IRS Form 5305-A-SEP Guide: SARSEP Rules & Instructions

Introduction: What Is IRS Form 5305-A-SEP?

IRS Form 5305-A-SEP, titled Salary Reduction Simplified Employee Pension—Individual Retirement Accounts Contribution Agreement (SARSEP), is a model retirement plan document published by the Internal Revenue Service (IRS). It is governed under Section 408(k)(6) of the Internal Revenue Code (IRC).

A SARSEP is a specialized Simplified Employee Pension (SEP) plan that permits eligible employees to make pre-tax elective salary deferrals directly into their individual Traditional SEP-IRAs, similar to a 401(k) plan. Form 5305-A-SEP acts as the master agreement establishing the operating rules for the plan.

Under federal tax law, new SARSEPs cannot be established today. However, Form 5305-A-SEP remains an active, essential document for employers who established a SARSEP before 1997 and continue to maintain and operate it for current and newly hired workers.

Purpose of the Form

Congress repealed the ability to create new SARSEP plans as part of the Small Business Job Protection Act of 1996, replacing them with SIMPLE IRA plans. However, Congress included a grandfather clause allowing existing SARSEP plans established on or before December 31, 1996, to continue operating indefinitely.

Form 5305-A-SEP provides these grandfathered employers with an IRS pre-approved model agreement. It defines employee eligibility standards, maximum salary deferral formulas, mandatory non-discrimination testing rules, and immediate vesting rights.

Using this standardized form allows qualifying small employers to amend and maintain their grandfathered plans in full compliance with ongoing federal tax updates without having to draft costly custom legal documents.

Who Needs to File / Maintain This Form

Form 5305-A-SEP is used exclusively by employers who maintain an active, grandfathered SARSEP. You must use and maintain this agreement if you meet all of the following requirements:

• Grandfathered Plan Status: Your business established a valid SARSEP retirement plan on or before December 31, 1996.
• 25 or Fewer Eligible Employees: You had 25 or fewer eligible employees at all times during the entire preceding tax year.
• 50% Participation Requirement: At least 50% of all eligible employees choose to make pre-tax salary reduction contributions during the current plan year.
• Plan Restatements: You are updating or restating your existing pre-1997 SARSEP to ensure compliance with current federal tax laws.

Who Is Exempt / Not Allowed to Establish or Use It

Because of strict statutory restrictions, many businesses are legally barred from using Form 5305-A-SEP. You cannot use this form under any of the following conditions:

• New Retirement Plans: Any business founded after 1996, or any business that did not establish a SARSEP before January 1, 1997, cannot adopt Form 5305-A-SEP. These employers must use standard SEP IRAs (Form 5305-SEP), SIMPLE IRAs (Form 5304/5305-SIMPLE), or 401(k) plans.
• Over 25 Employees: Employers who employed more than 25 eligible employees in the preceding tax year are not permitted to accept salary reduction deferrals.
• Failed Participation Threshold: If fewer than 50% of eligible employees elect to defer salary in a given plan year, the plan cannot accept employee deferrals for that year.
• Employers with Other Active Plans: Employers who maintain another active qualified retirement plan (such as a defined benefit pension plan) alongside the SARSEP.

When to File / Adopt / Execute

Form 5305-A-SEP is an agreement maintained within the business rather than an annual tax filing. However, employers must observe the following recurring timelines:

• Annual Employee Notification: Employers must provide eligible employees with a copy of Form 5305-A-SEP, its instructions, and a model Salary Reduction Agreement before the start of each calendar year (or upon hire for new employees).
• Contribution Deadlines: Employer non-elective contributions must be deposited by the due date of the employer’s federal income tax return (including extensions).
• Salary Deferral Deposits: Employee salary reductions must be transferred to each employee’s SEP-IRA as soon as administratively feasible, but no later than 30 days after the end of the month in which the wages were withheld.

Where and How to File / Retain

It is crucial to understand that Form 5305-A-SEP is never mailed to or filed with the IRS. It is an internal compliance document that must be executed and retained by the employer.

• Employer Records: The business owner must sign and safely store the executed master agreement in the company’s permanent tax and benefits files.
• Employee Distribution: A completed copy of the agreement, explanatory disclosures, and a Salary Reduction Agreement must be provided to every eligible worker.
• Employee Elections: Participating employees complete and sign their individual salary reduction agreements, which are retained in the employer’s payroll records.

Step-by-Step Instructions to Fill Form 5305-A-SEP

Form 5305-A-SEP is structured into employer identification items, statutory eligibility provisions, deferral rules, non-discrimination testing terms, and employee election agreements.

Section	Key Focus Areas	What to Enter / Agree To
Header Section	Employer Identification	Enter the legal business name, physical address, and Employer Identification Number (EIN).
Article I: Eligibility	Participation Requirements	Specify the minimum age (up to 21) and service requirements (service in up to 3 of the last 5 years). Outline compensation thresholds and any permitted exclusions (e.g., union employees or nonresident aliens).
Article II: Contributions	Salary Reductions & Funding	Defines employee elective deferral percentage limits and confirms whether the employer will provide discretionary non-elective contributions to all eligible workers.
Article III: Statutory Tests	Participation & ADP Limits	Affirms compliance with the mandatory 50% employee participation rule and the 125% non-discrimination deferral test for Highly Compensated Employees (HCEs).
Employer Signature	Plan Execution	The authorized business owner or corporate officer signs and dates the document to confirm adoption.
Salary Reduction Agreement	Employee Authorization	Completed by participating employees to designate their pre-tax deferral percentage or specific dollar amount per payroll period.

Understanding the 50% Participation Rule (Article III)

For a SARSEP to accept elective deferrals in any plan year, at least 50% of all eligible employees must actually choose to defer a portion of their salary. If your business has 10 eligible workers, at least 5 must make salary deferrals. If this threshold is not met, no employee deferrals are permitted for that year.

The 125% Deferral Limitation Test

To prevent business owners and top earners from disproportionately benefiting, SARSEPs require an annual non-discrimination test. The average deferral percentage of Highly Compensated Employees (HCEs) cannot exceed 125% (1.25 times) the average deferral percentage of all eligible Non-Highly Compensated Employees (NHCEs).

Required Documents and Information Needed Before Filling

To properly complete and maintain Form 5305-A-SEP, assemble the following business records:

• Pre-1997 Plan Documentation: Historical records and original adoption agreements proving your SARSEP was established prior to January 1, 1997.
• Payroll and Census Data: Annual employee census reports showing gross wages, birthdates, hire dates, and hours worked to determine eligibility and HCE status.
• Annual ADP Testing Worksheets: Mathematical testing sheets calculating the 125% non-discrimination deferral limit for each plan year.
• Signed Salary Reduction Agreements: Completed, signed employee deferral election forms for every participating worker.

Common Mistakes to Avoid

• Attempting to Form a New SARSEP: Submitting or executing Form 5305-A-SEP for a business that did not have an established SARSEP in place before 1997 is completely invalid under federal law.
• Mailing the Form to the IRS: Sending Form 5305-A-SEP to the IRS creates unnecessary paperwork; the IRS does not retain or process these internal model agreements.
• Exceeding the 25-Employee Limit: Allowing employee deferrals in a year following a year in which you had more than 25 eligible employees violates statutory rules.
• Failing the 50% Participation Rule: Continuing payroll deductions when fewer than half of eligible employees choose to contribute.
• Ignoring the 125% ADP Test: Failing to perform annual testing or failing to distribute excess deferrals to HCEs within 2½ months following the end of the plan year.
• Late Remittance of Deferrals: Holding employee wage deferrals past the 30-day statutory deposit deadline.

Penalties and Compliance Risks

Failing to operate a SARSEP in strict accordance with IRC Section 408(k)(6) rules leads to severe tax and regulatory consequences:

• Excess Contribution Excise Tax: If an HCE defers more than permitted under the 125% test and the excess is not refunded within 2½ months after year-end, the employer faces a 10% excise tax under IRC Section 4979 on Form 5330.
• Department of Labor Penalties: Late transmission of employee payroll deferrals constitutes a prohibited transaction, resulting in DOL audit penalties and mandatory interest payments.
• Plan Disqualification: Violating basic SARSEP rules can disqualify the plan, resulting in the disallowance of employer tax deductions and converting all past contributions into immediately taxable income for employees.

Related Forms and Schedules

Employers maintaining a grandfathered SARSEP plan frequently use the following related tax forms:

• Form 5305-SEP: Simplified Employee Pension—Individual Retirement Accounts Contribution Agreement (for standard employer-only SEPs).
• Form 5304-SIMPLE / Form 5305-SIMPLE: Savings Incentive Match Plan for Employees of Small Employers (modern alternative for small business employee deferrals).
• Form W-2: Wage and Tax Statement, where pre-tax elective deferrals are reported in Box 12 using Code F.
• Form 5498: IRA Contribution Information, issued annually by the financial custodian to report contributions.
• Form 5330: Return of Excise Taxes Related to Employee Benefit Plans (used to pay excise taxes on late refunds of excess contributions).
• Form 1099-R: Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, etc.

Frequently Asked Questions (FAQs)

1. Can I set up a brand-new SARSEP plan today?

No. Federal law prohibited the creation of new SARSEPs after December 31, 1996. Only employers with continuous plans established before 1997 may use Form 5305-A-SEP.

2. Can newly hired employees participate in a grandfathered SARSEP?

Yes. If your company maintains an active grandfathered SARSEP, any new employee who meets the plan’s eligibility criteria can participate and make pre-tax salary reduction contributions.

3. Do I send Form 5305-A-SEP to the IRS?

No. Form 5305-A-SEP is an agreement kept in the employer’s permanent records. It is never mailed to the IRS.

4. What happens if our business has 28 eligible employees this year?

If you have more than 25 eligible employees in a tax year, your employees cannot make salary reduction contributions for the following tax year. The plan would be limited to employer-only non-elective contributions.

5. How are employee salary deferrals reported on Form W-2?

Employee elective deferrals to a SARSEP are reported on Form W-2 in Box 12 using Code F. These contributions reduce the employee’s taxable wages in Box 1 (federal income tax) but remain subject to Social Security and Medicare taxes in Boxes 3 and 5.

6. Are employer contributions to a SARSEP mandatory?

No. Unlike SIMPLE IRAs which require mandatory annual employer contributions, employer non-elective contributions to a SARSEP are discretionary from year to year.

Conclusion

IRS Form 5305-A-SEP is an essential legal agreement that enables pre-1997 grandfathered small employers to continue offering tax-advantaged salary deferrals to their workforce. By eliminating the administrative complexity of full 401(k) plans, it remains a valuable legacy retirement benefit.

To preserve your plan’s qualified tax status, ensure your business never exceeds 25 eligible employees, verify that at least 50% of eligible workers participate each year, perform the 125% non-discrimination test annually, and keep all executed plan documents securely in your business files.