IRS Publication 3998 – IRS Forms, Instructions, Pubs 2026 – As a small business owner, planning for retirement isn’t just about securing your own future—it’s also a powerful tool for attracting and retaining talent while enjoying significant tax advantages. IRS Publication 3998, “Choosing a Retirement Solution for Your Small Business,” serves as an essential guide to help you navigate these options. This joint publication from the IRS and the U.S. Department of Labor outlines various retirement plans tailored for small entities, including self-employed individuals. While the core document dates back to November 2020, we’ve incorporated the latest 2026 contribution limits and updates from IRS Notice 2025-67 to ensure this article provides current, actionable advice.
In 2026, retirement plan limits have increased due to cost-of-living adjustments, allowing for higher contributions and greater tax-deferred growth. For example, the elective deferral limit for 401(k) plans rises to $24,500, with enhanced catch-up contributions for those aged 50 and older. Additionally, SECURE 2.0 Act enhancements offer expanded tax credits for small businesses starting plans, making it more affordable than ever. This article breaks down the key plans from Publication 3998, updated for 2026, to help you choose the best retirement solution for your small business.
Why Offer a Retirement Plan for Your Small Business?
Retirement plans provide tax benefits for both employers and employees, including deductible contributions, tax-deferred earnings, and potential tax credits. According to IRS guidelines, these plans can help secure your retirement while boosting employee satisfaction. For small businesses, options range from simple IRA-based plans to more complex 401(k) structures. Key incentives include:
- Tax Credits for Setup: Small employers (50 or fewer employees) can claim up to 100% of qualified startup costs, capped at $5,000 per year for the first three years— a significant jump from the pre-SECURE 2.0 limit of 50% up to $500.
- Saver’s Credit: Low- and moderate-income employees (including self-employed owners) may qualify for a credit of up to 50% on the first $2,000 of contributions.
- Roth Options: Many plans allow after-tax Roth contributions for tax-free qualified withdrawals.
Most plans require immediate vesting for employee contributions, and withdrawals are generally taxed with penalties for early distributions before age 59½.
IRA-Based Retirement Plans for Small Businesses
IRA-based plans are among the simplest options, ideal for very small businesses or self-employed individuals. They involve low setup costs and minimal administrative burdens.
Payroll Deduction IRA
This is the easiest plan to implement, functioning like a traditional or Roth IRA but funded via payroll deductions.
- Eligibility: Any size business; no minimum employee requirements.
- Contributions (2026): Employees contribute up to $7,500 ($8,600 if age 50+). Employers handle deductions but make no contributions.
- Setup and Maintenance: No IRS filings; use a financial institution to manage IRAs. Low cost.
- Benefits: Promotes employee savings; tax-deductible for employees. No loans; withdrawals taxed with potential penalties.
- Best For: Businesses wanting a hands-off approach without employer funding.
Simplified Employee Pension (SEP) IRA
A SEP IRA allows flexible, employer-only contributions, making it popular for variable-income businesses.
- Eligibility: Any business, including self-employed; must cover eligible employees (age 21+, $800+ compensation in 2026).
- Contributions (2026): Employer contributes up to 25% of compensation or $72,000 (whichever is less). Discretionary annually; no employee contributions.
- Setup and Maintenance: Use IRS Form 5305-SEP; no annual filings. Low admin fees.
- Benefits: High limits; fully deductible for employers. Withdrawals taxed; no loans.
- Best For: Solo owners or small teams seeking high, flexible contributions.
SIMPLE IRA
Designed for smaller employers, this plan includes employee deferrals with required employer matches.
- Eligibility: Businesses with 100 or fewer employees; no other retirement plans. Employees must have earned $5,000 in prior years.
- Contributions (2026): Employees defer up to $17,000 ($21,000 if age 50-59 or 64+; $22,250 if 60-63). Employer matches 1-3% or contributes 2% nonelective.
- Setup and Maintenance: Use IRS Forms 5304-SIMPLE or 5305-SIMPLE; financial institution handles most paperwork. No discrimination testing.
- Benefits: Easy for employees to manage post-employment; tax-deferred growth.
- Best For: Businesses with 26-100 employees wanting employee involvement.
Defined Contribution Plans for Small Businesses
These plans base benefits on contributions and investment performance, offering more features like loans but requiring more administration.
Profit-Sharing Plans
Flexible employer contributions based on profits.
- Eligibility: Customizable; often age 21+ with one year of service.
- Contributions (2026): Employer up to $72,000 per participant or 100% of compensation. Deductible up to 25% of total payroll.
- Setup and Maintenance: Prototype plans; annual Form 5500 filing.
- Benefits: Ties contributions to business performance; may allow loans/hardship withdrawals.
- Best For: Businesses with fluctuating profits.
401(k) Plans
The most versatile option, with variations for different needs.
- Traditional 401(k): Employee deferrals up to $24,500 ($32,500 if 50-59 or 64+; $35,750 if 60-63) in 2026. Employer optional matches.
- Safe Harbor 401(k): Mandatory employer contributions (e.g., 3% match) to avoid testing; immediate vesting.
- Automatic Enrollment 401(k): Boosts participation with auto-deductions (opt-out available); exempt from some tests.
- Setup and Maintenance: Pre-approved plans; Form 5500; possible nondiscrimination testing.
- Benefits: High limits; loans/hardships often allowed. Roth options available.
- Best For: Growing businesses aiming to maximize savings.
Solo 401(k) (for Self-Employed)
A one-person 401(k) for owner-only businesses.
- Contributions (2026): Up to $24,500 employee deferral + 25% employer profit-sharing, totaling $72,000 (or more with catch-ups).
- Best For: Solopreneurs or spouses-only teams.
Defined Benefit Plans
For businesses wanting guaranteed payouts, these promise a fixed benefit (e.g., percentage of salary times years of service).
- Eligibility: Custom; actuary determines funding.
- Contributions (2026): Employer-funded; annual benefit up to $290,000.
- Setup and Maintenance: Complex; Form 5500; actuarial services required.
- Benefits: Higher limits for older owners; fixed income in retirement.
- Best For: Established small businesses with stable cash flow.
Comparing Small Business Retirement Plans in 2026
Use this table to compare key features:
| Plan Type | Employer Size | 2026 Employee Contribution Limit | 2026 Employer Contribution | Admin Complexity | Key Advantage |
|---|---|---|---|---|---|
| Payroll Deduction IRA | Any | $7,500 ($8,600 age 50+) | None | Low | Simplest setup |
| SEP IRA | Any | None | Up to $72,000 (25% comp) | Low | Flexible, high limits |
| SIMPLE IRA | ≤100 employees | $17,000 ($21,000/$22,250 catch-up) | Required match (1-3%) or 2% | Medium | Employee deferrals + match |
| Profit-Sharing | Any | None | Up to $72,000 | Medium | Profit-based flexibility |
| 401(k) (Traditional/Safe Harbor) | Any | $24,500 ($32,500/$35,750 catch-up) | Optional/Required for safe harbor | High | Highest deferrals, loans |
| Defined Benefit | Any | None | Actuarial (up to $290,000 benefit) | High | Guaranteed payouts |
Sources: IRS Notice 2025-67 and Publication 3998.
Additional Considerations and Updates for 2026
- Association Retirement Plans (ARPs): Join with other small businesses for cost-sharing; similar to 401(k)s.
- Starter 401(k): New under SECURE 2.0; employee-only deferrals up to $6,000 ($7,100 age 50+); automatic enrollment.
- Tax Reporting: Use Publication 560 for detailed guidelines. Annual Form 5500 for most plans.
- Updates: Limits are adjusted annually; check IRS.gov for changes. SECURE 2.0 also introduces emergency savings accounts linked to plans (up to $2,600 in 2026).
How to Get Started with a Small Business Retirement Plan?
Consult a financial advisor or use IRS pre-approved plans from banks or investment firms. Download Publication 3998 from IRS.gov and review Notice 2025-67 for limits. With enhanced credits, 2026 is an ideal time to implement a plan that benefits your business and team. For personalized advice, visit the IRS Retirement Plans Navigator or DOL resources.