Form 5300 Instructions: Filing, Fees, and IRS Review

Form 5300 is how an employer asks the IRS to confirm in writing that an individually designed retirement plan meets the qualification rules under Internal Revenue Code Section 401(a) and that its trust is tax-exempt under Section 501(a). The Form 5300 instructions require electronic submission through Pay.gov, advance written notice to interested parties, a complete plan document with all amendments, and payment of a user fee. The steps below walk through eligibility, the paperwork to assemble, the notice window, how to complete each part of the form, and what happens after the IRS receives your application.

Confirm You’re Eligible to File

The determination letter program is limited to individually designed plans, meaning documents drafted for a single employer or employer group rather than pre-approved off-the-shelf plans. Employers no longer file on a recurring cycle; the IRS accepts Form 5300 only in specific circumstances:

Initial qualification of a new individually designed plan that has never received a favorable determination letter, whether through Form 5300 or the discontinued Form 5307.¹
Partial plan termination rulings, where a significant reduction in plan participation may trigger full vesting.
Other circumstances the IRS announces, such as certain plan mergers, when the program is opened for those situations.

One boundary worth flagging: if the plan is fully terminating, you file Form 5310, not Form 5300. Form 5310 must be filed no later than one year from the termination’s effective date or the date the termination action was taken, and no later than 12 months after substantially all plan assets have been distributed.²

Gather Your Documents First

Pulling the package together before opening Pay.gov avoids repeated back-and-forth. You’ll need:

The complete, current plan document, including any trust instrument or adoption agreement
All signed and dated amendments adopted since the plan was last restated or since inception
The most recent favorable determination letter, if one was previously issued
The employer’s EIN (not the trust’s), matching what appears on Form 5500 filings
Census data, including total participant count, to complete several lines on the form

If a third-party administrator, attorney, or consultant will file on the employer’s behalf, include a signed Form 2848 (Power of Attorney and Declaration of Representative). Filing Form 2848 automatically revokes any earlier power of attorney on file with the IRS for the same plan and tax matters, so if you want a prior authorization kept in place, check the designated box on the new form and attach the earlier one.³

One item catches filers off guard. If the plan has been through corrections under the IRS Employee Plans Compliance Resolution System, include a copy of any Voluntary Correction Program compliance statement or Audit Closing Agreement Program closing agreement related to the plan.⁴

Send the Interested-Party Notice Before You File

Written notice to interested parties, generally current plan participants and certain employees eligible to participate, must go out no fewer than 10 days and no more than 24 days before the application is submitted.⁵ Miss that window and the application can be derailed before it starts.

The notice must include:

The plan name, plan identification number, and plan administrator’s name
The applicant’s name and taxpayer identification number
Whether the application relates to initial qualification, an amendment, termination, or partial termination
A description of which employees are eligible to participate
Whether the IRS has previously issued a determination letter for the plan
A statement that interested parties may submit comments to the IRS or ask the Department of Labor to do so on their behalf, along with the comment deadline

Unless the plan has fewer than 26 participants, you must also make available an updated copy of the plan document and a copy of the determination letter application. For plans with 25 or fewer participants, you can substitute a summary covering eligibility rules, benefit formula, vesting provisions, and circumstances that could cause loss of benefits.⁵

Complete Form 5300 Part by Part

The form works through identification, plan characteristics, and specialized issues, with detail increasing as you go.

Part I: Identification and Purpose Code

Part I asks for the plan sponsor’s name, address, and EIN; the plan name and three-digit plan number; and a code identifying why you’re filing:

Code 1: a new plan submitted within its initial remedial amendment period.
Code 2: an existing plan that has never received a favorable determination letter.
Code 3: a plan authorized to apply under other specific IRS guidance, such as certain plan mergers. Code 3 requires an attachment explaining which guidance applies and how the plan qualifies.⁴

Part II: Plan Characteristics

Part II captures whether the plan is defined benefit or defined contribution, whether it covers collectively bargained employees, and whether it uses a nondiscrimination safe harbor. If the plan relies on a safe harbor, attach a statement identifying the relevant plan sections and specifying which regulatory safe harbor the plan satisfies.⁴

Part III and Schedule Q

Part III handles required statements and more complex features, such as permitted disparity (integrating plan benefits with Social Security). If you want the IRS to rule on qualification requirements beyond the standard scope of the letter, such as minimum participation, coverage, or nondiscrimination testing, attach Schedule Q (Elective Determination Requests). Schedule Q is optional, and it’s worth using when a plan has unusual design features that could raise questions later.

The Procedural Requirements Checklist

A Procedural Requirements Checklist accompanies the filing, confirming that every required attachment is included. Treat it as your final quality check before you upload.

Submit Through Pay.gov and Pay the User Fee

Paper submissions are no longer accepted. The full application goes through Pay.gov as a single PDF containing the form and all attachments. That PDF cannot exceed 15 megabytes.⁶ If the file is oversized, the IRS instructions say to remove items pushing it over the limit and call IRS Customer Accounts Services at 877-829-5500 for guidance on submitting those items separately.⁴

The user fee is authorized by IRC Section 7528 and paid electronically as part of the Pay.gov submission.⁷ Amounts vary by plan type and are updated each year through revenue procedures; the 2026 schedule is in Revenue Procedure 2026-4, Appendix A. Expect fees in the range of several thousand dollars for a standard single-employer plan, with higher amounts for multiple-employer plans.⁸

The Small-Employer Fee Exemption

Employers with 100 or fewer employees may qualify for a full user-fee exemption, but only if all of the following are true:

The employer had 100 or fewer employees receiving at least $5,000 in compensation in the calendar year before filing
At least one non-highly compensated employee participated in the plan during the prior year, or during the first plan year if the application is filed then
The application is filed before the later of the last day of the plan’s fifth year in existence or the end of any remedial amendment period beginning within those first five years

All members of a controlled group, partnership, or affiliated service group count as a single employer for the 100-employee threshold, and leased employees count as employees. When multiple employers maintain the plan, every participating employer must independently qualify.⁸

What Happens After You File

The IRS runs a procedural completeness check first, then routes the case to a specialist for technical review of the plan document against current qualification requirements. No determination letter will issue until at least 60 days have passed from the control date, because that window exists for interested parties, the Department of Labor, and the Pension Benefit Guaranty Corporation to submit comments.⁹

If the specialist spots problems or needs clarification, you’ll get a written information request. Answer promptly and thoroughly. The IRS doesn’t publish a guaranteed processing timeline, and delays compound quickly when responses drag.

If the IRS Proposes to Deny the Application

An adverse letter doesn’t arrive without warning. The IRS first sends a preliminary notification describing that it’s considering an adverse determination. If it moves forward, it issues Letter 1755, the formal proposed adverse determination, giving the plan sponsor 30 days to respond. Within that window, the sponsor can provide additional information, file a written appeal, agree in writing, or not respond.¹⁰

A written appeal filed within 30 days sends the case to IRS Appeals, where an Appeals Officer independently decides whether to issue an adverse or favorable letter. Without a response, or with an agreed adverse finding, the case moves to a final adverse determination letter. From that final letter, the sponsor has 92 days to petition the Tax Court.¹⁰

Why the Letter Is Worth the Effort

A favorable determination letter is the employer’s formal IRS confirmation that contributions are deductible, trust earnings grow tax-free, and participants defer taxes on benefits until distribution. If a plan loses qualified status, employer contributions to the trust cannot be deducted in the year made; the deduction shifts to when the contribution is includible in the employee’s gross income and is capped at that included amount. For defined benefit plans and other plans without separate employee accounts, the deduction may be lost entirely. Contributions also become subject to Social Security, Medicare, and FUTA taxes.¹¹

Participants take a hit too. Vested employer contributions during disqualified years generally must be included in income, with highly compensated employees typically including their entire vested account balance. Distributions from a disqualified plan cannot be rolled over to an IRA or another eligible retirement plan, so every dollar out is taxable with no deferral.¹¹ That’s what a clean Form 5300 filing is protecting against.

1
Internal Revenue Service. Apply for a Determination Letter – Individually Designed Plans
2
Internal Revenue Service. About Form 5310, Application for Determination for Terminating Plan
3
Internal Revenue Service. Form 2848, Power of Attorney and Declaration of Representative
4
Internal Revenue Service. Instructions for Form 5300
5
Internal Revenue Service. Retirement Plan Notices to Interested Parties
6
Pay.gov. Application for Determination for Employee Benefit Plan
7
Office of the Law Revision Counsel. 26 US Code 7528 – Internal Revenue Service User Fees
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Internal Revenue Service. User Fees for Employee Plans Determination, Opinion and Advisory Letters
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Internal Revenue Service. Employee Plans Determination Letter Program
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Internal Revenue Service. Proposed Adverse Cases
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Internal Revenue Service. Tax Consequences of Plan Disqualification