9.1 SEP IRA Plan Establishment, Form 5305-SEP, and Employer Eligibility

Statutory Architecture of Simplified Employee Pensions (IRC § 408(k))

Enacted by Congress under the Revenue Act of 1978, the Simplified Employee Pension (SEP) was created to expand retirement plan coverage among small businesses by stripping away the complex administrative, actuarial, and fiduciary burdens inherent in traditional qualified plans governed by Title II of the Employee Retirement Income Security Act of 1974 (ERISA).

Codified under Internal Revenue Code (IRC) Section 408(k), a SEP is not a qualified plan in the statutory sense of IRC Section 401(a). Instead, it is an employer-sponsored arrangement under which an employer makes direct, tax-deductible contributions to individual retirement accounts or individual retirement annuities (Traditional IRAs or, under SECURE 2.0, Roth IRAs) established by or on behalf of each eligible employee. Because contributions flow directly into individual accounts owned and controlled by employees rather than into a pooled trust fund, the employer assumes no ongoing trustee responsibilities for investment management or benefit payouts.

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Eligible Employer Entities and Plan Scope

A primary commercial advantage of the SEP is its universal statutory availability. Virtually any business organization operating within the United States may establish a SEP arrangement, regardless of industry or size, including:

• Sole Proprietorships: Unincorporated businesses owned by an individual (filing IRS Schedule C or Schedule F);
• Partnerships: General partnerships, limited partnerships (LPs), and limited liability partnerships (LLPs) filing Form 1065;
• Limited Liability Companies (LLCs): Unincorporated entities taxed as sole proprietorships, partnerships, C corporations, or S corporations;
• Corporations: Both C corporations (filing Form 1120) and electing Small Business S corporations (filing Form 1120-S);
• Tax-Exempt and Non-Profit Organizations: Entities exempt under IRC Section 501(c), such as charities, churches, trade associations, and civic foundations;
• Governmental Entities: State, municipal, and regional governmental employers.

There is no statutory minimum or maximum workforce threshold for establishing a SEP. An unincorporated sole proprietor with zero common-law employees can establish a SEP solely for themselves. Conversely, an enterprise employing hundreds of workers may maintain a SEP, provided it complies with statutory coverage, eligibility, and uniform allocation mandates.

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Plan Adoption Instruments: Form 5305-SEP vs. Prototypes and Custom Plans

To establish a SEP, an employer must execute a formal, written plan agreement. The Internal Revenue Service provides three primary pathways for document adoption:

1. IRS Model Form 5305-SEP

IRS Form 5305-SEP (Simplified Employee Pension—Contribution Agreement) is a standardized model agreement designed by the Treasury to allow small employers to adopt a SEP with minimal legal overhead. Execution is straightforward: the employer fills in the business name, selects statutory eligibility criteria, signs the document, and retains it in permanent company records.

Key Operational Rule: Form 5305-SEP is never filed with the IRS, the Department of Labor (DOL), or the Pension Benefit Guaranty Corporation (PBGC). It is an internal governing document that serves as legal proof of plan establishment.

2. Absolute Restrictions on Model Form 5305-SEP Use

While Form 5305-SEP offers procedural simplicity, the IRS strictly restricts its use. An employer is legally prohibited from using model Form 5305-SEP if any of the following statutory conditions exist:

1. Maintaining Another Qualified Plan: The employer currently maintains any other qualified retirement plan, such as a 401(k), profit-sharing, defined benefit, target benefit, or money purchase pension plan. (The instructions expressly allow the employer to maintain another SEP.)
2. Eligible Employees Without IRAs: The employer has any eligible employees for whom IRAs have not been established.
3. Use of Leased Employees: The employer uses the services of any leased employees as defined under IRC Section 414(n).
4. Unincluded Controlled Group Members: The employer is part of an affiliated service group (IRC § 414(m)), a controlled group of corporations (IRC § 414(b)), or trades/businesses under common control (IRC §§ 414(c) and 414(o)), unless all eligible employees of all related entities participate in the SEP.
5. Not Paying the Cost: The employer will not pay the cost of the SEP contributions itself.

Calendar-year note: The model SEP is maintained on a calendar-year basis, but a fiscal-year employer may still use it; contributions are deductible for the employer's tax year with or within which the calendar year ends (Form 5305-SEP instructions, Rev. 12-2004).

3. Prototype SEPs and Individually Designed Plans

Employers disqualified from using model Form 5305-SEP—such as an employer that also maintains a qualified plan or uses leased employees—or employers that want features the model form lacks, such as integrating contributions with Social Security (permitted disparity),must adopt an IRS-approved prototype SEP or an individually designed SEP:

• Prototype SEPs: Sponsored by financial institutions, trust companies, mutual funds, or trade associations. The sponsor submits the master document to the IRS National Office using Form 5306-SEP (Application for Approval of Prototype Simplified Employee Pension) to secure a formal IRS favorable opinion letter. Employers then execute an adoption agreement supplied by the financial institution.
• Individually Designed SEPs: Drafted by ERISA legal counsel to address unique corporate structures or custom allocation formulas. Employers may submit these custom documents to the IRS for a determination letter.

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Plan Establishment and Funding Deadlines (IRC § 404(h)(1)(A))

A defining operational hallmark of the SEP is the statutory deadline for plan establishment and funding. Under IRC Section 404(h)(1)(A):

A SEP agreement may be executed, and deductible employer contributions may be deposited, as late as the due date (including formal extensions) of the employer's federal income tax return for that taxable year.

This statutory provision affords extraordinary retroactive tax planning flexibility. A business owner can evaluate financial performance and corporate tax liabilities well after the close of the calendar year before deciding whether to establish a SEP and how much to fund.

Extended Filing Due Date Analysis by Entity Type

Operational Example: Apex Consulting LLC, an S corporation operating on a calendar tax year, closes 2024 with unexpectedly high net income. Apex did not maintain a retirement plan during 2024. In June 2025, having filed a timely six-month extension (Form 7004) extending its tax filing deadline to September 15, 2025, Apex executes IRS Form 5305-SEP. On September 10, 2025, Apex deposits $50,000 in employer contributions directly into employee SEP IRAs. Because both execution and deposit occurred prior to the September 15 extended tax deadline, the plan is legally established for 2024, and the $50,000 is 100% deductible on Apex's 2024 Form 1120-S.

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Mandatory Employee Disclosure Requirements

An employer adopting a SEP must furnish complete disclosure documentation to every eligible employee to preserve the plan's statutory exemption from ERISA reporting:

1. Copy of Agreement: The employer must deliver a copy of the executed Form 5305-SEP (or prototype adoption agreement), along with the IRS form's general information, instructions, and questions and answers, to each eligible employee upon plan adoption.
2. Account Establishment Notice: If the employer selects or recommends the specific financial institution where accounts will be held, the employer must provide written disclosure explaining any fees, transfer costs, or withdrawal restrictions associated with that institution.
3. Annual Contribution Notification: Under Department of Labor regulations and IRC Section 408(l), whenever the employer makes a SEP contribution, it must notify each participant in writing of the exact dollar amount credited to their individual IRA. This notification must be furnished no later than the later of January 31 of the calendar year following the contribution year or 30 days after the date the contribution is deposited.

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100% Immediate Nonforfeitable Vesting (IRC § 408(k)(4))

Under IRC Section 408(k)(4), an employer maintaining a SEP is statutorily prohibited from imposing any vesting requirements on contributions:

All employer contributions made to a participant's SEP IRA must be 100% immediately nonforfeitable and fully vested upon deposit.

Unlike traditional qualified plans that may implement up to a 3-year cliff or a 6-year graded vesting schedule for employer contributions, a SEP permits zero delayed vesting. Furthermore, under IRC Section 408(k)(4)(B), the employer cannot condition contributions on the retention of funds in the employee's account, nor can the employer place any contractual restrictions or withdrawal penalties on the employee's right to distribute or transfer the funds.

Once an employer deposits money into an employee's Traditional or Roth IRA, the employee exercises complete legal ownership. An employee may withdraw the assets the very next day (subject to standard individual income tax and applicable Section 72(t) early withdrawal excise taxes), and the employer has no legal recourse to forfeit or claw back those funds.

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Total Exemption from Annual Form 5500 Reporting Series

A critical technical distinction tested on the CISP examination is the contrast between qualified retirement plans and SEPs regarding annual regulatory reporting:

• Qualified Plans (IRC § 401(a), 401(k)): Must prepare and file the extensive annual return/report series—Form 5500, Form 5500-SF, or Form 5500-EZ—annually with the Department of Labor and IRS, often requiring independent CPA financial statement audits, ERISA fidelity bonds, and actuarial schedules.
• SEP Arrangements (IRC § 408(k)): Under Department of Labor Regulation 29 CFR 2520.104-48, an employer that adopts model Form 5305-SEP (or an approved prototype) and satisfies employee disclosure mandates is completely exempt from filing Form 5500. There are no annual filings with the DOL, IRS, or PBGC. Financial institutions handle all IRS reporting at the individual account level using Form 5498 (reporting contributions) and Form 1099-R (reporting distributions).

Comparative Architectural Matrix

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Realistic Bank Administrative Scenario: Post-Year-End Plan Adoption & Compliance Audit

At Oakmont Trust & Wealth Management, CISP certified officer Brenda consults with Dr. Julian Vance, owner of Vance Orthopedics LLC (an S corporation). On July 14, 2025, Dr. Vance requests guidance on establishing a retroactive retirement plan for the 2024 tax year to offset a $120,000 corporate tax liability.

Client Profile and Operational Facts

1. Vance Orthopedics operates on a calendar year. The corporation filed Form 7004 on March 1, 2025, obtaining a valid extension to file its 2024 Form 1120-S by September 15, 2025.
2. The corporation employs Dr. Vance (W-2 salary of $250,000) and three full-time clinical nurses (each earning $60,000 in W-2 wages and employed since 2020).
3. The corporation currently maintains no qualified retirement plan and uses no leased employees.
4. Dr. Vance asks Brenda if the company can adopt an IRS model Form 5305-SEP today, contribute 20% of compensation for himself and all employees for 2024, require the three nurses to remain employed for two full years before their contributions vest, and skip filing Form 5500.

Administrative Review and CISP Compliance Determinations

1. Establishment and Funding Timeliness: Brenda verifies that because the corporation obtained a valid extension to September 15, 2025, adopting the SEP in July 2025 and depositing contributions prior to September 15, 2025 complies fully with IRC Section 404(h)(1)(A). The contributions will be fully deductible for the 2024 tax year.
2. Eligibility to Use Form 5305-SEP: Brenda reviews the statutory prohibitions on model Form 5305-SEP. Vance Orthopedics maintains no other qualified plan, has no leased employees, is not part of a controlled or affiliated service group, will set up IRAs for all eligible employees, and will pay the contributions itself. The corporation is fully eligible to execute Form 5305-SEP.
3. Overriding the Vesting Proposal: Brenda corrects Dr. Vance's assumption regarding a 2-year vesting requirement. Under IRC Section 408(k)(4), all SEP contributions must vest 100% immediately. Vance Orthopedics cannot impose any cliff or graded vesting schedule, nor can it restrict the nurses from withdrawing their funds once deposited into their individual IRAs.
4. Form 5500 Exemption: Brenda confirms that Vance Orthopedics is completely exempt from filing Form 5500. Brenda facilitates the opening of individual SEP IRAs for Dr. Vance and each nurse, assists Dr. Vance in executing Form 5305-SEP, provides the mandatory employee disclosures, and sets up the ledger accounting for the September deposit.