, or compliance advice.
Implement a repeatable workflow
Name a process owner and a backup, freeze a dated source extract, and retain a copy before manual edits. Use a field dictionary that maps every delivered column to its source system and describes its plan-administration meaning. Send targeted questions to payroll, HR, corporate records, or the TPA rather than asking one person to infer facts outside that person’s system.
Decision flow
- Identify rule: identify the governing limit, date, and affected group.
- Model impact: model cost, eligibility, and interaction with other rules.
- Apply control: apply the rule through payroll or plan controls.
- Recheck: recheck inputs, corrections, and retained support.
Define ➔ compare ➔ implement ➔ review. Escalate incomplete or contradictory facts before finalizing a correction or test result.
Maintain an exception log with the issue, affected people, source evidence, assigned owner, decision date, and final disposition. That log is more valuable than an informal email chain because it distinguishes open questions from approved outcomes. For recurring work, turn repeated exceptions into preventive controls—such as a required payroll code, a validation rule, or a report that runs before a deadline.
Practical review table
| Step | Practical output | Review question |
|---|---|---|
| Prepare | Dated data extract and plan terms | Is the period and population correct? |
| Validate | Exception log and source support | Does every material variance have an owner? |
| Act | Approved instruction or correction request | Does the action follow the document and provider process? |
| Retain | Workpapers and confirmations | Could a new reviewer reproduce the conclusion? |
Review and escalate
Review the completed work with the people responsible for payroll, HR data, plan administration, and vendor coordination. Confirm that late adjustments, terminated employees, corrected pay, and provider timing have been considered. If facts are incomplete, the right response may be to pause and obtain plan-specific guidance rather than to force a result.
IRS guidance emphasizes operation in accordance with plan terms and notes that changes in personnel, procedures, payroll systems, or service providers merit special scrutiny. [1] A quarterly control review can identify such changes before the annual testing or correction window becomes urgent. Preserve the review record and update the next cycle’s checklist when a gap is found.
Before closing the file, compare the final version to the original extract and note every approved change. Confirm that instructions sent to a provider match the approved conclusion, then obtain processing confirmation where an action was requested. This final read-back step creates a useful handoff for the next reviewer and helps prevent the same issue from becoming a recurring annual exception.
Make the control sustainable
A sustainable control has a documented cadence, a named owner, an alternate owner, and a trigger for review. Put the work on the annual calendar early enough that the team can investigate exceptions before a filing, testing, payroll, or correction deadline. When payroll, HRIS, recordkeeper, or corporate-structure changes occur, revisit the field dictionary, report logic, access controls, and contacts rather than assuming that a familiar export has the same meaning.
Use a brief review meeting to distinguish a completed task from a verified result. The owner should summarize the source files used, the population reviewed, exceptions found, decisions made, and remaining risks. The reviewer should challenge unexplained differences and confirm that all approved instructions were transmitted through the proper channel. Retain a final PDF or secured copy of the workpapers with dates and version identifiers. This creates continuity for future administrators and gives auditors or advisers a clearer factual record.
Finally, measure the process itself. Track recurring exception types, late data, manual overrides, and the time required to resolve issues. A pattern may reveal a configuration, training, or handoff problem that can be fixed upstream. Improving the input process is often more effective than repeatedly repairing downstream testing or correction results.
Takeaway
Reliable annual administration comes from controlled inputs, documented comparisons, and timely escalation—not from a single end-of-year report.
Editorial disclaimer: This material is for general education only and is not legal, tax, investment, actuarial, or compliance advice. Consult qualified advisers and the governing plan documents for a fact-specific decision.
References
- [1] Internal Revenue Service. https://www.irs.gov/retirement-plans/consequences-to-a-participant-who-makes-excess-deferrals-to-a-401k-plan