Offering a 401(k) plan is the single most effective way to attract and retain employees — 80% of workers say retirement benefits influence their job decisions. But for small businesses, the 401(k) landscape is confusing: hidden fees, complex compliance requirements, and providers designed for companies with hundreds of employees. The new generation of 401(k) platforms has changed this, offering affordable, transparent plans specifically for businesses with 1–100 employees.
This guide compares the best 401(k) providers for small businesses, from solo entrepreneurs to growing teams.
Best 401(k) Providers at a Glance
| Provider | Best For | Base Fee | Per-Employee Fee | Fund Expense Ratios | Setup |
|---|---|---|---|---|---|
| Guideline | Best overall small biz | $49/mo | $8/employee/mo | 0.03–0.08% | Online |
| Human Interest | Growing companies | $100/mo | $6/employee/mo | 0.03–0.15% | Online |
| Betterment at Work | Managed portfolios | Custom | Custom | 0.03–0.08% + mgmt fee | Online |
| Fidelity | Large small businesses (50+) | Custom | Custom | 0.02–0.08% | Rep-assisted |
| Schwab | Mid-size businesses | Custom | Custom | 0.03–0.08% | Rep-assisted |
| Vanguard | Lowest fund fees | Custom | Custom | 0.03–0.07% | Rep-assisted |
| ADP | Payroll integration | Custom | Custom | Varies (often higher) | Rep-assisted |
| Fidelity (Solo 401k) | Solo operators | $0 | N/A | 0.00–0.08% | Online |
| Schwab (Solo 401k) | Solo operators | $0 | N/A | 0.03–0.08% | Online |
Detailed Reviews
Guideline — Best Overall for Small Business
| Feature | Details |
|---|---|
| Base fee | $49/month |
| Per-employee fee | $8/employee/month |
| Setup fee | $0 |
| Investment menu | Curated low-cost index funds (Vanguard, Schwab) |
| Fund expense ratios | 0.03–0.08% |
| Administration | Full-service (compliance testing, filing, notices) |
| Payroll integration | Gusto, ADP, OnPay, Rippling, and 30+ others |
| Employer dashboard | Yes (online) |
| Employee onboarding | Automated |
Guideline has become the default recommendation for small business 401(k) plans. Transparent pricing ($49/mo + $8/employee), full administration (they handle all compliance, testing, filing, and participant notices), and a curated menu of low-cost index funds make it the easiest path to offering a 401(k). They integrate with 30+ payroll providers for automatic contribution processing. For a 10-employee company, total cost is $129/month ($1,548/year) — far below traditional providers that can charge $3,000–$5,000/year.
Best for: Small businesses with 1–100 employees wanting the simplest, most affordable 401(k)
Human Interest — Best for Growing Companies
| Feature | Details |
|---|---|
| Base fee | $100/month |
| Per-employee fee | $6/employee/month |
| Setup fee | $0 |
| Investment menu | Broad selection (index + target-date + active) |
| Fund expense ratios | 0.03–0.15% |
| Administration | Full-service |
| Payroll integration | 200+ integrations |
| Safe harbor plans | Yes |
| Profit sharing | Yes |
Human Interest charges a higher base fee ($100/mo) but lower per-employee cost ($6/mo), making it more cost-effective for companies with 20+ employees. The investment menu is broader than Guideline’s, and they support more complex plan designs including safe harbor plans, profit sharing, and Roth 401(k). The 200+ payroll integrations ensure compatibility with almost any system.
Best for: Growing companies with 20–100+ employees that may need flexible plan design
Fidelity Solo 401(k) — Best for Self-Employed
| Feature | Details |
|---|---|
| Annual fee | $0 |
| Setup fee | $0 |
| Trading commissions | $0 |
| Investment options | Full Fidelity platform (thousands of funds) |
| Contribution limit | $69,000 (2026), $76,500 if 50+ |
| Roth 401(k) option | Yes |
| Loan feature | Yes |
| Eligibility | Self-employed with no W-2 employees (spouse OK) |
Fidelity’s Solo 401(k) is the gold standard for self-employed individuals. Zero fees, zero commissions, access to Fidelity’s entire investment platform (including zero-expense-ratio index funds), and contribution limits of up to $69,000/year. That’s nearly 10x the Roth IRA limit of $7,000. If you’re self-employed — freelancer, consultant, sole proprietor, LLC — this should be your primary retirement account.
Best for: Self-employed individuals and business owners with no employees (except spouse)
Schwab Solo 401(k) — Best Solo Plan with Banking
| Feature | Details |
|---|---|
| Annual fee | $0 |
| Setup fee | $0 |
| Trading commissions | $0 |
| Investment options | Full Schwab platform |
| Contribution limit | $69,000 (2026), $76,500 if 50+ |
| Roth 401(k) option | Yes |
| Loan feature | Yes (up to $50,000) |
| Banking integration | Schwab Investor Checking |
Schwab’s Solo 401(k) matches Fidelity’s on cost (free) and offers the added benefit of integration with Schwab’s banking and brokerage ecosystem. The loan feature lets you borrow up to $50,000 from your 401(k) if needed. If you already bank and invest with Schwab, keeping your Solo 401(k) there creates a single-platform financial hub.
Best for: Self-employed individuals who want banking + investing + retirement at one company
How Much Does a Small Business 401(k) Cost?
Total Annual Cost by Company Size
| Company Size | Guideline | Human Interest | Traditional Provider | Cost Savings (Guideline vs. Traditional) |
|---|---|---|---|---|
| 5 employees | $1,068 | $1,560 | $2,500–$4,000 | $1,432–$2,932 |
| 10 employees | $1,548 | $1,920 | $3,000–$5,000 | $1,452–$3,452 |
| 25 employees | $2,988 | $3,000 | $5,000–$8,000 | $2,012–$5,012 |
| 50 employees | $5,388 | $4,800 | $8,000–$15,000 | $2,612–$9,612 |
| 100 employees | $10,188 | $8,400 | $12,000–$25,000 | $1,812–$14,812 |
Traditional providers include legacy firms like John Hancock, Principal, and T. Rowe Price. Costs are estimates and vary by plan design.
Hidden Fees to Watch For
| Fee Type | Common Range | Who Charges It | How to Avoid |
|---|---|---|---|
| Asset-based fees | 0.50–1.50%/year of AUM | Legacy providers | Choose flat-rate providers like Guideline |
| Revenue sharing | 0.10–0.50% | Embedded in fund expense ratios | Select plans with institutional index funds |
| Per-transaction fees | $5–$25 per transaction | Some legacy providers | Choose providers with no transaction fees |
| Loan origination fees | $50–$150 | Most providers | Compare loan terms before offering |
| Plan termination fee | $500–$2,000 | Some providers | Check contract before signing |
Asset-based fees are the biggest trap. A provider charging 1.00% of assets on a plan with $500,000 collects $5,000/year — even if the plan only has 10 employees. This fee grows as your plan balance grows, eventually costing far more than flat-rate alternatives.
Solo 401(k) Contribution Limits (2026)
Maximum Solo 401(k) Contribution Calculator
| Net Self-Employment Income | Employee Contribution | Employer Contribution (25% of comp) | Total Maximum |
|---|---|---|---|
| $30,000 | $23,500 | $6,500 | $30,000 |
| $50,000 | $23,500 | $12,500 | $36,000 |
| $75,000 | $23,500 | $18,750 | $42,250 |
| $100,000 | $23,500 | $25,000 | $48,500 |
| $150,000 | $23,500 | $37,500 | $61,000 |
| $200,000+ | $23,500 | $45,500 | $69,000 max |
Add $7,500 catch-up if age 50+. Employer contribution is 25% of net self-employment income (after SE tax deduction).
Solo 401(k) vs. SEP IRA vs. SIMPLE IRA
| Feature | Solo 401(k) | SEP IRA | SIMPLE IRA |
|---|---|---|---|
| Max contribution (2026) | $69,000 | $69,000 | $16,500 |
| Employee contribution | Yes ($23,500) | No | Yes ($16,500) |
| Roth option | Yes | No | No |
| Loan feature | Yes | No | No |
| Allows employees | No (except spouse) | Yes | Yes |
| Tax deduction | Full | Full | Full |
| Admin complexity | Low | Very low | Low |
| Best for | Self-employed, max savings | Self-employed, simplicity | Small employers |
The Solo 401(k) wins for most self-employed people because it allows the highest employee contribution ($23,500 vs. $0 for SEP IRA) and offers both Roth and loan features. SEP IRAs are simpler but cap employer contributions at 25% of compensation with no employee contribution.
Employer Match: Cost and Impact
Cost of Common Match Formulas (10 Employees, $60K Average Salary)
| Match Formula | Annual Cost (10 Employees) | Generosity Level |
|---|---|---|
| 100% of first 3% | $18,000 | Standard |
| 100% of first 3% + 50% of next 2% | $24,000 | Competitive |
| 100% of first 4% | $24,000 | Generous |
| 100% of first 6% | $36,000 | Very generous |
| $0.50 per $1 up to 6% | $18,000 | Budget-friendly |
| No match (safe harbor 3% non-elective) | $18,000 | Simplest compliance |
Safe Harbor Plans: Skip Compliance Testing
Safe harbor plans automatically pass non-discrimination testing by meeting one of these formulas:
| Safe Harbor Type | Employer Contribution | Vesting | Benefit |
|---|---|---|---|
| Basic match | 100% of first 3% + 50% of next 2% | 100% immediate | Standard option |
| Enhanced match | 100% of first 4% | 100% immediate | Competitive |
| Non-elective | 3% of pay for all eligible employees | 100% immediate | Simplest (no enrollment needed) |
Safe harbor plans cost the employer more in mandatory contributions but eliminate the expensive compliance testing and risk of failed tests that can force refunds to highly compensated employees.
Investment Menu: What to Offer Employees
Recommended Fund Lineup for Small Business 401(k)
| Asset Class | Example Fund | Expense Ratio | Purpose |
|---|---|---|---|
| US Total Market | Vanguard Total Stock Market (VTSAX/VTI) | 0.03% | Core US equity |
| International Stock | Vanguard Total International (VTIAX/VXUS) | 0.07% | Global diversification |
| US Bond Market | Vanguard Total Bond (VBTLX/BND) | 0.03% | Fixed income |
| Target-Date 2030 | Vanguard Target Retirement 2030 | 0.08% | Set-and-forget for older employees |
| Target-Date 2040 | Vanguard Target Retirement 2040 | 0.08% | Set-and-forget for mid-career |
| Target-Date 2050 | Vanguard Target Retirement 2050 | 0.08% | Set-and-forget for younger employees |
| Target-Date 2060 | Vanguard Target Retirement 2060 | 0.08% | Set-and-forget for youngest employees |
| Stable Value / Money Market | Varies | 0.10–0.40% | Capital preservation |
Most employees will benefit from simply choosing the target-date fund closest to their retirement year. Make target-date funds the default investment option (Qualified Default Investment Alternative — QDIA).
How to Set Up a 401(k) for Your Small Business
| Step | Action | Who Does It | Time |
|---|---|---|---|
| 1 | Choose a provider (Guideline recommended) | Business owner | 30 min |
| 2 | Select plan design (match formula, vesting schedule) | Business owner + provider | 1 hour |
| 3 | Sign plan documents | Business owner | 15 min |
| 4 | Connect payroll integration | Admin/provider | 15 min |
| 5 | Onboard employees | Provider (automated) | Automated |
| 6 | Begin payroll deductions | Automated via payroll | Next pay cycle |
| 7 | File annual Form 5500 | Provider (included in fee) | Annually |
Tax Credits for Offering a 401(k)
Small businesses may qualify for tax credits that offset plan costs:
| Credit | Amount | Eligibility | Duration |
|---|---|---|---|
| SECURE Act startup credit | Up to $5,000/year | New plans, under 100 employees | 3 years |
| Auto-enrollment credit | $500/year | Plans with auto-enrollment | 3 years |
| Employer contribution credit | Up to $1,000/employee/year | Under 50 employees | 5 years |
A 10-employee company starting a new 401(k) with auto-enrollment could receive up to $5,500/year in tax credits for the first 3 years — potentially covering the entire cost of the plan.
Frequently Asked Questions
How many employees do I need to start a 401(k)?
Just one — yourself. Solo 401(k) plans are designed for business owners with no employees. For businesses with employees, modern providers like Guideline have no minimum employee count.
What’s the difference between a 401(k) and a SEP IRA?
Both offer tax-deferred retirement savings for business owners. A 401(k) allows employee contributions ($23,500 limit), Roth option, and loans. A SEP IRA only allows employer contributions (25% of compensation), has no Roth option, and no loans. Solo operators can contribute more through a Solo 401(k) due to the employee contribution.
Can I offer a 401(k) with no employer match?
Yes. An employer match is optional, though it significantly increases employee participation and satisfaction. Plans without a match may need to pass annual non-discrimination testing, which can be complex. Safe harbor plans require a match but eliminate testing.
For employees evaluating a 401(k), see what is a 401(k), employer match rates, and contribution limits. Return to the 401(k) Complete Guide.
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