Best Small Business 401k: 8 Providers Compared + Free Checklist
POINTS
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Guideline and Human Interest simplify 401(k) administration.
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Fidelity and Vanguard offer broad investment choices.
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Compare 401(k) fees before choosing a provider.
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Small businesses may qualify for 401(k) tax credits.
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Compare 401(k), SEP IRA, and SIMPLE IRA options before choosing a retirement plan.
Small-business 401(k) providers differ in their fees, plan administration, investment options, and payroll integrations.
Employers can choose from traditional, safe harbor, and SIMPLE 401(k) plan structures, each with different requirements and contribution rules.
What Is a Small Business 401(k)?
A small-business 401(k) is a retirement savings plan that a small company can offer to its employees, and often to its owners.
It works much like the 401(k) plans offered by larger employers.
Small Business 401(k) Eligibility:
- 100 or fewer employees
- Employees earning at least $5,000
- No other retirement plan
- Any eligible business structure
- Growing businesses may qualify for a grace period
- Traditional 401(k)s can be available to businesses of any size
Is Beagle 401(k) Legit? What You Should Know Before Signing Up
Best Small Business 401(k) Providers
Guideline
Best For: Startups and small businesses that want a simple, self-serve 401(k).
From: $119/mo + $8/active participant
- Highly automated setup & compliance
- Transparent, published pricing
- Payroll integration built in
Human Interest
Best For: Owners who want to outsource as much 401(k) administration as possible.
From: $80/mo + $5/eligible employee
- 600+ payroll integrations
- Optional 3(16) fiduciary services
- Strong hands-off administration
Fidelity
Best For: Companies wanting institutional scale and a well-established retirement brand.
From: $300/quarter (Fidelity Advantage)
- Broad, established fund lineup
- Pooled employer / safe-harbor design
- Standard employer match built in
Betterment at Work
Best For: Tech-oriented companies that care about employee usability.
From: $100/mo + $5/participant + 0.25%
- 3(16) and 3(38) fiduciary support
- 350+ payroll integrations
- Clean digital enrollment experience
Vanguard
Best For: Businesses that prioritize low investment costs over turnkey simplicity.
From: ~$4,350/yr bundled (≤15 participants)
- Very low-cost index fund lineup
- Investment-only option available
- Works with third-party administrators
Charles Schwab
Best For: Businesses wanting investment flexibility or advisor/TPA involvement.
From: Custom / quote-based
- Individually designed plan options
- Broad brokerage investment access
- Employer matching supported
ADP
Best For: A company already using ADP for payroll and HR.
From: Quote-based
- Deep payroll/retirement data sync
- Save4Retirement pooled-plan option
- Strong HR/benefits ecosystem
Paychex
Best For: Businesses already using Paychex Flex for payroll and HR.
From: Quote-based
- Payroll + HR + retirement in one
- Simplified eligibility & deductions
- Profit-sharing plan options
Pricing reflects currently published information where available; actual costs vary by plan design, participant count, assets, services and investment choices. Quote-based providers require a custom quote for exact pricing.
1. Guideline (by Gusto)
Guideline, now part of Gusto, is a cloud-based 401(k) provider focused on serving micro and small businesses across the United States.
The platform offers automated plan administration, compliance monitoring, recordkeeping, payroll integration, and investment management, with particularly strong, native integration for Gusto Payroll customers.
- Starter 401(k): Simplified plan; no employer contributions
- Core 401(k): Standard 401(k) with employer match, profit sharing, and Safe Harbor options
- Premium 401(k): More flexible, customizable plan design with premium support and additional options
- Solo 401(k): Designed for owner-only businesses
- Roth contributions and automatic enrollment supported across eligible plans
| Plan | Base Fee | Per Participant | Account Fee |
|---|---|---|---|
| Starter | $49/month | $6/active participant/month | 0.25% annually |
| Core | $119/month | $8/active participant/month | 0.25% annually |
| Premium | $179/month | $8/active participant/month | 0.25% annually |
Participant account fee typically ranges 0.15%–0.35% annually, depending on plan and pricing arrangement. No separate distribution, loan, rollover, or Form 5500 preparation fees (audit fees may apply).
Target Size:
Ideal for
- Micro (1–4) and
- Small (5–49) employers.
A separate Solo 401(k) option exists for one-person businesses. No minimum headcount or plan assets is advertised; even a sole proprietor can enroll.
Key Features:
- Recordkeeping & Compliance: Fully managed online. Guideline prepares Form 5500 and includes nondiscrimination ADP/ACP testing.
- Investments: Offers 6 target-date portfolios and 40 low-cost Vanguard funds.
- Tools: Participant web portal and mobile app for account management.
- Payroll Integration: Tight integration provides a one-platform experience. Also integrates via API with other payrolls.
- Fiduciary: Offers a standard plan document on all plans; investment fiduciary service included on Premium plans. Plan sponsor remains named fiduciary.
Minimums:
No minimum plan size or assets to start.
Pros
- Low flat fees and transparent pricing
- Easy online setup, can launch in about 15 minutes
- Simple administration
- Automatic compliance, including ADP/ACP testing and Form 5500
- Optional fiduciary support through a 3(38) investment manager
- Broad, Vanguard-based investment options
- Particularly competitive for businesses using Gusto payroll, thanks to seamless integration
- Supports Roth 401(k) contributions and auto-enrollment
Cons
- Limited investment lineup, with no non-Vanguard boutique funds
- Newer company with less of a long-term track record than established incumbents
- No in-house financial advisors; fiduciary support is provided by an outsourced 3(38) consultant
- Starter plan does not allow an employer match
- For plans with low billable assets, the 0.25% advisory fee may cost more than pure pass-through asset-based plans
2. Human Interest
Human Interest is a cloud-based 401(k) provider focused on serving small and growing businesses across the United States.
The platform provides automated plan administration, compliance monitoring, payroll integration, recordkeeping, and investment services, backed by 600+ payroll integrations.
- Traditional 401(k)
- Roth 401(k)
- Safe Harbor 401(k)
- Profit-Sharing 401(k)
- 403(b)
Employers can customize matching and vesting options to fit their plan design.
| Plan | Base Fee | Per Eligible Employee |
|---|---|---|
| Essentials | $80/month | $5/month |
| Complete | $180/month | $7/month |
| Concierge | $280/month | $9/month |
Investment advisory: 0.01%/month (3(38)) or 0.018%/month (3(21)). Recordkeeping/custody: 0.05%/month. A one-time setup fee of $499 may apply. Standard employer and employee transactions carry no transaction fees.
Key Features:
- Recordkeeping & Compliance: Human Interest provides complete plan administration: contribution processing, vesting schedules, distributions, nondiscrimination (ADP/ACP) testing, 5500 filings, IRS and DOL notices.
- Investments: Uses a curated lineup of 40 low-cost funds and proprietary target-date portfolios.
- Fiduciary Support: Provides fiduciary and optional investment management for plan sponsors.
- Payroll Integration: Syncs with 600+ payroll providers.
- Participant Tools: Online portal for employees; onboarding support; financial wellness and retirement education content; matching calculators.
Pros
- Predictable flat pricing, making budgeting easier
- Strong fiduciary support built in
- Modern, user-friendly online interface
- Strong emphasis on customer service, with guaranteed U.S.-based support
- Focus on maximizing available tax credits, including SECURE Act credits
- Turnkey plan administration with low per-participant costs
- Used by more than 47,000 employers
Cons
- $499 initial setup fee can be significant for very small startups
- $80 base fee is higher than some competitors, such as Guideline’s $49 Starter plan
- Becomes more cost-effective as employee count grows
- Limited investment flexibility, primarily Vanguard funds and target-date options
- Some plan designs have limited flexibility; 401(k) profit sharing is available only through matching or non-elective formulas
- Smaller provider with less nationwide brand recognition than larger industry incumbents
3. Fidelity Workplace
Fidelity is a large, full-service retirement provider offering solutions for businesses of all sizes.
For small businesses, Fidelity offers streamlined plans as well as traditional 401(k) solutions, backed by broad investment choices and strong administrative and fiduciary capabilities.
- Fidelity Advantage 401(k): Simplified Safe Harbor 401(k) for businesses offering a 401(k) for the first time, up to 1,000 employees
- Traditional 401(k): More customizable 401(k) for established plans
- Self-Employed 401(k): For owner-only businesses or businesses with only a spouse as an employee
- SIMPLE IRA: For businesses with up to 100 employees
- SEP IRA: Primarily for self-employed individuals and very small businesses
- Investment-Only Plan: Adds Fidelity investment options to an existing retirement plan
| Plan | Fees |
|---|---|
| Fidelity Advantage 401(k) | $500 one-time startup fee + $300/quarter plan administration |
| Participant fees | $25/quarter recordkeeping + 0.125% of account balance per quarter for investment services |
| Self-Employed 401(k), SEP IRA & SIMPLE IRA | No account fees or minimums to open |
| Traditional 401(k) | Pricing varies by plan size, services, and investment lineup; typically requires a customized quote |
| Investment-Only Plan | No Fidelity account fees; third-party administrator fees may apply |
Key Features:
- Recordkeeping: Fidelity does the full admin. They perform ADP/ACP testing for traditional 401(k) plans; Safe Harbor designs automatically comply.
- Investments: Very broad. Sponsors can offer Fidelity mutual funds/ETFs and non-Fidelity funds.
- Fiduciary Support: Sponsors maintain fiduciary responsibility.
- Payroll Integration: Integrates with major payroll systems. Deductions can be automated once set up.
- Participant Tools: Robust web/mobile platforms, 24/7 phone support from retirement specialists.
Minimums:
There is no minimum plan size or asset is required for Advantage 401(k).
But plans with very low contributions may incur small account fees unless waived.
Pros
- Very low or no administrative fees for small plans
- Unlimited fund choices with no proprietary investment bias
- Access to some of the industry’s lowest-cost funds
- 24/7 customer support and in-depth investment education
- Large, established custodian that may appeal to cautious fiduciaries
- Supports Roth 401(k) contributions and auto-enrollment
Cons
- Less “done-for-you” plan administration than smaller, turnkey providers
- Employers may need to take a larger role in administration, particularly without an external advisor
- Payroll and enrollment setup can require more manual work initially
- A flat $100/month fee may be relatively expensive for very small plans with only a few employees
- Sponsors retain fiduciary responsibilities unless they pay for advisory services
- Higher-tier advisory or administration options can add significant costs; for example, Fidelity’s Enhanced tier has been cited at roughly $250–$400 in base fees
4. Betterment at Work
Betterment at Work is a digital 401(k) provider focused on small and mid-sized businesses.
The platform combines automated administration with customizable plan design, investment management, payroll integrations, and employee financial wellness tools.
- Traditional 401(k): Flexible employer contributions and plan design
- Safe Harbor 401(k): Helps simplify compliance testing through required employer contributions
- Custom 401(k): Flexible options for eligibility, vesting, profit sharing, and matching
- Roth 401(k): Roth employee contributions are supported
- Automatic enrollment and auto-escalation
- 350+ payroll integrations, including Gusto
- Automated compliance testing and Form 5500 preparation
- 3(16) administrative and 3(38) investment fiduciary services
- Expert-managed, globally diversified investment portfolios
- Customizable investment options, including flexible portfolios
- Automatic portfolio rebalancing
- Personalized retirement planning and in-app guidance
- Employee education through articles, videos, webinars, and emails
- Dedicated onboarding and ongoing plan support
- Employer dashboard with plan metrics, reports, payroll status, and participant data
- Optional 529 Education Savings and Financial Coaching
- Optional 401(k) matching for qualified student-loan payments
Fee Structure: Betterment uses tiered pricing:
| Feature | Essential | Pro | Flagship |
|---|---|---|---|
| Monthly base fee | $100 | $150 | Custom |
| Annual base fee | $1,200 | $1,800 | Custom |
| Recordkeeping | $5 / participant / month | $7 / participant / month | Custom |
| Advisory fee | 0.25% / year | 0.25% / year | Custom |
| Best for | Smaller teams | Growing teams | Customized needs |
5. Vanguard 401(k)
Vanguard offers 401(k) solutions for small, midsize, and large businesses, with a strong focus on low-cost investments, flexible plan design, and retirement-focused participant services.
Its Vanguard Retirement Plan Access (VRPA) is designed specifically for small and midsize businesses.
- Traditional 401(k): Flexible employer and employee contribution options
- Safe Harbor 401(k): Simplifies compliance testing and can help maximize owner/high-earner contributions
- Individual 401(k): For self-employed business owners with no employees other than a spouse
- SEP-IRA: Employer-funded retirement plan for businesses with few employees
- SIMPLE IRA: Designed for businesses with fewer than 100 employees
- Roth 401(k): Available within eligible 401(k) plans
- Low-cost Vanguard index funds, target-date funds, ETFs, and actively managed funds
- Flexible investment lineup, including non-Vanguard investments depending on plan size
- Automated payroll contributions and online account management
- Recordkeeping and participant account services
- Online compliance testing and plan administration support
- Participant retirement planning tools, calculators, and education
- Automatic enrollment and contribution escalation options
- Employer matching and profit-sharing capabilities
- Optional self-directed brokerage accounts for eligible plans
- Dedicated service and support for plan sponsors
- Retirement readiness tools and participant education resources
Pros
- Excellent investment reputation, particularly for low-cost index funds
- Broad range of investment choices
- Strong retirement planning and participant education resources
- Flexible plan design for different business sizes
- Established, highly experienced retirement provider
- Good fit for employers that prioritize investment quality and long-term costs
Cons
- Can be less streamlined for very small businesses than newer digital-first providers
- Plan administration may involve third-party administrators depending on the arrangement
- Less of an all-in-one payroll/HR experience than providers such as Guideline or Human Interest
- Extensive investment choices can create more complexity for participants
- Some advanced features are dependent on plan size and specific plan structure
Target Size:
- Small to medium (10–500+ employees).
- VRPA has ~20,000 plans (1M participants).
It has no official minimum employees or assets, but historically plans often needed at least $5,000 in annual contributions or $500,000 in assets to waive fees.
| Vanguard Pricing | Cost |
|---|---|
| Base plan fee | From $3,275/yr |
| Additional participant fee | $50–$75 / participant / yr |
| Investment fees | Varies by fund |
| Plan administration | Included with bundled option |
| Pricing model | Participant-based |
| Best for | Cost-conscious employers |
Vanguard’s primary cost advantage is in fund expenses: an average fund at Vanguard costs only 0.07%.
Unlike others, Vanguard does not charge advisory percentages on assets for this product.
6. Charles Schwab
Charles Schwab offers retirement solutions ranging from Individual 401(k)s for owner-only businesses to Business 401(k) plans for larger companies.
The company emphasizes investment flexibility, low-cost brokerage access, and personalized investment support.
- Business 401(k): Designed for businesses of any size, with greater plan customization
- Individual 401(k): Traditional and Roth options for owner-only businesses with no employees other than a spouse
- SIMPLE IRA: For businesses with up to 100 employees
- SEP IRA: Primarily for self-employed individuals and small businesses
- Company Retirement Account: Investment-only solution for businesses that already have a retirement plan
- Personal Defined Benefit Plan: For owner-only businesses or businesses with up to five employees
| Plan | Fees |
|---|---|
| Individual 401(k) | $0 account opening and maintenance fees; $0 minimum |
| Business 401(k) | $0 account opening and maintenance fees; plan administration/recordkeeping fees may apply depending on the arrangement |
| SEP IRA | $0 account opening and maintenance fees |
| SIMPLE IRA | $0 account opening and maintenance fees |
| Company Retirement Account | $0 account opening and maintenance fees |
| Personal Defined Benefit Plan | Setup fees start at $2,250, plus annual service fees |
Fund expenses, brokerage commissions, and other plan-specific fees may apply.
Pros
- Broad investment flexibility and access to Schwab’s brokerage platform
- $0 account opening/maintenance fees for many retirement accounts
- Strong brand and long-standing investment experience
- Traditional and Roth options available
- Good fit for both self-employed owners and larger businesses
- One-on-one investment guidance available
Cons
- Business 401(k) pricing can be less straightforward than flat-fee digital providers
- More investment choice can mean greater complexity for employees
- Less of an all-in-one payroll/HR platform than providers such as Guideline or Human Interest
- Small-business owners may need additional third-party administration depending on the plan structure
- Best suited to businesses comfortable managing a more traditional brokerage-based retirement setup
Key Features:
- Recordkeeping: Solo 401(k) plans are self-service: owners deposit contributions to a Schwab brokerage account. Schwab provides the platform, but the owner handles testing and IRS forms.
- Investments: Extremely broad. Schwab offers thousands of ETFs/mutual funds plus trading in stocks and bonds.
- Fiduciary: For solo plans, the owner is fiduciary. Schwab itself is just a custodian.
- Payroll Integration: Minimal for solo plans. Schwab’s business plans can integrate with some payrolls via intermediaries but require setup.
- Participant Tools: Schwab’s online portal lets participants view account balances, access research tools, and initiate trades.
7. ADP Retirement Services
ADP Retirement Services is a full-service retirement provider serving businesses from very small employers to large enterprises.
ADP combines retirement plan administration with payroll and HCM integration, making it particularly useful for businesses already using ADP payroll.
- Starter-k Complete: Entry-level 401(k) for 1–9 employees; employee contributions only
- 401(k) Essential: Flexible 401(k) designed primarily for businesses with 1–49 employees
- 401(k) Enhanced: Designed for midsize businesses with 50–99 employees, with greater plan-design flexibility
- 401(k) Premier: Designed for businesses with 100+ employees and more complex retirement needs
- Safe Harbor 401(k)
- 403(b)
- SIMPLE IRA
- SEP IRA
- Pooled Employer Plan (PEP)
- Integrated payroll and retirement administration through ADP
- Automatic enrollment and contribution escalation
- Traditional and Roth 401(k) contributions
- Employer matching and profit-sharing options
- 3(16) administrative fiduciary services
- 3(21) and 3(38) investment fiduciary services
- Compliance testing and Form 5500 support
- Broad, open investment architecture with non-proprietary investment options
- Employee financial wellness and retirement planning tools
- ADP mobile app and online participant access
- Dedicated service teams for larger plans
- Support for mergers, acquisitions, and plan transitions on higher-tier plans
- PEP option for employers seeking pooled administration and fiduciary oversight
| Plan | Fees |
|---|---|
| Starter-k Complete | $100/month for 0–4 employees; $100/month + $5/participant/month for 5+ employees |
| 401(k) Essential, Enhanced & Premier | Pricing varies based on employee count, plan design, and services; quote required |
Additional services such as investment management, participant notices, and other optional services may carry additional fees.
Pros
- Strong ADP payroll integration with automatic deductions
- Transparent flat-fee pricing; Starter 401(k) is $100/month
- 3(21) and 3(38) fiduciary options
- Modern portal and dedicated support
- Flexible plan design, auto-enroll, loans, and HCE testing
- PEP option for multi-employer administration
Cons
- Can be pricey for very small plans
- Limited investment guidance without an advisor
- Fund costs may be higher than low-cost platforms
- Technology is less polished than fintech competitors
- Some features still require paperwork
- Fees can rise with added services
8. Paychex Retirement Plans
Paychex Retirement Plans is a full-service retirement provider focused on small businesses through large employers.
Paychex combines 401(k) administration, recordkeeping, payroll, and HR services through Paychex Flex, with options for businesses that use Paychex or other payroll providers.
- Traditional 401(k): Flexible employee and employer contributions
- Safe Harbor 401(k): Employer contributions with simplified compliance testing
- Profit-Sharing 401(k): Allows additional employer contributions
- Pooled Employer 401(k) Plan (PEP): Shared plan structure designed to reduce administrative and fiduciary burden
- Solo 401(k): For owner-only businesses
- SIMPLE IRA
- SEP IRA
- 403(b)
- Direct integration with Paychex Flex payroll for automated contributions and reporting
- Integrates with 70+ other payroll providers
- Online enrollment, with employees able to enroll in as few as four clicks
- Automatic enrollment and contribution options
- Traditional and Roth contributions
- Employer matching and profit-sharing
- Recordkeeping and third-party administration (TPA)
- Compliance support and required reporting
- Thousands of investment options through an investment-neutral platform
- 3(38) investment management and fiduciary services
- Participant dashboard for contributions, investments, balances, and retirement planning
- Employee education and personalized retirement resources
- Dedicated implementation support and ongoing service
- PEP option can shift significant administrative and fiduciary responsibilities to the pooled plan provider
Paychex Pricing |
Cost |
|---|---|
| Base / administration fee | Custom quote |
| Participant fees | Custom quote |
| Investment fees | Varies by investment |
| Setup / implementation | May apply |
| Additional services | May apply |
| Pricing model | Customized / bundled |
Pros
- Seamless Paychex payroll integration
- One platform for payroll, HR, benefits, and retirement
- High-touch service and strong Flex technology
- PEP/MEP options can lower admin and audit costs
- Strong employee education and engagement tools
- PEO option bundles payroll, HR, and retirement
Cons
- Relatively high fees
- Fee disclosures and revenue-sharing can be unclear
- Less flexibility in plan design
- Limited choice of third-party TPAs may increase costs
- Cheaper alternatives may offer similar services
Choosing a Provider: Checklist Tool
Choosing the best 401(k) provider depends on factors like business size, budget, desired features, and payroll system. Key criteria include:
Use this matrix along with the table above to match provider strengths to your priorities.
| What Matters | Guideline / Human Interest | Betterment | Fidelity / Vanguard / Schwab | ADP / Paychex |
|---|---|---|---|---|
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Cost
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Work for the Employer
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Payroll Connection
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Best for Very Small Teams
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Best for 5–50 Employees
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Best for 50–100 Employees
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Help With Legal Responsibilities
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Technology & Employee Experience
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Small Business 401(k) Costs and Fees
The table below compares the main costs across popular small-business providers, including employer fees, participant fees, and investment costs.
| Provider | Employer / Admin Cost | Employee Cost | Investment Cost | Overall Cost Clarity |
|---|---|---|---|---|
| Guideline / Human Interest | Low / transparent | Varies | Varies | High |
| Betterment | $100–$150/mo | $5–$7/mo | 0.25%/yr advisory | High |
| Fidelity Advantage | $500 setup + $300/quarter | $25/quarter | 0.125%/quarter | High |
| Vanguard VRPA | From $3,275/yr* | Varies | Varies | High |
| ADP / Paychex | Custom quote | Varies | Varies | Medium |
Most providers charge an initial plan setup fee ranging from $500–$3,000.
Ongoing plan administration usually breaks into:
- Flat base fee
- Per-participant fee, and
- Asset-based fees.
401(k) Tax Credits for Small Businesses
Small employers can claim lucrative tax credits for starting a retirement plan.
| Tax Credit | Potential Benefit | Notes |
|---|---|---|
| Start-up costs | Up to $5,000/year | Helps cover the cost of starting and administering a new retirement plan |
| Employer contributions | Additional credit | May help offset certain employer contributions |
| Auto-enrollment | $500/year | Available when an eligible plan adds automatic enrollment |
| Military spouse | Up to $500/year per qualifying spouse | Available to certain small employers that meet specific requirements |
Small Employer Retirement Plan FAQs
No, federal law does not currently require businesses to offer a 401(k), although some states require employers without a plan to offer an auto-IRA.
Yes, a plan can set age and service requirements, such as age 21 and one year of service, subject to applicable rules.
Pre-tax contributions reduce your taxable income now but are taxed when withdrawn, while Roth contributions are made after tax and can generally be withdrawn tax-free if the applicable rules are met.
No, automatic enrollment is optional, but it can increase participation and may qualify the employer for a tax credit.
You choose the employer contribution formula in the plan document, subject to IRS limits on total employer and employee contributions.
Yes, a Solo 401(k) can be a good option because the owner can contribute as both an employee and employer, subject to annual IRS limits.
Generally, you may need to file Form 5500 or 5500-SF annually, and Form 8881 may be used to claim an eligible startup tax credit.
A 401(k) generally offers the most flexibility and savings potential, while a SEP IRA is simpler and employer-funded, and a SIMPLE IRA is designed for small businesses that want an easier plan with lower contribution limits.
Common pitfalls include late employee contribution deposits, missed required testing, errors in automatic enrollment or escalation, and failing to follow the plan document.
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