Overview of Retirement Plan Options
Business owners have several retirement plan choices, each with different contribution limits, administrative complexity, and suitability depending on business size and structure.
Types of Plans
1. SEP IRA (Simplified Employee Pension)
Best for: Self-employed individuals, small businesses with few or no employees, businesses with variable income
Key Features:
- Employer contributions only (no employee deferrals)
- 2025 limit: Up to 25% of compensation or $70,000, whichever is less
- For self-employed: 20% of net self-employment income (after deducting half of SE tax)
- Must contribute same percentage for all eligible employees
- Very simple to set up and maintain—minimal paperwork
- No annual filing requirements (no Form 5500)
Employee Eligibility:
- Must include employees who are 21+, earned $750+ in 2024-2025, and worked 3 of last 5 years
- Contributions vest immediately (100%)
When it’s best: High-income solo practitioners or business owners with no employees, or those who want maximum flexibility with minimal administration
2. SIMPLE IRA (Savings Incentive Match Plan for Employees)
Best for: Small businesses (under 100 employees) wanting to offer employee deferrals with minimal cost
Key Features:
- 2025 employee deferral limit: $16,500 ($20,000 if age 50+)
- Employer must either:
- Match employee contributions dollar-for-dollar up to 3% of compensation, OR
- Make non-elective 2% contribution for all eligible employees
- Cannot have any other retirement plan
- Minimal administrative burden
- No Form 5500 required
When it’s best: Smaller businesses that want employees to save but want to keep employer costs predictable and low
3. Solo 401(k) / Individual 401(k)
Best for: Self-employed with no employees (or only spouse as employee)
Key Features:
- 2025 total limit: $70,000 ($77,500 if age 50+)
- Two contribution components:
- Employee deferrals: Up to $23,500 ($31,000 if 50+)
- Employer profit-sharing: Up to 25% of W-2 wages (20% of net SE income)
- Can do Roth contributions
- Can take loans (up to $50,000)
- Must file Form 5500-EZ if assets exceed $250,000
When it’s best: High-income self-employed individuals who want maximum contributions with flexibility
4. Traditional 401(k)
Best for: Growing businesses with employees, companies wanting to attract/retain talent
Key Features:
- 2025 employee deferral: $23,500 ($31,000 if 50+)
- Employer can add matching or profit-sharing contributions
- Total combined limit: $70,000 ($77,500 if 50+)
- Vesting schedules allowed for employer contributions
- Requires annual Form 5500 filing
- Nondiscrimination testing required (ADP/ACP tests)
- More complex administration, typically needs third-party administrator
Matching structures:
- Common: 50% match up to 6% of salary (costs 3% of payroll)
- Generous: 100% match up to 4% (costs 4% of payroll)
- Can add profit-sharing component
When it’s best: Established businesses with employees who want maximum flexibility and can handle administrative complexity
5. Safe Harbor 401(k)
Best for: Businesses with highly compensated employees who want to maximize contributions without testing limits
Key Features:
- Same contribution limits as traditional 401(k)
- Bypasses nondiscrimination testing if employer meets safe harbor requirements:
- 100% match up to 3% + 50% match on next 2% (4% total), OR
- 3% non-elective contribution to all eligible employees, OR
- Enhanced match of 100% up to 4%
- All employer contributions must vest immediately (or 2-year cliff)
- Must notify employees before plan year begins
When it’s best: Owners/highly compensated employees want to max out contributions without worrying about testing failures; worth the guaranteed employer cost
6. Defined Benefit Plan (Pension)
Best for: High-income earners (usually 50+) who want to contribute more than 401(k) limits allow
Key Features:
- Can contribute $100,000-$300,000+ annually depending on age and income
- Contribution calculated by actuary based on age, income, and desired retirement benefit
- Complex and expensive to administer ($2,000-$5,000+ annually)
- Required annual contributions
- Must cover employees proportionally
When it’s best: Older, high-income professionals (doctors, lawyers, consultants) who are behind on retirement savings and have stable, high income
Tax Savings Examples
Example 1: Solo Business Owner (No Employees)
Profile: Self-employed consultant, age 45, net self-employment income $200,000
Without retirement plan:
- Taxable income: ~$200,000
- Federal tax (24% bracket + SE tax): ~$61,000
With Solo 401(k):
- Employee deferral: $23,500
- Employer contribution: ~$37,000 (20% of net SE income after deferrals)
- Total contribution: $60,500
- Tax savings: ~$18,000 (federal only)
- Cost to business: $37,000 employer portion (employee portion comes from salary deferrals)
Example 2: Small Business with 5 Employees
Profile: S-Corp owner taking $150,000 salary, 5 employees averaging $50,000 salary
Option A: Traditional 401(k) with 3% match
- Owner contributes: $23,500 employee + $37,500 employer = $61,000
- Owner’s cost: $37,500
- Employee match cost (if all participate): $7,500 (3% × $250,000 total payroll)
- Total employer cost: $45,000
- Owner’s tax savings: ~$18,300
Option B: Safe Harbor 401(k) (4% total match)
- Owner contributes: $23,500 employee + $37,500 employer = $61,000
- Required employer contributions: $16,000 (4% × $400,000 total payroll including owner)
- Owner’s tax savings: ~$18,300
- No testing headaches
Option C: SEP IRA
- Must contribute same percentage for all
- To max out owner: 25% of $150,000 = $37,500
- Employee cost: 25% × $250,000 = $62,500
- Total employer cost: $100,000
- Too expensive with employees!
Example 3: High-Income Professional Nearing Retirement
Profile: 55-year-old attorney, $400,000 income, 2 staff members
Solo 401(k) or Safe Harbor 401(k):
- Maximum: $77,500 (with catch-up)
- Tax savings: ~$30,000
Defined Benefit Plan (combined with 401(k)):
- Could contribute: $200,000-$250,000 annually
- Tax savings: ~$80,000-$100,000
- Administration costs: $5,000/year
- Must continue for several years
- Best if planning to retire in 10-15 years
Plan Administration and Fund Transfers
Setting Up the Plan
- Choose provider: Fidelity, Vanguard, Charles Schwab, Guideline, Human Interest, ADP, Paychex
- Adopt plan document: Provider typically supplies
- Create trust: Retirement funds must be held in trust separate from business assets
- Obtain EIN: Plan needs its own tax ID number
- Set up payroll deductions: Integrate with payroll system
How Funds Are Transferred
Employee deferrals:
- Deducted from each paycheck (pre-tax)
- Must be deposited to plan within 7 business days of payday (for businesses with <100 employees)
- Sent via ACH or wire to plan custodian
- Allocated to employee accounts
Employer contributions:
- Can be made throughout year or as lump sum
- Matching: typically deposited each pay period
- Profit-sharing: often made annually by tax filing deadline (including extensions)
- Business writes check or transfers funds to plan trust
Paycheck Stub Information
Employees will see:
- Current period: “401k Def” or “Retirement” showing pre-tax deduction amount
- Year-to-date: Total deferrals for the year
- Possibly: Employer match amount (if contributed per paycheck)
- Taxable wages: Reduced by the deferral amount (shows tax savings)
Example stub line items:
Gross Pay: $4,000.00
401(k) Deferral: – $400.00
Taxable Wages: $3,600.00
Deductions:
401(k) Employee: $400.00
401(k) ER Match: $120.00 (if shown)
YTD:
401(k) Deferrals: $9,200.00
Ongoing Management
Business owner responsibilities:
- Process payroll deferrals timely
- Remit contributions promptly
- Provide participant notices
- File Form 5500 annually (if required)
- Ensure plan compliance
- Monitor plan investments (fiduciary duty)
Third-party administrator (TPA) handles (for complex plans):
- Nondiscrimination testing
- Form 5500 preparation
- Plan document updates
- Compliance monitoring
- Costs: $1,500-$5,000+ annually depending on plan size
Key Considerations for Business Owners
1. Employee Coverage Requirements
Don’t forget: Most plans require covering eligible employees proportionally. A generous owner contribution means proportional employee contributions too.
2. Cash Flow Considerations
- Safe Harbor and SIMPLE IRA require mandatory employer contributions
- Traditional 401(k) allows discretionary profit-sharing
- Consider business cash flow volatility
3. Administrative Burden
Complexity ranking (simple to complex):
- SEP IRA (easiest)
- SIMPLE IRA
- Solo 401(k)
- Safe Harbor 401(k)
- Traditional 401(k)
- Defined Benefit Plan (most complex)
4. Timing Considerations
- Most plans must be established by December 31 to count for that tax year
- Exception: SEP IRA can be established up until tax filing deadline (including extensions)
- Solo 401(k) can be established by December 31, but employer contributions can be made until tax deadline
5. Highly Compensated Employee (HCE) Issues
If you earn $155,000+ (2025 threshold), traditional 401(k) testing may limit your contributions if rank-and-file employees don’t participate. Safe Harbor solves this.
6. Vesting Schedules
- SEP and SIMPLE: Immediate 100% vesting
- 401(k): Can use graded (2-6 years) or cliff (3 years) vesting for employer contributions
- Vesting reduces cost if employees leave before fully vested
7. Roth Options
- 401(k) plans can offer Roth contributions (post-tax, tax-free growth)
- SEP and SIMPLE cannot be Roth
- Consider if you expect higher tax rates in retirement
8. State Requirements
Some states (California, Illinois, Oregon, etc.) mandate retirement plan access for employees or auto-enrollment in state programs. Check your state requirements.
Decision Framework
Choose SEP IRA if:
- You’re solo or have very few employees
- You want maximum simplicity
- Income varies year to year
- You want flexibility to skip years
Choose SIMPLE IRA if:
- You have employees who want to save
- You want to minimize employer cost (2-3% of payroll)
- You want simplicity with employee participation
Choose Solo 401(k) if:
- You’re self-employed with no employees
- You want maximum contribution potential
- You want loan and Roth options
Choose Safe Harbor 401(k) if:
- You’re a highly compensated owner
- You want to max out without testing worries
- You have employees and can commit to 3-4% employer contribution
- Administrative costs are acceptable
Choose Traditional 401(k) if:
- You want flexibility in employer contributions
- You don’t mind testing and administration
- Employee participation is strong enough to pass testing
Choose Defined Benefit if:
- You’re 50+ with high, stable income
- You want to contribute $100,000+ annually
- You can commit for several years
- Administrative costs are worthwhile
Action Steps
- Calculate potential contribution: Based on your income and age
- Estimate employee costs: If you have employees, calculate required contributions
- Compare tax savings vs. total costs: Include administration fees
- Consult with: CPA (tax implications) and financial advisor (investment strategy)
- Get quotes: Contact 2-3 providers for setup and annual costs
- Decide by timing deadline: Most plans need December 31 establishment
The right plan depends on your unique situation—income level, employee count, administrative tolerance, and long-term business plans. Most small business owners start with SEP IRA or Solo 401(k) when solo, then transition to Safe Harbor 401(k) as they grow and hire employees.
Please note: The tax-related information provided here is for general informational purposes only and should not be construed as specific tax advice, nor does it establish a tax advisor-client relationship. Tax laws are complex, subject to change, and vary based on individual circumstances and jurisdictions. You should consult with a qualified tax professional, certified public accountant, or tax attorney regarding your specific tax situation before making any decisions or taking any actions based on this information and we assume no liability for your use of this information without seeking further consultation for your specific situation.
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