401(k) for Small Business: Setup, Costs & Provider Comparison
Last updated: 2026-03-27
Summary: A 401(k) is the most flexible retirement plan for small businesses but involves more administration than simpler options. For businesses with 5+ employees wanting maximum flexibility, choose a 401(k) or Safe Harbor 401(k). For self-employed individuals, consider a Solo 401(k) or SEP IRA. For businesses with under 100 employees wanting simplicity, a SIMPLE IRA works well. Modern providers like Guideline ($49/mo + $8/employee) and Human Interest ($120/mo + $6/employee) have dramatically reduced costs. SECURE Act 2.0 tax credits offset up to $5,000/year in plan costs for 3 years, making a 401(k) effectively free for eligible small employers.
Which retirement plan is right for your business?
The right plan depends on your business size, budget, and administrative capacity. Here is how the main options compare:
| Plan | Best For | Contribution Limit | Employer Match | Admin Complexity | Vesting |
|---|---|---|---|---|---|
| Traditional 401(k) | Businesses with 5+ employees wanting maximum flexibility | $23,500 employee (2026) + employer match; $70,000 total annual additions limit | Optional; flexible match formulas | High (annual testing, Form 5500) | Employer can set vesting schedule (up to 6 years) |
| Safe Harbor 401(k) | Businesses wanting to avoid annual nondiscrimination testing | $23,500 employee (2026) + required employer contribution; $70,000 total limit | Required: 3% non-elective OR 4% match | Medium (no ADP/ACP testing needed) | Employer contributions must be 100% immediately vested |
| SEP IRA | Self-employed or small business with few employees | 25% of compensation, up to $70,000 (2026) | Employer contributes same % for all employees | Very Low (no Form 5500, no testing) | 100% immediately vested |
| SIMPLE IRA | Businesses with 100 or fewer employees | $16,500 employee (2026) + employer match or contribution | Required: dollar-for-dollar up to 3% OR 2% non-elective | Low (no Form 5500, no testing) | 100% immediately vested |
| Solo 401(k) | Self-employed with no employees (or only a spouse) | $23,500 employee + 25% employer, up to $70,000 total (2026) | You are both employer and employee | Low (Form 5500 if assets exceed $250K) | N/A (your own money) |
What does a 401(k) cost to set up and maintain?
401(k) costs fall into three categories:
- •Setup fees: Most modern providers (Guideline, Human Interest, Betterment) waive setup fees. Traditional providers may charge $500-$2,000. The SECURE 2.0 tax credit offsets these costs.
- •Ongoing administration: Monthly base fees ($49-$150/mo) plus per-employee fees ($4-$10/mo per participant). This covers recordkeeping, compliance testing, Form 5500 filing, and participant support.
- •Investment fees: Fund expense ratios (typically 0.03%-0.50% of assets annually). Low-cost index funds keep this minimal. Beware providers that use high-fee funds or charge asset-based fees that grow as the plan grows.
For a business with 10 employees, typical all-in annual costs range from $1,500 to $5,000 before tax credits. With SECURE 2.0 credits, the effective cost can be near zero for the first 3 years.
How do 401(k) providers compare?
| Provider | Monthly Base | Per Employee | Setup Fee | Best For | Notable |
|---|---|---|---|---|---|
| Guideline | $49/mo base | $8/mo per participant | Free | Small businesses wanting simple, affordable 401(k) | No revenue sharing; flat fees; full admin included |
| Human Interest | $120/mo base | $6/mo per participant | Free | Growing businesses wanting payroll integration | Integrates with most payroll providers; compliance support |
| Vanguard | Varies | 0.20-0.35% of assets | $1,000+ | Larger businesses with $1M+ in plan assets | Lowest-cost index funds; best for larger plans |
| Fidelity | $0 (select plans) | Varies by plan | Varies | Businesses wanting a full-service provider | Extensive investment options; strong participant tools |
| Charles Schwab | Varies | Varies | Varies | Businesses with $1M+ in assets | Wide investment selection; good technology platform |
| Betterment at Work | $75/mo base | $6/mo per participant | Free | Businesses wanting robo-advisor portfolio management | Automated portfolio management; modern interface |
Pricing as of early 2026. Contact providers for current pricing. Fees may vary by plan type and features selected.
What are common employer match strategies?
An employer match is the most powerful incentive to drive participation. Common match formulas include:
Dollar-for-dollar up to 3%
You match every dollar the employee contributes, up to 3% of their salary. If they contribute 3% or more, they get the full match. Simple and popular.
50 cents on the dollar up to 6%
You contribute $0.50 for every $1 the employee contributes, up to 6% of salary. This costs the same as 3% dollar-for-dollar but encourages employees to save more.
Safe Harbor match (100% of first 3% + 50% of next 2%)
This specific formula qualifies as a Safe Harbor contribution, eliminating the need for nondiscrimination testing. Effective match rate is 4% of salary.
3% non-elective (Safe Harbor)
Contribute 3% of salary for all eligible employees, regardless of whether they contribute. Also eliminates testing. Best when participation is low.
Employer match contributions are tax-deductible business expenses and do not count toward the employee's annual deferral limit ($23,500 in 2026). The catch-up contribution limit for employees age 50 and older is an additional $7,500 (2026). Under SECURE 2.0, employees aged 60-63 can contribute an enhanced catch-up of $11,250 (2026), for a total deferral of $34,750.
What SECURE Act 2.0 tax credits are available?
The SECURE 2.0 Act (2022) created generous tax credits that make starting a retirement plan dramatically cheaper for small businesses:
Startup cost credit (Section 45E)
- •Who: Employers with up to 50 employees who start a new plan
- •Amount: 100% of eligible startup costs, up to $5,000 per year
- •Duration: 3 years (up to $15,000 total)
- •Covers admin fees, setup costs, and employee education
Employer contribution credit (Section 45T)
- •Who: Employers with up to 50 employees
- •Amount: Up to $1,000 per employee per year
- •Duration: 5 years (phases down: 100% years 1-2, 75% year 3, 50% year 4, 25% year 5)
- •Excludes employees earning more than $100,000
Other key SECURE 2.0 provisions (2026)
- •Mandatory auto-enrollment: New 401(k) plans established after 12/29/2022 must auto-enroll employees at 3-10% with annual 1% auto-escalation up to at least 10% (max 15%). Exemptions for businesses with 10 or fewer employees, businesses under 3 years old, and SIMPLE/SEP plans.
- •Enhanced catch-up (age 60-63): Starting 2025, employees aged 60-63 can contribute the greater of $10,000 or 150% of the standard catch-up limit (effectively $11,250 in 2026).
- •Roth employer contributions: Employers may now make matching and nonelective contributions to Roth accounts (previously only pre-tax was allowed for employer contributions).
- •Student loan matching: Employers can treat employee student loan payments as elective deferrals for purposes of matching contributions.
- •Emergency savings accounts: Plans may offer a Roth emergency savings account (up to $2,500) linked to the retirement plan.
Frequently asked questions
How much does it cost to set up a 401(k) for a small business?
Modern 401(k) providers like Guideline and Human Interest offer free setup with monthly fees starting at $49-$120 per month plus $6-$8 per participant. Traditional providers like Vanguard, Fidelity, and Schwab may charge setup fees of $500-$2,000+ but offer lower asset-based fees for larger plans. Thanks to SECURE Act 2.0 tax credits, eligible small businesses can offset up to $5,000 per year in startup costs for the first 3 years, making a 401(k) effectively free for many small employers.
What is the SECURE Act 2.0 tax credit for new retirement plans?
The SECURE 2.0 Act provides a tax credit for small employers (up to 50 employees) who start a new retirement plan. The credit covers 100% of administrative costs up to $5,000 per year for the first 3 years (up to $15,000 total). There is also a separate credit of up to $1,000 per employee for employer contributions made during the first 5 years. These credits together can make offering a 401(k) essentially cost-free for small businesses.
Do I have to offer an employer match?
For a traditional 401(k), employer matching is optional. However, offering a match dramatically increases employee participation (typically from 30-40% without a match to 70-80% with one). For a Safe Harbor 401(k) (which avoids nondiscrimination testing), you must either contribute 3% of compensation for all eligible employees regardless of participation, or match 100% of the first 3% plus 50% of the next 2% of employee contributions.
What is the difference between a 401(k) and a SEP IRA?
The main differences: A 401(k) allows employees to make their own pre-tax contributions (employee deferrals), while a SEP IRA only allows employer contributions. A 401(k) is more complex and costly to administer but offers more flexibility and higher total contribution potential. A SEP IRA is dead-simple to set up and administer but requires you to contribute the same percentage for all eligible employees — if you contribute 25% for yourself, you must contribute 25% for every eligible employee.
Which plan should I choose if I'm self-employed with no employees?
A Solo 401(k) is usually the best option. It allows the highest total contributions (up to $70,000 in 2026 as both employer and employee, or $77,500 if age 50+), offers a Roth option, and allows loans from the plan. A SEP IRA is simpler to set up but limits you to 25% of net self-employment income as the employer contribution and does not allow employee deferrals. If you plan to hire employees, consider starting with a SEP IRA (easy to set up) and converting to a 401(k) later.
Are states requiring businesses to offer retirement plans?
Yes, a growing number of states have enacted mandatory retirement savings programs for businesses that do not already offer a plan. States with active mandates include California (CalSavers), Colorado (Colorado SecureSavings), Connecticut (MyCTSavings), Illinois (Illinois Secure Choice), Maine, Maryland, New York, Oregon (OregonSaves), and Virginia. These programs are typically auto-enrollment Roth IRAs, not 401(k)s. If you offer your own 401(k), SEP IRA, or SIMPLE IRA, you are exempt from the state mandate.
What is auto-enrollment and should I use it?
Auto-enrollment automatically enrolls new employees in the 401(k) at a default contribution rate (typically 3-6% of pay) unless they opt out. It dramatically increases participation — from about 40% voluntary enrollment to 90%+ with auto-enrollment. SECURE 2.0 requires auto-enrollment for new 401(k) plans established after December 29, 2022 (with exceptions for businesses with 10 or fewer employees, businesses less than 3 years old, and SIMPLE/SEP plans).
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This is general information, not financial or tax advice. Retirement plan rules are complex and change frequently. Consult a qualified financial advisor and tax professional for advice specific to your business. Sources: IRS, DOL, SECURE 2.0 Act text, provider websites.