Introduction: What Is IRS Form 15417-C?

IRS Form 15417-C, officially titled 403(b) Plan – Coverage and Nondiscrimination Requirements for Employer Contributions (Other than Matching Contributions) Worksheet 5B – Determination of 403(b) Status, is an administrative compliance and technical review worksheet issued by the Internal Revenue Service (IRS). Governed by the Department of the Treasury and administered through the Employee Plans division of the Tax Exempt and Government Entities (TE/GE) branch, this document examines how employers allocate direct contributions among their workforce.

Section 403(b) retirement plans are tax-sheltered programs sponsored by 501(c)(3) charitable nonprofit organizations, hospitals, private colleges, and public schools. While employees frequently make their own salary deferrals into these plans, many employers also provide nonelective contributions—direct, employer-paid funding that does not depend on whether an employee chooses to contribute.

Form 15417-C serves as Worksheet 5B in the IRS retirement plan examination series. It provides a standardized checklist used by plan administrators, employee benefit attorneys, and IRS agents to confirm that employer contributions do not discriminate in favor of highly compensated executives over rank-and-file workers.

Purpose of the Form: Why Does Form 15417-C Exist?

Under the Internal Revenue Code (IRC), tax-favored retirement plans are prohibited from providing disproportionate benefits to high earners, company officers, or board members. While employee elective deferrals in a 403(b) plan are governed by the separate “Universal Availability” rule, employer-paid contributions are subject to the strict nondiscrimination and minimum coverage standards of IRC Section 403(b)(12)(A)(i).

These rules require employer nonelective contributions to satisfy both IRC Section 410(b) (minimum coverage testing) and IRC Section 401(a)(4) (nondiscrimination in contribution amounts). Evaluating these complex mathematical tests requires clear documentation and careful analysis of plan terms.

Form 15417-C solves this challenge by organizing coverage tests, contribution formulas, compensation caps, and permitted disparity rules into a clear diagnostic tool. Plan sponsors use it to verify their plan language before applying for a formal IRS Determination Letter or conducting an internal compliance audit.

Who Needs to Use Form 15417-C?

Form 15417-C is an administrative instrument used by organizations and benefits professionals responsible for sponsoring, testing, or reviewing 403(b) plans:

501(c)(3) Nonprofit Plan Sponsors: Charitable institutions, private universities, and healthcare organizations providing direct employer contributions that are applying for an IRS Determination Letter on Form 5300 or Form 5307.
Third-Party Administrators (TPAs): Benefits administration firms performing annual nondiscrimination testing to ensure plan allocations remain within statutory limits.
ERISA and Employee Benefit Attorneys: Legal specialists drafting custom plan language or preparing correction filings under the IRS Employee Plans Compliance Resolution System (EPCRS).
IRS Employee Plans Examiners: Government auditors reviewing retirement plan records to evaluate whether a plan’s operational allocations comply with federal tax law.

Who Is Exempt or Not Required to Use This Form?

Many organizations and retirement plans are exempt from the requirements evaluated on Form 15417-C:

Salary-Deferral-Only Plans: If a 403(b) plan only permits voluntary employee salary deductions and offers no employer nonelective contributions, this worksheet does not apply.
Governmental 403(b) Plans: Under IRC Section 403(b)(1)(D), public school districts and state universities are exempt from Section 410(b) coverage and Section 401(a)(4) nondiscrimination rules.
Nonelecting Church Plans: Church organizations and Qualified Church-Controlled Organizations (QCCOs) that have not elected to be covered by federal participation mandates are exempt under IRC Section 403(b)(12)(B).
Plans With Employer Matching Only: Employer contributions that match employee deferrals are evaluated separately under Worksheet 11A (Form 15417-F) rather than Worksheet 5B.
Individual Plan Participants: Everyday workers and plan participants never complete or submit this form.

When to File and Implement: Deadlines and Frequency

Form 15417-C is an event-based compliance worksheet rather than an annual tax filing with a set calendar due date. Key triggering events include:

Determination Letter Applications: Submitted alongside Form 5300 or Form 5307 when an employer requests formal IRS approval for an individually designed 403(b) plan.
Plan Formula Amendments: Completed whenever an employer modifies its employer contribution formula, alters allocation criteria, or changes service accrual conditions.
Annual Nondiscrimination Testing: Reviewed at the end of each plan year to ensure that demographic shifts in the workforce did not cause the plan to fail coverage tests.
IRS Plan Audits: Required when an IRS revenue agent examines a 403(b) plan to evaluate how employer contributions were calculated and allocated.

Where and How to File Form 15417-C

The submission or retention process for Form 15417-C depends on how the worksheet is being used:

Electronic Submission via Pay.gov: When applying for a formal IRS Determination Letter, employers file Form 5300 electronically through the federal Pay.gov portal. Completed worksheets, plan documents, and required user fees are submitted as digital attachments.

Retention in Fiduciary Records: When used for internal compliance monitoring or annual plan maintenance, the completed worksheet is retained in the employer’s permanent benefits records.

Submission During IRS Audits: If Form 15417-C is requested during an IRS examination, submit the worksheet and supporting testing data directly to the examining agent or mail them to the official IRS address as per instructions provided in your audit notification.

Step-by-Step Instructions to Fill Out Form 15417-C

Form 15417-C (Worksheet 5B) is arranged in diagnostic format. A “Yes” response indicates statutory compliance, while a “No” response flags an issue that must be explained in the designated narrative section. If a specific requirement does not apply to the plan, mark “N/A.”

Section / Part	Compliance Category	Required Verification & Statutory Standard
Plan Header Details	Administrative Identity	Enter the legal Plan Name, Employer Identification Number (EIN), and three-digit Plan Number.
Part I: Minimum Coverage	IRC Section 410(b) Testing	Confirm the plan satisfies either the 70% Ratio Percentage Test or the Average Benefit Test for non-highly compensated employees.
Part II: Excludable Workers	Statutory Exclusions	Verify that exclusions from coverage testing are limited to legally permissible categories (such as nonresident aliens or age/service minimums).
Part III: Nondiscrimination	IRC Section 401(a)(4) Design	Confirm employer contributions follow a design-based safe harbor (uniform percentage or uniform dollar amount) or satisfy the general test.
Part IV: Compensation Rules	IRC Sections 401(a)(17) & 414(s)	Verify that compensation is defined properly and capped at the annual statutory dollar limit.
Part V: Permitted Disparity	IRC Section 401(l) Integration	If the plan coordinates contributions with Social Security, ensure the formula does not exceed statutory integration limits.
Explanation Block	Deficiency Justifications	Provide detailed statutory or plan-specific explanations for any “No” answers marked on the worksheet.

Detailed Walkthrough of Major Compliance Areas

Part 1: Minimum Coverage Testing (IRC Section 410(b)). The plan must cover a nondiscriminatory percentage of workers. Most employers satisfy this by passing the Ratio Percentage Test, meaning the percentage of Non-Highly Compensated Employees (NHCEs) benefiting under the plan is at least 70% of the percentage of Highly Compensated Employees (HCEs) benefiting.

Part 2: Design-Based Safe Harbors (IRC Section 401(a)(4)). The simplest way to prove nondiscrimination is through a design-based safe harbor. A plan qualifies if it allocates contributions using a uniform percentage of compensation (such as 5% of pay for everyone) or a uniform dollar amount (such as $2,000 per employee).

Part 3: Compensation Limits (IRC Section 401(a)(17)). The plan document must state that compensation taken into account for allocations cannot exceed the annual statutory limit set by the IRS. Allocating contributions on earnings above this threshold constitutes an operational failure.

Part 4: Document Cross-References. In the left column of each item, record the exact article, section, and page number in your written plan document where the rule appears. IRS agents rely on these citations during application reviews.

Required Documents and Information Needed Before Filling

Assemble the following technical records before completing Form 15417-C:

The Written 403(b) Plan Document: The master text, adoption agreements, and all executed plan amendments.
Annual Employee Census Data: Detailed records of all employees, including dates of hire, total hours worked, compensation, and designated HCE or NHCE status.
Annual Coverage and Nondiscrimination Test Reports: Quantitative testing documentation prepared by your third-party administrator or actuary.
Payroll Compensation Records: Documentation verifying that the definition of pay used for allocations satisfies IRC Section 414(s).
Form 5300 Application File: The core application packet if applying for a formal IRS Determination Letter.

Common Mistakes to Avoid

Plan administrators frequently encounter several recurring errors when evaluating employer nonelective contributions:

Confusing Universal Availability with Coverage Testing: Universal availability applies only to employee elective deferrals. Employer nonelective contributions must separately satisfy IRC Section 410(b) coverage and Section 401(a)(4) nondiscrimination rules.
Imposing Harsh Accrual Requirements: Requiring employees to be employed on the last day of the plan year or work 1,000 hours to receive an allocation can cause the plan to fail the 70% coverage test if mid-year turnover is high.
Using a Discriminatory Definition of Pay: Calculating employer contributions using an unapproved compensation definition (such as excluding overtime or bonuses earned primarily by non-executives) can cause safe-harbor formulas to fail.
Exceeding Annual Compensation Limits: Calculating contributions on executive salaries that exceed the annual IRC Section 401(a)(17) limit will trigger plan defects.
Leaving “No” Answers Unexplained: Submitting a worksheet with unannotated “No” responses will cause IRS reviewing agents to return your application or issue an inquiry letter.

Consequences of Non-Compliance or Errors

Failing coverage or nondiscrimination testing undermines the tax-qualified status of a 403(b) plan, leading to severe penalties:

Determination Letter Denial: The IRS will refuse to grant a favorable determination letter for an individually designed plan, leaving the plan without government validation.
Loss of Tax-Deferred Status: If employer contributions fail Section 403(b)(12), those contributions lose their tax-deferred status under IRC Section 403(c).
Immediate Employee Tax Liability: Vested employer contributions become immediately taxable to affected employees as gross income.
Employer Payroll Tax Deficiencies: Sponsoring employers become liable for back withholding taxes, Social Security (FICA), and Medicare payments on disqualified allocations.
Costly Voluntary Corrections: Fixing nondiscrimination failures through the Employee Plans Compliance Resolution System requires retroactive employer contributions with lost earnings to non-highly compensated workers, along with IRS user fees.

Related Forms and Publications

Form 15417-C operates within an interconnected system of IRS retirement plan worksheets and application forms:

Form 15417: 403(b) Plan – Eligibility and Participation (Worksheet 1A).
Form 15417-A: 403(b) Plan – Minimum Vesting Standards (Worksheet 2B).
Form 15417-B: 403(b) Plan – Miscellaneous Provisions (Worksheet 4A).
Form 15417-D: 403(b) Plan – Plan Limitation on Contributions and Benefits (Worksheet 6A).
Form 15417-F: 403(b) Plan – Nondiscrimination Requirements for Matching Contributions and Employee After-Tax Contributions (Worksheet 11A).
Form 5300: Application for Determination for Employee Benefit Plan.
Form 5307: Application for Determination for Adopters of Modified Pre-Approved Plans.
Publication 571: Tax-Sheltered Annuity Plans (403(b) Plans) for Employees of Public Schools and Certain Tax-Exempt Organizations.

Frequently Asked Questions (FAQs)

Do individual employees complete Form 15417-C?

No. Form 15417-C is an administrative technical worksheet used exclusively by plan sponsors, benefits administrators, actuaries, and IRS examiners. Individual participants do not file this form.

What is the difference between elective deferrals and nonelective contributions?

Elective deferrals are pre-tax or Roth contributions that employees choose to deduct from their own paychecks. Nonelective contributions are direct contributions made entirely by the employer, regardless of whether the employee saves on their own.

What is a Highly Compensated Employee (HCE)?

An HCE is generally defined under IRC Section 414(q) as an employee who owned more than 5% of the organization at any time during the year or preceding year, or received compensation above a statutory dollar threshold set annually by the IRS.

Are public schools required to complete Form 15417-C?

No. Public school districts and state colleges are governmental entities. Under IRC Section 403(b)(1)(D), governmental plans are exempt from the coverage and nondiscrimination requirements evaluated on Worksheet 5B.

What is the 70% Ratio Percentage Test?

It is a mathematical test under IRC Section 410(b) requiring that the percentage of non-highly compensated employees benefiting under the plan must be at least 70% of the percentage of highly compensated employees benefiting.

Is Form 15417-C submitted to the IRS every year?

No. Form 15417-C is an event-based diagnostic tool. It is submitted when applying for an IRS Determination Letter, updating plan formulas, or responding to an official IRS retirement plan examination.

Conclusion: Key Takeaways

IRS Form 15417-C, 403(b) Plan – Coverage and Nondiscrimination Requirements for Employer Contributions Worksheet 5B, is an indispensable tool for maintaining the legal standing of nonprofit retirement plans. It ensures that employer contributions are distributed fairly and do not favor executives over everyday employees.

By reviewing allocation formulas, verifying minimum coverage ratios, and observing annual compensation caps, plan sponsors can protect their organizations from costly penalties and plan disqualification. Using Form 15417-C for periodic compliance reviews gives employers confidence that their 403(b) retirement benefits remain fully compliant with federal tax law.

IRS Form 15417-C Guide: 403(b) Contribution Rules Explained