Yes, you can set up a Simplified Employee Pension (SEP) plan in under an hour by completing IRS Form 5305-SEP, a single-page model document that lets small businesses and self-employed people make tax-deductible retirement contributions of up to 25% of compensation or $70,000 for 2025, whichever is less. The form does not get filed with the IRS. You sign it, keep it in your records, hand a copy to every eligible employee, and open SEP-IRAs at a bank or brokerage to receive the contributions.
Roughly 28% of small-business owners offer a retirement plan, and SEP-IRAs are the most common choice for firms with fewer than 25 workers, according to data summarized in the Bureau of Labor Statistics National Compensation Survey. Filling out Form 5305-SEP correctly protects your deduction, keeps the plan inside Internal Revenue Code Section 408(k), and prevents costly disqualification.
- 📝 Line-by-line walkthrough of every box, blank, and signature line on Form 5305-SEP
- 💰 The exact 2025 and 2026 contribution caps, compensation limits, and Roth SEP rules under SECURE 2.0
- 👥 Three named real-world examples covering a sole proprietor, an S-corp owner, and a multi-employee LLC
- ⚠️ Seven costly mistakes that trigger plan disqualification, excise taxes, and IRS penalties
- 📅 Deadlines, eligibility tests, and the documents you must give every employee
What Form 5305-SEP Really Is
Form 5305-SEP is the IRS-issued model plan document that creates a Simplified Employee Pension under IRC §408(k). When you sign the form, you agree to make discretionary employer contributions to traditional IRAs that you set up for yourself and every eligible employee. The plan is “simplified” because there is no annual Form 5500 filing, no nondiscrimination testing under §401(a)(4), and no top-heavy testing under §416.
The form is only one page, but it carries serious legal weight. By signing, the employer adopts a written plan that satisfies the documentation rule in Treas. Reg. §1.408-7. Without a signed plan document, the IRS treats every contribution as an excess IRA contribution subject to a 6% excise tax under IRC §4973, repeated every year the excess remains.
A common misconception is that you mail Form 5305-SEP to the IRS. You do not. The official IRS instructions say to keep the signed form in your business records and provide a copy to each eligible employee, along with a written notice of the plan’s terms. Mailing it changes nothing, and the IRS will not stamp or return it.
Who Can Use the Model Form
Most small employers can use Form 5305-SEP, including sole proprietors, partnerships, LLCs, S-corporations, and C-corporations. Self-employed people with no employees, often called solopreneurs, are the largest user group. The IRS Retirement Plans Navigator groups SEPs with SIMPLE IRAs as the easiest plans to launch.
You cannot use Form 5305-SEP if you already maintain another qualified retirement plan, if you use the services of leased employees described in IRC §414(n), or if you are a member of an affiliated service group, controlled group, or trade-or-business under common control unless every eligible employee in every related entity also participates. Violating this rule disqualifies the plan and triggers retroactive taxation of every contribution.
A real-world example helps: Maria, a freelance graphic designer with no employees, can adopt Form 5305-SEP today. David, who owns a dental practice with a 401(k) for staff, cannot use 5305-SEP because his existing 401(k) blocks it. He would need a prototype SEP or to terminate the 401(k) first.
How It Differs From 5305A-SEP and Prototype SEPs
The IRS publishes two model SEP forms. Form 5305-SEP creates a standard employer-funded SEP. Form 5305A-SEP creates a Salary Reduction SEP (SARSEP), but new SARSEPs have been banned since January 1, 1997, under the Small Business Job Protection Act of 1996. Only SARSEPs established before that date may keep accepting employee deferrals.
A prototype SEP is a custom plan document drafted by a financial institution or attorney. Prototypes allow features the model form forbids, such as integration with Social Security under IRC §401(l), more restrictive eligibility, or coordination with another plan. The trade-off is cost and complexity, since prototypes need IRS opinion letters and periodic restatements.
The consequence of choosing the wrong document is significant. If Lakshmi, an S-corp owner, uses Form 5305-SEP but also runs a SIMPLE IRA, both plans become disqualified, every contribution becomes taxable, and she owes the 6% excise tax until she fixes the error through the Employee Plans Compliance Resolution System.
Line-by-Line Instructions for Form 5305-SEP
The form has a header block, three numbered articles with checkboxes and fill-ins, an employer signature line, and a “Questions” section employees can use. Every blank matters. Leaving one empty voids the document under Treas. Reg. §1.408-7(b).
Header: Employer Name and Identifying Information
At the top, write the legal name of the business exactly as it appears on the most recent Form SS-4 EIN confirmation. For a sole proprietor with no EIN, use the owner’s legal name and Social Security number, although the IRS strongly recommends getting an EIN for any plan sponsor.
The header also asks for the date the plan is adopted. This date controls the first plan year. The plan year always runs on a calendar basis under the model form, even if the business uses a fiscal year for income tax purposes. The consequence of a wrong adoption date is that contributions made before the stated date are excess contributions.
A common misconception is that the adoption date can be any date the owner picks. The SECURE Act §201 lets employers adopt a SEP as late as the due date of the return, including extensions, for the year contributions are made. So for tax-year 2025, Carlos, a sole proprietor on extension, may sign Form 5305-SEP as late as October 15, 2026, and still deduct his 2025 contribution.
Article I: Eligibility Requirements
Article I has three age and service blanks. The most generous setting is age 21, three of the immediately preceding five years of service, and $750 of compensation in the current year (the 2025 indexed amount under Notice 2024-80). You may choose a lower age, fewer years, or less compensation, but never a higher threshold.
The “three of five” service rule is unusual. Any service in any part of a year counts as a full year. So an employee hired in November 2022 who works one day in 2022, 2023, 2024, 2025, and 2026 has five years of service and must be covered in 2026. Failing to count partial years is the single most common audit finding in SEP exams, according to the IRS Employee Plans Compliance Unit.
A real-world example: Jordan owns a landscaping LLC and hires seasonal workers each summer. If he sets the service requirement at “1 year,” every seasonal worker who returns for a single day across multiple summers becomes eligible. Setting the requirement at “3 of the immediately preceding 5 years” is almost always the right answer for seasonal businesses, because it delays eligibility while still meeting the law.
Article II: SEP Requirements
Article II is a series of statements the employer adopts by signing. It locks in that contributions go to traditional IRAs, that the employee owns 100% of the contribution immediately under the vesting rule of IRC §408(k)(4), and that contributions follow a written allocation formula.
The model form requires a uniform allocation. Every eligible employee, including the owner, must receive the same percentage of compensation. For 2025 the maximum is 25% of compensation up to the §401(a)(17) compensation cap of $350,000, capped overall at $70,000 per participant under §415(c). For 2026 those numbers are indexed; consult the annual COLA notice.
The consequence of a non-uniform allocation is plan disqualification. If Priya contributes 25% of her own pay but only 10% to her assistant’s pay, the entire SEP becomes a series of excess IRA contributions. She would owe income tax on the excess, the 6% excise tax under §4973, and possibly the 10% early-withdrawal penalty under §72(t) if she removes the money before age 59½.
Article III: Top-Heavy and Other Rules
Article III states the plan is treated as top-heavy under IRC §416 for any year a key employee receives a contribution. Because the uniform allocation already gives every participant the same percentage, the top-heavy minimum is automatically satisfied, so this article almost never causes problems.
Article III also confirms that the employer will not condition contributions on whether the employee keeps the money in the SEP-IRA. The employee may roll the contribution to another IRA the day it is deposited. Trying to restrict withdrawals violates the immediate vesting rule and disqualifies the plan.
A common misconception is that the employer controls the SEP-IRA after deposit. The IRS SEP Plan FAQs make clear the employee owns the account immediately and may invest, withdraw, or roll over the funds at will. The only consequence to the employee is that withdrawals are taxable income and may carry the 10% early-distribution penalty.
Employer Signature, Title, Date
The signature block at the bottom must be signed by an officer or owner with authority to bind the business. For a sole proprietorship, the owner signs. For a corporation, a corporate officer signs. For a partnership or LLC, a managing partner or member signs. An unsigned form is not a plan, and any contribution made before the signature date is an excess IRA contribution.
The date on the signature line is the adoption date and controls when the plan exists. Backdating is fraud and can trigger criminal penalties under IRC §7206. A late but truthful date is fine, as long as it falls on or before the tax-return due date including extensions.
A real-world example: Aisha, the managing member of a two-member LLC, signs Form 5305-SEP on April 1, 2026, with an adoption date of April 1, 2026. She may fund the SEP for tax-year 2025 because the LLC’s partnership return on extension is not due until September 15, 2026. The deduction flows through to the members on Schedule K-1.
Three Named Examples That Show the Form in Action
Concrete examples make the rules click. The three scenarios below mirror the most common SEP setups based on the latest IRS Statistics of Income retirement plan data.
Example 1: Maria, a Freelance Designer (Sole Proprietor)
Maria reports $120,000 of net self-employment income on Schedule C for 2025. After the deductible half of self-employment tax, her plan compensation is roughly $111,520. The maximum SEP contribution for a self-employed person is 20% of net SE earnings (not 25%, because the deduction is circular), per Worksheet 1 in IRS Publication 560.
Maria’s 2025 contribution is about $22,304. She signs Form 5305-SEP on April 10, 2026, opens a SEP-IRA at a brokerage, and deposits the contribution before her April 15 deadline. She deducts the contribution on Schedule 1, line 16.
Example 2: David, S-Corp Dentist With No Staff
David owns a single-shareholder S-corp dental practice with no employees. He pays himself $200,000 of W-2 wages in 2025. Because he is paid on a W-2, the full 25% rate applies. His maximum SEP contribution is $50,000.
The corporation, not David personally, makes and deducts the contribution on Form 1120-S, line 17. David receives the contribution in his SEP-IRA. He signs Form 5305-SEP as corporate president and keeps it in the corporate minute book.
Example 3: Jordan’s Landscaping LLC With Three Employees
Jordan’s LLC files Form 1065 and has three eligible W-2 employees plus Jordan as a working partner. Jordan picks “age 21, 3 of 5 years, $750 compensation” on Article I. He chooses a 10% uniform allocation for 2025.
If the three employees earn $40,000, $55,000, and $70,000, contributions are $4,000, $5,500, and $7,000. Jordan’s own contribution is 10% of his net SE earnings after the SE-tax adjustment. The plan stays uniform, fully deductible, and audit-proof.
Three Real-World Scenarios
The table below shows the most common SEP setup decisions and what each one triggers.
| Decision the Employer Makes | Direct Consequence Under the Tax Code |
|---|---|
| Adopting Form 5305-SEP while a SIMPLE IRA is in place | Plan disqualification, every contribution becomes taxable, 6% excise tax under §4973 |
| Setting service requirement at 0 years to be generous | Every part-time and seasonal worker becomes eligible immediately, payroll cost rises |
| Skipping the written notice to employees | Plan loses model status, IRS may require Form 5500 and prototype document |
| Funding Choice | Tax Outcome |
|---|---|
| Owner contributes 25% to self, 5% to staff | Non-uniform allocation, disqualification, retroactive tax on all contributions |
| Owner contributes equal 15% to self and all eligible staff | Fully deductible, no testing, contributions excluded from W-2 wages |
| Owner contributes after the extended return due date | Contribution counts for the next tax year, no current-year deduction |
| Employee Action | Result for the Employee |
|---|---|
| Rolls SEP-IRA to a Roth IRA in the same year | Conversion is taxable income, no 10% penalty, must file Form 8606 |
| Withdraws SEP funds at age 45 | Ordinary income tax plus 10% early-distribution penalty under §72(t) |
| Leaves the contribution in the SEP-IRA until age 73 | Required minimum distributions begin under SECURE 2.0 §107 |
Contribution Limits, Deadlines, and Roth SEP Rules
Annual SEP limits are indexed each fall by the IRS. For 2025, the limits in Notice 2024-80 are 25% of compensation, $70,000 maximum, and a $350,000 compensation cap. For 2026, the updated COLA notice raises each figure modestly for inflation.
Contributions must be deposited by the due date of the employer’s return, including extensions. A C-corp on extension has until October 15. A sole proprietor on extension has until October 15. A partnership or S-corp on extension has until September 15. Missing this date pushes the contribution into the following tax year and forfeits the deduction for the year you wanted.
SECURE 2.0 §601 added Roth SEP contributions effective for tax years beginning after December 31, 2022. A Roth SEP contribution is not deductible by the employer, is included in the employee’s W-2 wages, and grows tax-free. The model Form 5305-SEP does not yet have a Roth checkbox, so employers wanting Roth SEP contributions must use a prototype document or wait for the IRS to revise the form, as confirmed in IRS Notice 2024-2.
State-Level Nuances
Most states follow federal SEP rules, but a few do not. Pennsylvania taxes employee SEP contributions for state income tax purposes even though they are federally pretax for self-employed people, per the PA-40 instructions. New Jersey does not allow a deduction for IRA contributions on the NJ-1040, so a self-employed New Jersey resident gets the federal deduction but not the state deduction.
California generally conforms to federal SEP treatment but applies an additional 2.5% early-distribution penalty on top of the federal 10% under California R&TC §17085. The consequence is that an early SEP-IRA withdrawal in California can cost 12.5% in penalties on top of ordinary income tax at both federal and state levels.
A common misconception is that state-mandated retirement programs like CalSavers or Illinois Secure Choice exempt employers who adopt a SEP. They do, but only if the SEP covers all eligible employees and the employer registers the exemption with the state, per the CalSavers employer FAQ.
Mistakes to Avoid
Avoid these errors at all costs, because each one carries a specific negative outcome.
- Forgetting to give every eligible employee a copy of the signed Form 5305-SEP and the written disclosure required by Treas. Reg. §1.408-7(d), which causes the plan to lose model status.
- Excluding part-time, seasonal, or returning employees who have worked any portion of three of the last five years, which triggers a VCP filing and corrective contributions plus earnings.
- Allocating different percentages to the owner and the staff, which violates the uniform allocation rule and disqualifies every contribution made that year.
- Funding the SEP after the extended return due date, which moves the contribution to the next year and forfeits the current-year deduction.
- Maintaining a 401(k), SIMPLE IRA, or another qualified plan at the same time, which the model form forbids and which causes retroactive disqualification.
- Trying to make Roth contributions on the standard Form 5305-SEP, which the form does not authorize and which creates excess IRA contributions taxed at 6% per year.
- Backdating the adoption date on the signature line to capture an earlier tax year, which is tax fraud under IRC §7206 and can carry criminal penalties.
Do’s and Don’ts of Form 5305-SEP
Use the do’s and don’ts below to keep your SEP audit-proof.
- Do deliver a complete plan packet to every eligible employee within 30 days of adoption, because the model form notice rule requires written disclosure.
- Do open SEP-IRAs at a single custodian for administrative simplicity, because mixed custodians make uniform-allocation testing harder.
- Do keep the signed form for at least the longer of plan termination plus six years or the period of limitations under IRC §6501, because audits can reach back that far.
- Do check the annual IRS COLA limits every November before computing the next year’s contribution, because the dollar caps change.
-
Do confirm controlled-group status before adopting if you own multiple businesses, because IRC §414(b) and (c) treat related entities as one employer.
-
Don’t condition contributions on continued employment, because the SEP must be 100% vested immediately under §408(k)(4).
- Don’t exclude union employees who are part of a collectively bargained agreement without first checking whether the bargaining unit waives SEP coverage.
- Don’t mix Roth and traditional contributions on the same Form 5305-SEP, because the model form has no Roth election line.
- Don’t assume the SEP avoids state mandates without registering the exemption, because states like California and Oregon require active opt-out filings.
- Don’t delete or alter any printed text on the model form, because Treas. Reg. §1.408-7(b)(2) voids modified model documents.
Pros and Cons of Using Form 5305-SEP
The pros and cons help you decide between the model SEP and a prototype.
- Pro: No annual Form 5500 filing, because DOL Reg. §2520.104-48 exempts SEPs that use the model form.
- Pro: Adoption is free; the IRS PDF costs nothing.
- Pro: Contributions are discretionary, so the employer can skip a year entirely without notice.
- Pro: 100% immediate vesting builds trust with employees and improves retention.
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Pro: A SEP-IRA can be combined with a personal Roth IRA, expanding total retirement savings.
-
Con: Uniform allocation prevents tilting contributions to owners, which limits planning flexibility.
- Con: No Roth option on the model form, so SECURE 2.0 Roth SEP contributions need a prototype.
- Con: No catch-up contribution, unlike 401(k) plans which allow age-50 catch-up.
- Con: Employees control the SEP-IRA immediately and can withdraw contributions the next day.
- Con: No loan feature; SEP-IRAs cannot make participant loans under IRC §72(p).
Comparing SEP-IRA, SIMPLE IRA, and Solo 401(k)
| Feature | SEP-IRA via Form 5305-SEP | SIMPLE IRA via Form 5305-SIMPLE | Solo 401(k) |
|---|---|---|---|
| 2025 employee deferral limit | $0 (employer-only) | $16,500 plus $3,500 catch-up | $23,500 plus $7,500 catch-up |
| Employer contribution limit | 25% comp / $70,000 cap | 2% nonelective or 3% match | 25% comp / combined $70,000 |
| Roth contributions | Not on model form | Allowed under SECURE 2.0 §601 | Allowed |
| Annual filing | None | None | Form 5500-EZ at $250,000 assets |
| Loan provision | No | No | Yes, up to 50% / $50,000 |
Recap of Key Rulings and Guidance
The Tax Court has consistently treated unsigned or backdated SEP documents as nonexistent, leading to disallowed deductions. In Hollen v. Commissioner, T.C. Memo 2011-2, the court denied SEP deductions because the taxpayer could not produce a contemporaneously signed plan document.
In Revenue Procedure 2021-30, the IRS expanded the Self-Correction Program to cover most SEP operational failures, including missed eligible employees and non-uniform allocations, without IRS involvement, provided the employer corrects within three years and pays the missed contributions plus earnings.
IRS Notice 2024-2 confirms that until the IRS issues a revised Form 5305-SEP, employers wanting to offer Roth SEP contributions must use a prototype plan document. Adopting Roth language onto the standard form voids the model status of the document.
FAQs
Do I file Form 5305-SEP with the IRS?
No. You sign it, keep the original in your business records, and give a copy to each eligible employee. The IRS does not accept or process the form.
Can a sole proprietor with no employees use Form 5305-SEP?
Yes. A self-employed person with no staff is the most common SEP user and may adopt the model form, contribute up to 20% of net SE earnings, and deduct the amount on Schedule 1.
Does adopting Form 5305-SEP require an EIN?
Yes. The IRS strongly recommends an EIN for any plan sponsor, and most SEP-IRA custodians require one before opening accounts, even for sole proprietors.
Can I make Roth contributions on Form 5305-SEP?
No. The current model form does not authorize Roth contributions, so employers wanting Roth SEP must use a prototype plan document until the IRS releases a revised model form.
Is the deadline to adopt a SEP the same as the contribution deadline?
Yes. Under SECURE Act §201, both the adoption and the funding deadlines are the employer’s tax-return due date, including extensions, for the year of contribution.
Do I have to contribute every year?
No. SEP contributions are entirely discretionary; the employer may skip any year, contribute a small amount, or contribute the maximum, with no advance notice required to employees.
Can I exclude part-time or seasonal employees?
No. If a worker meets the age, service, and compensation thresholds you select on Article I, you must cover them, even if they work only one day per year.
Are SEP contributions subject to FICA and FUTA?
No. Employer SEP contributions are excluded from wages for federal income tax, FICA, and FUTA, per IRC §3121(a)(5)(C).
Can I have a SEP and a traditional IRA at the same time?
Yes. A SEP-IRA does not affect your personal traditional or Roth IRA contribution limit, although high income may phase out the personal traditional-IRA deduction.
Does a SEP affect my ability to do a backdoor Roth?
Yes. SEP-IRA balances count in the pro-rata rule under §408(d), which can make backdoor Roth conversions partly taxable.
Can I terminate a SEP?
Yes. The employer simply stops contributing and notifies employees in writing; no IRS filing is required, but the existing SEP-IRA accounts remain owned by employees.
Is there a startup tax credit for adopting a SEP?
Yes. Eligible small employers may claim up to $5,000 per year for three years under IRC §45E, as expanded by SECURE 2.0 §102.
Related reading
- Can You Really Have a SEP IRA and a 401(k)? – Avoid This Mistake + FAQs
- Are SEP IRA Contributions Tax-Deductible? + FAQs
- Which Retirement Plan Is Best for Self Employed? (w/Examples) + FAQs
- How to Fill Out IRS Form 5304-SIMPLE (w/Examples) + FAQs
- How to Fill Out IRS Form 5305-SIMPLE (w/Examples) + FAQs
- Can Self-Employed Savers Do a Backdoor Roth? (w/Examples) + FAQs
- How to Fill Out IRS Form 8300 (w/Examples) + FAQs