ERISA and Retirement Plans for Small Business Owners: What You Need to Know

Offering a retirement plan is one of the most powerful tools a small business owner has for attracting and retaining talented employees. But retirement plans come with a web of federal legal obligations under the Employee Retirement Income Security Act of 1974 — commonly known as ERISA. Failing to understand and comply with ERISA can expose your business to significant penalties, IRS audits, and employee lawsuits. This guide breaks down what small business owners need to know about ERISA, how to choose the right retirement plan, and how to fulfill your legal duties as a plan sponsor.

What Is ERISA and Who Does It Cover?

ERISA is the federal law that governs most private-sector employer-sponsored retirement and welfare benefit plans. It sets minimum standards for plan participation, vesting, benefit accrual, funding, and administration. ERISA is enforced jointly by the Department of Labor (DOL), the Internal Revenue Service (IRS), and the Pension Benefit Guaranty Corporation (PBGC).

ERISA applies to most private employers — including small businesses — that sponsor retirement plans such as 401(k) plans, defined benefit pension plans, profit-sharing plans, and certain other arrangements. Some plans are exempt from ERISA’s requirements, including plans maintained by government entities, churches, and plans covering only sole proprietors or partners with no common-law employees.

Common Retirement Plan Options for Small Businesses

Small business owners have several retirement plan options, each with different contribution limits, administrative requirements, and ERISA implications. Choosing the right plan depends on your business size, cash flow, and goals for both you and your employees.

SEP IRA (Simplified Employee Pension)

A SEP IRA allows employers to contribute up to 25% of each eligible employee’s compensation (up to the annual IRS limit, which is $69,000 for 2024). Contributions are discretionary — you can vary them year to year or skip them entirely. SEP IRAs are easy to set up and have minimal administrative requirements. However, all eligible employees must receive the same percentage contribution, which can be costly if you have many employees. SEP IRAs are largely exempt from ERISA’s more complex requirements, making them attractive for very small businesses.

SIMPLE IRA (Savings Incentive Match Plan for Employees)

A SIMPLE IRA is available to businesses with 100 or fewer employees. Employees can contribute up to $16,000 per year (2024 limit), with a catch-up contribution for those 50 and older. Employers must either match employee contributions dollar-for-dollar up to 3% of compensation or make a flat 2% contribution for all eligible employees. SIMPLE IRAs are subject to some ERISA requirements, but the administrative burden is lower than a full 401(k) plan.

401(k) Plans

A 401(k) plan allows employees to make elective deferrals from their paycheck on a pre-tax or Roth basis, up to $23,000 per year (2024), with an additional $7,500 catch-up for those 50 and older. Employers can also make matching or profit-sharing contributions. 401(k) plans are subject to the full range of ERISA requirements, including annual Form 5500 filings, nondiscrimination testing, and detailed participant disclosures. Safe harbor 401(k) plans can simplify compliance by automatically satisfying certain nondiscrimination tests in exchange for mandatory employer contributions.

Solo 401(k)

A solo 401(k), also called an individual 401(k), is designed for self-employed individuals and business owners with no employees other than a spouse. It allows the highest contribution limits of any plan — up to $69,000 per year (2024) when combining employee deferrals and employer contributions. Solo 401(k) plans are generally exempt from ERISA’s Title I requirements because they cover no common-law employees, though they remain subject to IRS rules.

Defined Benefit Plans

Defined benefit plans promise a specified monthly benefit at retirement, based on a formula involving salary and years of service. They allow very high contribution limits — potentially hundreds of thousands of dollars per year — making them attractive for older, high-earning business owners who want to accelerate retirement savings. However, they require annual actuarial calculations, PBGC insurance premiums, and strict ERISA compliance, making them administratively complex and expensive.

Your Fiduciary Duties as a Plan Sponsor

If you sponsor a retirement plan subject to ERISA, you are a plan fiduciary — one of the most significant legal roles in employee benefits law. ERISA imposes strict fiduciary duties on plan sponsors, trustees, and administrators. Breach of fiduciary duty can result in personal liability, requiring you to restore losses to the plan out of your own pocket.

The Duty of Loyalty

You must act solely in the interest of plan participants and beneficiaries — not in your own interest or the interest of the company. Every decision about the plan must be made with the exclusive purpose of providing benefits to participants and paying reasonable plan expenses.

The Duty of Prudence

You must act with the care, skill, prudence, and diligence that a knowledgeable person familiar with such matters would use. This includes prudently selecting and monitoring investment options, evaluating plan fees, and making informed decisions about plan administration. Courts apply an objective standard — it is not enough that you acted in good faith. You must document your decision-making process.

The Duty to Diversify

ERISA requires that plan investments be diversified to minimize the risk of large losses. Unless it is clearly prudent not to diversify, plan assets should be spread across multiple investment options and asset classes.

The Duty to Follow Plan Documents

You must administer the plan in accordance with the plan document and summary plan description, unless doing so would violate ERISA. Deviating from plan terms — even with good intentions — can constitute a fiduciary breach.

Prohibited Transactions Under ERISA

ERISA strictly prohibits certain transactions between the plan and parties in interest, including the employer, plan trustees, and plan service providers. Prohibited transactions include:

• Selling, lending, or leasing property between the plan and a party in interest
• Using plan assets for your own benefit or the benefit of the company
• Paying excessive fees to service providers
• Allowing the plan to make loans to the employer
• Receiving kickbacks from plan vendors

Violations can result in excise taxes equal to 15% of the amount involved per year, increasing to 100% if not corrected. In egregious cases, DOL can bring civil or criminal enforcement actions.

Key ERISA Compliance Requirements

Plan Documents

Every ERISA plan must have a written plan document that describes the plan’s terms, eligibility rules, vesting schedule, contribution formulas, and distribution rules. You must also provide employees with a Summary Plan Description (SPD) — a plain-language summary of the plan — within 90 days of when they become a participant. Amendments must be documented and communicated through Summary of Material Modifications (SMMs).

Vesting Schedules

ERISA requires that employer contributions vest on one of two schedules: cliff vesting (100% after three years of service) or graded vesting (20% per year, fully vested after six years). Employee elective deferrals are always 100% vested immediately. Vesting schedules affect how much departing employees keep — and misapplying them can create significant liability.

Annual Reporting — Form 5500

Most retirement plans must file an annual Form 5500 with the DOL and IRS. Plans with fewer than 100 participants at the beginning of the plan year may file the simplified Form 5500-SF. Solo 401(k) plans with assets under $250,000 are generally exempt from the annual filing requirement. The filing deadline is the last day of the seventh month after the plan year ends (July 31 for calendar-year plans), with a 2.5-month extension available.

Nondiscrimination Testing

401(k) plans must pass annual nondiscrimination tests — the Actual Deferral Percentage (ADP) test and the Actual Contribution Percentage (ACP) test — to ensure highly compensated employees are not contributing disproportionately more than non-highly compensated employees. Failing these tests requires corrective distributions or employer contributions. Safe harbor 401(k) plans sidestep these tests by meeting specific employer contribution requirements.

Timely Deposit of Employee Contributions

One of the most commonly violated ERISA requirements is the timely remittance of employee deferrals. ERISA requires that employee contributions be deposited to the plan as soon as they can reasonably be segregated from company assets — which the DOL interprets as no longer than the 15th business day of the following month for small plans. In practice, the DOL expects contributions within a few days of payroll. Late deposits are prohibited transactions and must be corrected through the DOL’s Voluntary Fiduciary Correction Program (VFCP), including payment of lost earnings.

SECURE 2.0 Act: Recent Changes Affecting Small Business Plans

The SECURE 2.0 Act, signed into law in December 2022, made sweeping changes to retirement plan rules that are particularly beneficial for small businesses:

• Automatic enrollment: New 401(k) and 403(b) plans established after December 29, 2022 must automatically enroll eligible employees at a contribution rate between 3% and 10%, automatically escalating each year
• Small business tax credits: The startup tax credit for new plans was expanded — eligible employers with up to 50 employees can claim 100% of qualified startup costs (up to $5,000 per year for three years), plus an additional credit for employer contributions
• Emergency savings accounts: Employers can offer linked emergency savings accounts alongside retirement plans
• Student loan matching: Employers can treat employee student loan payments as elective deferrals for purposes of employer matching contributions
• Increased catch-up contributions: Employees ages 60-63 can make additional catch-up contributions starting in 2025
• Part-time employee eligibility: Long-term part-time employees must be offered 401(k) participation after two years of service (down from three)

Common ERISA Mistakes Small Business Owners Make

The DOL’s audit and enforcement programs regularly identify the same compliance failures across small business retirement plans. Avoid these common pitfalls:

• Late deposit of employee deferrals — the most frequently cited ERISA violation
• Failing to follow the plan document terms (e.g., using wrong eligibility rules or vesting schedule)
• Not providing required participant disclosures (SPD, fee disclosures, annual notices)
• Missing Form 5500 filing deadlines — penalties start at $250 per day, up to $150,000
• Failing to include all eligible employees in the plan
• Not conducting required nondiscrimination testing or correcting failures timely
• Selecting investments without documentation of a prudent process
• Paying plan expenses with plan assets without authorization in the plan document

Self-Correction and Voluntary Compliance Programs

If you discover a compliance error, the IRS and DOL offer correction programs that allow you to fix mistakes and avoid maximum penalties. The IRS Employee Plans Compliance Resolution System (EPCRS) allows plan sponsors to self-correct certain operational failures without filing with the IRS, or to apply for IRS approval of corrections under the Voluntary Correction Program (VCP). The DOL’s VFCP allows plan sponsors to self-report and correct specific prohibited transactions, including late contributions, and obtain a no-action letter from the DOL.

Early detection and prompt correction are key. If the DOL audits your plan and finds violations you could have self-corrected, the penalties are significantly higher than if you had proactively used the correction programs.

When to Hire a Third-Party Administrator

Most small business owners should not try to administer a 401(k) plan entirely on their own. A third-party administrator (TPA) can handle plan design, nondiscrimination testing, Form 5500 preparation, participant notices, and recordkeeping. While a TPA reduces your administrative burden, it does not eliminate your fiduciary responsibility — you remain personally liable for oversight of the TPA and for decisions made on behalf of the plan.

When hiring a TPA or other plan service provider, document the selection process, review fees carefully, and ensure you have a written service agreement. Periodically benchmark fees and services against market rates — this is part of your fiduciary duty to ensure the plan pays only reasonable expenses.

Practical Steps to Strengthen Your Plan’s Legal Compliance

• Review your plan document annually to confirm it reflects current operations and is up to date with law changes
• Establish a written investment policy statement and document all investment decisions
• Create a payroll calendar that ensures employee contributions are deposited within three business days of payroll
• Set a reminder for Form 5500 filing — mark July 31 (or your plan year-end equivalent) on your calendar
• Conduct an annual review of plan fees paid to all service providers
• Provide all required participant notices — including the annual safe harbor notice if applicable — on time
• Hold fiduciary committee meetings and document decisions with written minutes
• Consult an ERISA attorney before making any plan amendments or significant changes

Conclusion

A well-run retirement plan is a tremendous asset for your business — helping you attract top employees, reduce taxes, and build your own financial security. But ERISA’s requirements are demanding, and the consequences of getting them wrong can be severe. By understanding the basics — fiduciary duties, prohibited transactions, filing deadlines, and employee rights — and by working with experienced plan administrators and legal counsel, small business owners can offer competitive retirement benefits while staying fully on the right side of the law.