As a business owner, planning for your own retirement while supporting your employees’ financial future is a meaningful part of your broader strategy. Two common retirement plan options—SEP IRAs and 401(k) plans—offer valuable tax advantages, but they differ in how contributions work, who is eligible, and the level of administrative responsibility involved.
This guide breaks down the key differences between SEP and 401(k) plans based on the IRS limits for 2026, helping you determine which option aligns best with your business.
SEP Plan Basics
A SEP (Simplified Employee Pension) plan is often used by self-employed individuals and small business owners who want a straightforward, low-administration retirement plan. Under a SEP:
- Only the employer contributes
- Contributions go into each employee’s SEP IRA
- Employees cannot make their own salary deferrals
For businesses without full-time staff—or for owners who want flexibility in contribution amounts—SEPs can be appealing.
401(k) Plan Basics
A 401(k) allows both employee salary deferrals and employer contributions, offering more flexibility than a SEP. Employees can choose to defer a portion of their pay, and employers may choose to match or make non-elective contributions.
This structure often makes 401(k)s a strong option for attracting and retaining employees.
Key Differences Between SEP and 401(k) Plans
Below is a closer look at how contribution rules, eligibility, vesting, and loans differ between the two plans.
Contributions
SEP Plans (2026 IRS limits)
- Only employers can contribute
- Contribution amounts can vary year-to-year
- Employers must contribute the same percentage of compensation for all eligible employees
- Max employer contribution: 25% of compensation or $72,000, whichever is lower
401(k) Plans (2026 IRS limits)
- Both employees and employers can contribute
- Employee deferral limit: $24,500
- Catch-up contribution (age 50+): $8,000
- Total employer + employee contribution limit: $72,000
- Employers may offer matching or profit-sharing contributions
This flexibility is a major advantage for businesses that want to offer competitive benefits.
Eligibility
SEP Plans
Employees are eligible if they:
- Are at least 21
- Worked for the employer in 3 of the past 5 years
- Earned at least $800 in the current year
401(k) Plans
Employers have more control over eligibility rules. Generally, employees must:
- Be 21
- 1,000 hours, plus long-term part-time inclusion rules
Long-term part-time employees who meet federal service requirements must also be allowed to contribute, which expands access and requires ongoing tracking.
Vesting
SEP Plans
- All employer contributions are immediately 100% vested
401(k) Plans
- Employee deferrals are always fully vested
- Employer contributions may follow a vesting schedule, giving employers flexibility in retention planning
Loans
SEP Plans
- Loans are not permitted
- Early withdrawals are generally subject to taxes and penalties
401(k) Plans
- Many plans allow loans up to:
- 50% of vested account balance, up to $50,000
- Loans must be repaid with interest, typically within 1–5 years
For employees who may need short-term liquidity, this can be a meaningful benefit.
Which Plan Is Right for Your Business?
The best plan for your business depends on the size of your workforce, the complexity you’re comfortable managing, and whether you want employees to participate directly in their retirement savings.
SEP Plans may be ideal if you:
- Are self-employed or have few employees
- Prefer a simple, low-administration plan
- Want flexibility in employer contribution amounts
401(k) Plans may be a better fit if you:
- Want employees to make their own contributions
- Want to offer a competitive benefit for hiring and retention
- Need plan features such as Roth contributions, loans, or vesting schedules
Both options offer strong tax benefits, but their structures serve different needs.
Choosing the right retirement plan is an important decision for your business and your long-term financial goals. Whether you’re considering a SEP or a 401(k), understanding the 2026 IRS limits and the structural differences can help you make a confident, informed choice.
If you’re unsure which plan best supports your goals, Navalign Wealth Partners can help you evaluate your options and design a strategy that aligns with your business and your future.