Written by Justin Goodman, CIC, CISC, CLCS, CEO and Co-Founder, Total CSR
Published: August 3, 2026 · Last reviewed: August 3, 2026
In plain language: 401(k) contributions are the part of an employee’s paycheck set aside to save for retirement, either through pre-tax contributions by the worker’s choice or as an employer match. For workers’ compensation purposes, these amounts are still counted as payroll even though the employee never receives them as cash.
Technical definition: 401(k) contributions are employee elective deferrals and employer matching amounts made to a qualified retirement plan under Internal Revenue Code Section 401(k). Under NCCI and most state workers’ compensation manuals, employee-elected deferrals (including designated roth contributions and pre-tax contributions) are included in remuneration for premium calculation; employer nonelective contributions and safe harbor contributions are typically excluded.
401(k) Contributions at a Glance
| Attribute | Detail |
|---|---|
| Also known as | 401k deferrals, employee contributions, salary reduction contributions, elective salary deferrals |
| Category | Payroll and remuneration definition |
| Lines of business | Workers’ Compensation, payroll-rated Commercial Auto and General Liability programs |
| Industries most affected | Construction, manufacturing, professional services, any payroll-heavy operation with business 401k plans |
| Related forms or endorsements | ACORD 130 Workers Compensation Application, state-specific payroll reporting worksheets |
| Who bears the risk | Employer, through inflated or understated premium if contributions are misclassified |
| Common solution | Accurate payroll records separating employee deferrals from employer match and tracking contribution limits |
| Also interacts with | Experience modification factor, gross compensation reporting, premium audit |
Key Takeaways
- 401(k) contributions are employee wages redirected into a retirement account, and most state workers’ compensation rules still count employee elective deferrals (including roth 401 and traditional pre-tax contributions) as payroll subject to premium.
- Getting this classification wrong during a payroll audit can produce a premium adjustment that surprises the client months after the policy period ends, especially when catch-up contributions or excess deferrals are involved.
- The most common misunderstanding is treating all retirement savings contributions the same way; employee deferrals and employer matching contributions (including safe harbor 401 contributions) are typically treated differently under NCCI rules.
- Agencies reduce audit disputes by advising clients to keep payroll registers that clearly separate gross compensation, employee 401(k) deferrals, and employer match contributions before the audit begins.
On This Page
- What Is 401(k) Contributions in Insurance?
- How Does 401(k) Contributions Work?
- Real Claim Examples Involving 401(k) Contributions
- 401(k) Contributions vs. Employer Matching Contributions: What Is the Difference?
- What Are the Most Common Mistakes With 401(k) Contributions?
- How to Explain 401(k) Contributions to a Client
- Frequently Asked Questions About 401(k) Contributions
- Related Insurance Terms
- Sources and References
- About the Author
What Is 401(k) Contributions in Insurance?
401(k) contributions are amounts an employee elects to defer from gross wages into a tax-advantaged retirement account, sometimes matched in whole or part by the employer. In insurance, the term matters almost entirely in the context of workers’ compensation premium audits, where the definition of remuneration determines how much payroll an insurer charges rates against. Because 401(k) deferrals—whether pre-tax contributions or designated roth contributions—are still earned wages the employee chose to redirect rather than receive as cash, most state rating bureaus require them to stay in the payroll base even though they never appear in the employee’s take-home pay.
The rule exists because workers’ compensation premium is designed to reflect the true cost of labor exposure, not the form in which wages are paid out. If deferred wages were excluded, employers could reduce premium simply by restructuring compensation through retirement plans without reducing actual payroll risk. NCCI’s Basic Manual and most independent state bureaus treat employee elective deferrals (including after-tax contributions and roth contributions) as includable remuneration for this reason, while employer contributions made independently of an employee election—such as safe harbor contributions or employer nonelective contributions—are generally excluded. Understanding contribution limits and deferral limits is essential for accurate payroll reporting.
Consider a construction company where a carpenter earns $60,000 annually and elects to defer $3,000 into a 401(k) as pre-tax contributions. For workers’ compensation rating purposes, the full $60,000 counts as eligible compensation, because the $3,000 deferral is still money the carpenter earned through labor performed on the job. If the employer separately contributes a $1,500 discretionary match or safe harbor contribution unrelated to the employee’s election, that amount is typically excluded from the payroll basis.
How Does 401(k) Contributions Work?
- The payroll election. An employee elects to defer a percentage or dollar amount of gross wages into a 401(k) plan through payroll deduction, selecting either traditional pre-tax contributions or designated roth contributions, subject to annual contribution limits and deferral limits set by the IRS with periodic cost-of-living adjustments.
- The wage split. The employer’s payroll system divides the paycheck into cash wages paid to the employee and the deferred amount routed to the retirement plan administrator, tracking the contribution rate and contribution percentage to ensure compliance with retirement plan limits.
- The classification. At audit time, the carrier’s auditor reviews payroll records to determine whether the deferred amounts qualify as includable remuneration under the applicable state manual rules, examining employee elective deferrals, catch-up contributions for older workers, and any excess contributions that may have occurred.
- The premium calculation. The auditor adds employee 401(k) deferrals back into gross payroll for rating purposes, calculating total contributions while typically excluding employer matching or safe harbor contributions from the remuneration base.
- The audit result. The insured receives an audit bill or credit reflecting the corrected payroll basis, which can differ from what the employer reported if 401(k) amounts were left out of the original payroll estimate or if excess deferrals were not properly documented before the contribution deadline.
Real Claim Examples Involving 401(k) Contributions
Manufacturing employer underreports payroll at audit
A mid-size manufacturer reported only net cash wages to its workers’ compensation carrier at policy inception, unintentionally omitting roughly $180,000 in aggregate employee elective deferrals across the workforce, including both pre-tax contributions and designated roth contributions. The premium auditor discovered the gap by comparing payroll tax filings to the numbers submitted for rating, since W-2 wages already include deferred amounts. The employer received an additional premium bill for the audit period because the deferrals should have been included in gross compensation from the start. The agency helped the client set up a corrected payroll reporting template that properly tracked contribution limits and separated employee deferrals from employer safe harbor contributions to prevent recurrence.
Construction contractor confuses match with deferral
A general contractor’s bookkeeper excluded both employee deferrals and the employer’s matching contribution from payroll reports, assuming all retirement savings contributions were exempt. The audit correctly added back the employee deferral portion (including catch-up contributions for highly compensated employees over age 50) as includable payroll but properly excluded the employer match and safe harbor contributions, producing a smaller premium increase than the contractor feared. Clear payroll coding going forward, with proper tracking of the matching contribution formula and contribution percentage, prevented the confusion from recurring at the next renewal audit.
401(k) Contributions vs. Employer Matching Contributions: What Is the Difference?
401(k) contributions, referring to employee elective deferrals, and employer matching contributions are both retirement plan funding sources but receive different treatment in workers’ compensation payroll audits. The distinction matters because misclassifying either one changes the payroll basis an insurer uses to calculate premium. Understanding the difference between employee elective deferrals and employer nonelective contributions is critical for accurate remuneration reporting.
| Comparison area | 401(k) Contributions (Employee Deferrals) | Employer Matching Contributions |
|---|---|---|
| Primary use case | Employee-elected wage deferral for retirement savings, including pre-tax contributions, roth contributions, and catch-up contributions | Employer incentive added on top of employee wages, including safe harbor contributions and nonelective contribution amounts |
| Coverage / concept type | Includable remuneration under most state manuals, subject to annual contribution limits | Generally excluded from remuneration, following matching contribution formula |
| Typical exclusions | Rarely excluded; treated as earned wages regardless of contribution rate | Usually excluded unless state manual states otherwise |
| Who is most affected by errors | Employers who underreport payroll and face audit bills, especially with excess deferrals | Employers who overreport payroll and overpay premium by including safe harbor contributions |
| Common mistakes | Leaving deferrals out of gross compensation entirely or miscalculating deferral limits | Including employer match as if it were employee wages or misclassifying nonelective contributions |
What Are the Most Common Mistakes With 401(k) Contributions?
- Excluding employee elective deferrals from reported payroll entirely, which understates remuneration and produces a surprise premium bill at audit, particularly when catch-up contributions and designated roth contributions are involved.
- Treating employer matching contributions and safe harbor contributions the same as employee deferrals, which overstates payroll and causes the client to overpay premium.
- Relying on net paycheck amounts instead of gross compensation when preparing payroll estimates, since net pay already has the deferral removed and doesn’t reflect total contributions.
- Failing to document the split between employee elective deferrals and employer nonelective contributions in payroll records, which slows down the audit and increases the chance of a dispute.
- Assuming every state applies the same rule as NCCI, when several independent bureau states have their own remuneration definitions that can differ on retirement plan treatment, contribution limits, and nondiscrimination testing requirements.
- Not tracking excess contributions or excess deferrals that exceed annual contribution limits, which can complicate audit reconciliation and require corrective distributions.
- Misunderstanding how automatic enrollment affects payroll reporting or failing to account for the contribution percentage when highly compensated employees and non-highly compensated employees have different deferral rates subject to ADP test and ACP test requirements.
How to Explain 401(k) Contributions to a Client
Explaining 401(k) Contributions to a personal lines client
This term rarely applies to personal lines, so a CSR can simply note that 401(k) contributions are a business 401k payroll and workers’ compensation concept tied to employee wages and retirement savings contributions, not something that affects a homeowners or auto policy.
Explaining 401(k) Contributions to a small business owner
Retirement plan deferrals your employees choose to put into their 401(k)—whether pre-tax contributions or roth 401 contributions—still count as payroll for workers’ compensation, even though the money never shows up in their paycheck. If your bookkeeper reports only take-home pay instead of gross compensation, the audit will likely find the gap and bill you for the difference, so it is worth reporting gross wages including those deferrals from the start. This includes any catch-up contributions for employees over 50 and applies regardless of your contribution rate or matching contribution formula. If you want to increase contributions to help employees save for retirement, remember that employee elective deferrals still count toward your workers’ comp premium base, while your safe harbor 401 match typically does not.
Explaining 401(k) Contributions to a CFO or risk manager
Employee elective deferrals—including pre-tax contributions, designated roth contributions, and catch-up contribution limit amounts—are included in remuneration for experience rating purposes under NCCI and most state bureau rules, while employer discretionary matching contributions, safe harbor contributions, and employer nonelective contributions are generally excluded. Reconciling payroll reports against W-2 gross compensation before the audit, rather than after, avoids both underpayment penalties and unnecessary premium leakage from misclassified match dollars. Pay attention to annual additions, retirement plan limits, and contribution deadline requirements to ensure accurate reporting. Understanding how nondiscrimination testing (ADP test and ACP test) affects highly compensated employees versus non-highly compensated employees can also help you anticipate any corrective distributions that might impact your payroll basis. Track total contributions carefully, monitor for excess deferrals, and account for cost-of-living adjustments to plan contribution limits each year.
Frequently Asked Questions About 401(k) Contributions
Do 401(k) contributions count as payroll for workers’ compensation?
Employee elective deferrals—including pre-tax contributions, designated roth contributions, post-tax contributions, and catch-up contributions—generally count as payroll for workers’ compensation premium calculation because they represent wages the employee earned, even though the cash was redirected into a retirement account. Employer matching contributions, safe harbor contributions, and nonelective contribution amounts are typically excluded, since they are not part of the employee’s earned wages and fall outside the definition of eligible compensation for rating purposes.
Why did my workers’ compensation audit bill increase because of 401(k) deferrals?
An audit bill often increases when the original payroll estimate was based on net or take-home pay rather than gross compensation, leaving out the employee elective deferrals including any catch-up contributions or designated roth contributions. Since most state manuals require those deferrals to be included in remuneration up to applicable contribution limits, the auditor adds them back in, raising the payroll basis and the resulting premium. Excess deferrals beyond deferral limits may also trigger adjustments if not properly documented.
Does the employer match get included in workers’ compensation payroll?
Employer matching contributions and safe harbor contributions made independently of the employee’s own election are generally excluded from remuneration under NCCI rules, unlike the employee’s own deferral. The matching contribution formula and contribution percentage do not affect this treatment. State-specific manual rules can vary, so agencies should confirm treatment in independent bureau states before advising a client definitively, particularly regarding employer nonelective contributions and whether they follow the same exclusion pattern.
How can an agency help a client avoid audit surprises related to 401(k) deferrals?
Agencies can advise clients to report gross compensation, including employee elective deferrals (both pre-tax contributions and roth contributions), at the start of the policy period rather than net pay figures. Reconciling payroll estimates against actual W-2 wage data before renewal reduces the size of any audit adjustment and helps the client budget accurately. Encourage clients to track contribution limits, monitor for excess contributions, and document their matching contribution formula and any safe harbor 401 arrangements clearly. Clients should also understand how automatic enrollment affects their contribution rate and ensure they meet the contribution deadline each year to avoid complications.
Does this rule apply the same way in every state?
NCCI’s Basic Manual rule on remuneration applies in NCCI states, but independent bureau states such as California, New York, and a handful of others maintain their own payroll definitions and may have different rules regarding retirement plan limits, nondiscrimination testing, and how they treat various types of retirement savings contributions. A pattern Total CSR sees in CSR training assessments is that many account managers assume NCCI treatment applies nationwide, which leads to incorrect payroll guidance for clients operating in independent bureau states, particularly regarding catch-up contribution limit rules and how excess deferrals are handled.
Can a client reduce workers’ compensation premium by increasing 401(k) deferrals?
Increasing employee elective deferrals does not reduce workers’ compensation premium, because the deferred amount remains part of includable remuneration regardless of contribution percentage or contribution rate. The rating basis stays tied to gross wages earned, whether those wages are paid as cash or redirected as pre-tax contributions, designated roth contributions, or after-tax contributions to save for retirement. However, if an employer chooses to increase contributions through safe harbor contributions or employer nonelective contributions rather than encouraging higher employee deferrals, those employer amounts typically remain excluded from the premium base.
What are catch-up contributions and how do they affect workers’ compensation payroll?
Catch-up contributions are additional elective salary deferrals allowed for employees age 50 and older, beyond the standard contribution limits, with a separate catch-up contribution limit adjusted periodically through cost-of-living adjustments. For workers’ compensation purposes, these catch-up contributions are treated the same as regular employee elective deferrals and are included in gross compensation for premium calculation. Some plans also allow a super catch-up contribution for employees aged 60-63, which similarly counts as includable remuneration.
How do Roth 401(k) contributions differ from traditional contributions for payroll audit purposes?
Roth 401 contributions (also called designated roth contributions) are after-tax contributions that employees make to save for retirement with tax-free qualified distributions later. For workers’ compensation payroll audits, roth contributions are treated identically to pre-tax contributions—both are employee elective deferrals included in remuneration. The tax treatment difference between roth and traditional contributions does not change how they are classified for premium calculation purposes.
What happens if an employee exceeds contribution limits during the policy period?
When an employee makes excess contributions or excess deferrals beyond the annual contribution limits, the plan administrator typically issues corrective distributions to bring the employee back into compliance with retirement plan limits. For workers’ compensation audit purposes, the original gross compensation including the excess amount is generally what counts for premium calculation, since that reflects the actual wages earned during the policy period. However, agencies should verify how their carrier handles corrective distributions, as treatment can vary by state and by the timing of the correction relative to the contribution deadline.
Do safe harbor 401(k) plans change how contributions are treated in payroll audits?
Safe harbor 401 plans require employers to make either safe harbor contributions through a specific matching contribution formula or a nonelective contribution to all eligible employees, which allows the plan to bypass certain nondiscrimination testing requirements like the ADP test and ACP test. For workers’ compensation purposes, employee elective deferrals in a safe harbor plan are still included in remuneration, while the employer’s safe harbor contributions remain excluded just like regular employer matches. The safe harbor structure does not change the fundamental classification of employee versus employer contributions.
How do highly compensated employees affect 401(k) payroll reporting?
Highly compensated employees may be subject to lower contribution percentage limits than non-highly compensated employees due to nondiscrimination testing (ADP test and ACP test requirements). For workers’ compensation payroll reporting, all employee elective deferrals count as remuneration regardless of whether the employee is highly compensated or not. However, if testing results in corrective distributions or limits on how much highly compensated employees can defer, those adjustments may affect the final payroll figures used in the audit. Agencies should ensure clients track these distinctions clearly to avoid confusion between contribution limits imposed by IRS rules versus remuneration definitions under workers’ compensation manuals.
Related Insurance Terms
- Remuneration: the total compensation, including wages, certain bonuses, employee elective deferrals, and includable retirement deferrals, used as the basis for workers’ compensation premium calculation.
- Payroll Audit: the insurer’s post-policy review of actual payroll records, including employee elective deferrals, catch-up contributions, and designated roth contributions, to true up estimated premium to actual exposure.
- Gross Payroll: total wages earned by an employee before any deductions, which forms the starting point for determining includable remuneration and eligible compensation.
- Overtime Pay Exclusion: a separate NCCI rule allowing the premium portion of overtime pay to be excluded from payroll, illustrating that not all wage components are treated identically to employee elective deferrals or retirement savings contributions.
- Experience Modification Factor: the rating factor derived partly from payroll and loss history, which can shift if payroll audits correct for previously misreported employee elective deferrals, excess contributions, or misclassified safe harbor contributions.
- Vesting Schedule: the timeline under which employees gain ownership of employer contributions, including safe harbor contributions and matching amounts; while vesting affects employee retirement benefits, it does not change how contributions are classified for workers’ compensation premium purposes.
- Automatic Enrollment: a plan feature where eligible employees are enrolled in the 401(k) at a default contribution rate unless they opt out; automatic enrollment increases the likelihood that employee elective deferrals will be present in payroll records and must be included in workers’ compensation remuneration.
Sources and References
- National Council on Compensation Insurance (NCCI). Basic Manual Rules – Remuneration.
- Internal Revenue Service. 401(k) Plans.
About the Author
Justin Goodman, CIC, CCIP, CISC, CLCS, CRIS, PCIA, QCLS, MFHR
CEO and Co-Founder, Total CSR, Inc.
Justin Goodman is a third-generation insurance broker with over two decades in agency operations. He has trained more than 50,000 CSRs, account managers, and producers in commercial and personal lines coverage, from workers’ compensation to construction risk. He was named 2024 Insurance Journal Agent of the Year and one of the nation’s top five construction insurance experts by Risk & Insurance. He is the author of Retain, which applies cognitive science research on memory and knowledge transfer to insurance training, and speaks nationally on how agencies build durable technical expertise in their teams.