Guideline built its position around technology-enabled retirement administration for small businesses, with an emphasis on automated plan administration, payroll connectivity, participant technology, investment services, and simplified 401(k) management.
Guideline is now part of Gusto. Gusto announced on November 6, 2025 that the acquisition was complete and introduced Gusto 401(k) powered by Guideline, bringing retirement more directly into Gusto’s payroll, benefits, and HR environment.
That integration is especially relevant for employers already using Gusto Payroll. Gusto currently describes payroll deductions and retirement contributions as automatically synchronized, while employers and employees can access retirement information from the broader Gusto environment. Employers that do not use Gusto Payroll can still use a separate self-service retirement experience rather than being required to change payroll immediately.
ESI operates through a different employment structure. ESI is a Professional Employer Organization, and retirement is one part of a broader employer-services relationship that can also include payroll, HR, employee benefits, workers’ compensation, compliance, risk management, and workforce administration. ESI currently promotes a Multiple Employer Plan as its primary public 401(k) structure.
Guideline / Gusto 401(k) helps employers build and administer retirement benefits, particularly when payroll integration is important. ESI asks whether retirement should operate inside a broader PEO relationship connecting more of the employer’s workforce responsibilities.
Compare Providers:
ESI vs. Engage PEO
Comparison Area | Guideline / Gusto 401(k) | ESI |
Primary Role | Technology-enabled workplace retirement administration within the Gusto organization | Full-service Professional Employer Organization |
Current Positioning | Gusto 401(k) powered by Guideline | Direct PEO |
Core Focus | 401(k) administration, technology, investments, plan design, fiduciary services, and payroll connectivity | Payroll, HR, employee benefits, retirement, workers’ compensation, risk management, compliance, and workforce technology |
Retirement Structure | Starter, Core, and Premium 401(k) tiers with different plan-design capabilities | Multiple Employer Plan within the broader PEO environment |
Payroll | Direct integration with Gusto Payroll; self-service retirement path available for employers using other payroll systems | Payroll administration is a core part of the PEO relationship |
Administration | Gusto Retirement Services provides recordkeeping and administration; eligible payroll-integrated clients may use 3(16) services | Retirement administration operates within ESI’s broader MEP structure |
Investment Services | Gusto Investment Services can provide investment advisory and 3(38) services when selected | Investment options and retirement support operate through the ESI MEP and retirement partners |
HR | Gusto offers broader HR products, but the retirement product itself remains retirement-focused | Ongoing HR support within the PEO relationship |
Employee Benefits | Retirement plus access to Gusto’s broader benefits ecosystem | Retirement integrated with a broader employee-benefits environment |
Workers’ Compensation | Not a function of the 401(k) product | Workers’ compensation and risk support available through the PEO structure for qualifying employers |
Employment Structure | A Gusto 401(k) relationship does not itself create PEO co-employment | Direct PEO co-employment relationship |
Potential Fit | Employers primarily seeking a modern 401(k), especially organizations using or considering Gusto Payroll | Employers evaluating retirement together with payroll, HR, benefits, workers’ compensation, compliance, and broader employer administration |
Gusto Retirement currently offers three 401(k) tiers: Starter, Core, and Premium. Starter is designed as a simplified plan for eligible employers that have not offered a retirement plan during the relevant prior period, while Core supports standard and Safe Harbor designs plus employer contributions. Premium adds higher-touch support and is required initially for employers transferring an existing plan to Gusto.
ESI’s current retirement proposition centers on its MEP. ESI describes pooled participation, automatic payroll deductions, flexible plan-design options, and reduced administrative and fiduciary burdens as important elements of that structure.
The core distinction is specialized retirement administration and payroll integration versus retirement embedded within a broader PEO employment infrastructure.
An employer searching for a Guideline alternative may have a focused retirement problem. Leadership may want to establish its first 401(k), simplify an existing plan, improve payroll connectivity, reduce manual contribution work, add Safe Harbor features, change employer matching, or improve the participant experience.
Guideline / Gusto 401(k) is designed directly around those retirement needs. The current product combines retirement administration, payroll integration, digital participant access, plan-design options, and investment services, with especially tight connectivity for employers already using Gusto Payroll.
The comparison changes when retirement is only one of several employer responsibilities under review. Leadership may also be struggling with payroll administration, HR capacity, employee benefits, workers’ compensation, compliance, employee records, workforce technology, or the number of providers internal staff must coordinate.
In that situation, adopting a different 401(k) solves only one component of the employer problem. ESI becomes relevant because retirement sits inside a broader employment-services relationship rather than operating as the primary service being purchased.
If retirement administration is the isolated problem, compare retirement providers. If the organization is reconsidering the broader employment operating model, compare the PEO relationship as well.
Guideline is the retirement business that became part of Gusto in 2025. Gusto now presents the product as Gusto 401(k) powered by Guideline, while current Guideline web properties operate as part of Gusto’s retirement-services environment.
For Gusto Payroll customers, retirement can operate directly alongside payroll. Gusto says employers can manage the 401(k) within Gusto, with contributions and deductions synchronized automatically and employee retirement access connected to the broader platform.
Employers using other payroll providers can still establish a retirement plan through the self-service retirement portal. That means selecting Gusto 401(k) does not necessarily require an immediate payroll conversion.
The retirement offering currently includes Starter, Core, and Premium tiers. Starter has more limited plan features, while Core supports standard and Safe Harbor designs and employer contributions. Premium provides additional support and accommodates existing-plan transfers.
Administrative and recordkeeping services are provided through Gusto Retirement Services, while Gusto Investment Services provides investment advisory services when selected. Gusto Retirement can also provide 3(16) plan-administration services for eligible employers using its payroll integration, and Gusto Investment Services can serve as the 3(38) investment manager when appointed.
The retirement product does not itself create PEO co-employment. Guideline / Gusto 401(k) is therefore best understood as specialized retirement infrastructure that can sit alongside payroll and other employer systems, while ESI is proposing a broader employment-services relationship.
The first question is whether leadership mainly wants a better retirement plan or whether the company is reconsidering several employer responsibilities at the same time.
If payroll is performing well, HR has sufficient capacity, health benefits are competitive, workers’ compensation is effectively managed, and retirement is the primary gap, Guideline / Gusto 401(k) can provide a focused solution without requiring the employer to restructure the rest of its workforce environment.
The company can concentrate on retirement plan design, employee contributions, employer matching, Safe Harbor options, investment services, participant experience, fees, fiduciary support, and payroll integration. Those are the areas Gusto Retirement is specifically designed to address.
ESI becomes more relevant when retirement appears alongside broader needs involving payroll, HR, employee benefits, risk, workers’ compensation, and recurring employment administration. ESI’s MEP is one component of a wider PEO model rather than an independent retirement product.
A company should not adopt a PEO simply because it needs a 401(k). But it should not evaluate retirement in isolation when the larger employment infrastructure is also creating problems.
Payroll integration is one of the strongest current arguments for Gusto 401(k). Gusto Payroll users can have retirement deductions and contributions synchronized with payroll, reducing reliance on separate file transfers and third-party payroll connections.
That integration can create meaningful administrative value. Employee compensation, contribution elections, payroll runs, and retirement contributions are closely related, so reducing manual handoffs can improve the operating experience.
ESI takes the relationship one step further structurally because payroll administration itself sits inside the broader PEO environment. ESI’s current MEP materials identify automatic payroll deductions as one of the retirement plan’s employer benefits.
The employer should therefore distinguish payroll connectivity from payroll responsibility. Gusto can create a strong shared payroll-retirement technology experience, while ESI should demonstrate whether managing payroll and retirement within the broader PEO relationship creates additional value.
The useful questions become operational: who updates eligibility, who corrects an inaccurate deduction, who handles a late employee change, and who owns the problem when payroll information and retirement records do not agree?
Guideline / Gusto can make payroll-to-retirement integration highly efficient. ESI should demonstrate whether broader ownership of payroll and workforce administration reduces additional boundaries beyond the retirement plan.
Guideline / Gusto currently gives employers several plan-design paths. Core supports standard and Safe Harbor structures plus matching and profit sharing, while Premium adds more customized support and accommodates plan transfers. Starter serves a more limited group of eligible employers establishing a simplified plan.
The retirement environment can also include delegated fiduciary services. Gusto Investment Services can serve as the plan’s 3(38) investment manager when appointed, while Gusto Retirement can provide 3(16) plan-administration services for eligible payroll-integrated customers. The employer still retains responsibilities, including prudent oversight of selected service providers.
ESI’s current public retirement strategy centers on a Multiple Employer Plan. Its positioning emphasizes pooled resources, reduced administrative burdens, automatic payroll deductions, flexible plan design, and reduced fiduciary responsibility within the MEP framework.
Neither structure should be labeled automatically superior. A company may prefer a retirement plan configured around its own selected Gusto tier, while another employer may value participating in a PEO-associated pooled plan.
The decision should examine the actual written responsibilities. Leadership should compare plan design, eligibility, matching, vesting, investments, administrative roles, fiduciary duties, transition requirements, and employer obligations rather than choosing based on labels such as “3(16),” “3(38),” or “MEP.”
Technology is central to Guideline / Gusto’s retirement proposition. Gusto Payroll customers can access retirement within the broader Gusto dashboard, while participants continue to use digital retirement tools and the Guideline mobile experience.
That integration can be especially attractive to an employer already committed to Gusto. Payroll and retirement can operate in one technology ecosystem without requiring the organization to adopt PEO co-employment.
ESI’s technology decision operates at a broader level because retirement is only one workforce function inside the PEO relationship. Payroll, HR, employee information, benefits, and other employer processes also become part of the operating environment.
The comparison should therefore avoid a simplistic “one platform versus multiple platforms” argument. An integrated technology stack can be highly effective without being a PEO, while a PEO can create value through people, processes, risk support, and service ownership that extend beyond software.
Guideline / Gusto integrates retirement deeply with payroll technology. ESI should demonstrate whether connecting retirement with payroll, HR, health benefits, workers’ compensation, compliance, and professional support creates enough additional value to justify the broader model.
Guideline / Gusto 401(k) may be particularly useful when retirement is the principal problem the company wants to solve. An employer whose payroll, HR, health benefits, workers’ compensation, and compliance infrastructure already performs well may have little reason to change those relationships simply to establish or improve a 401(k).
The product can be especially compelling for Gusto Payroll users because retirement contributions and payroll can operate through a tightly connected environment. Gusto currently promotes automated synchronization, a shared employer experience, and retirement management within the Gusto dashboard.
Employers that are not using Gusto Payroll can still consider the retirement service without immediately replacing payroll. Gusto maintains a self-service retirement path for those organizations.
The current Starter, Core, and Premium structures also give employers several levels of retirement-plan functionality and support. Core includes standard and Safe Harbor designs plus employer contributions, while Premium supports plan transfers and additional service.
Guideline / Gusto may also appeal to employers that specifically want delegated investment or administration responsibilities where eligible. Those services should be reviewed through the actual plan agreements rather than assumed from the product name alone.
If leadership wants a modern retirement solution and is otherwise comfortable with its employment infrastructure, Guideline / Gusto 401(k) deserves serious consideration.
A direct ESI evaluation becomes more relevant when retirement is one item on a much larger list of employer challenges. The company may be evaluating payroll, HR capacity, employee benefits, workers’ compensation, compliance, workforce systems, and retirement at the same time.
Guideline / Gusto can create a strong payroll-retirement combination, but the employer must still determine how the rest of the employment environment will operate. Gusto itself provides broader payroll, HR, and benefits technology, but adopting Gusto 401(k) does not by itself create the PEO co-employment structure ESI is proposing.
The relevant ESI question is therefore not whether ESI also has a 401(k). Leadership should determine whether the broader PEO structure would improve payroll execution, HR accessibility, benefits administration, employment-risk management, workers’ compensation, compliance, technology, and service ownership.
This becomes especially important when leadership is already acting as the integration layer among several providers. A new hire, leave, termination, benefit change, or payroll correction can affect multiple employment systems at once.
ESI should earn consideration by demonstrating that its complete operating model reduces that coordination burden. The case for ESI is strongest when the employer needs more than retirement technology and more than payroll-retirement integration alone.
Guideline’s acquisition by Gusto materially changes how employers should understand the company today. Gusto completed the acquisition in November 2025 and now presents the offering as Gusto 401(k) powered by Guideline.
The strategic relationship is clear in the current product experience. Gusto Payroll customers can manage retirement alongside payroll and other benefits, while payroll deductions and contributions synchronize automatically.
Existing and non-Gusto-payroll customers have not been forced into an immediate full Gusto conversion. Guideline’s current site continues to provide a self-service retirement pathway and access to the retirement platform and mobile application.
The underlying regulated roles are also important. Gusto Retirement Services provides retirement administration and recordkeeping, while Gusto Investment Services provides investment advisory services where applicable.
This makes the comparison with ESI more nuanced than saying “Guideline only does retirement.” Guideline now operates inside a much broader Gusto payroll, HR, and benefits ecosystem.
The remaining distinction is structural. Gusto and Guideline are integrating payroll, benefits technology, and retirement. ESI is asking whether the employer also wants a PEO relationship encompassing payroll, HR support, benefits, workers’ compensation, compliance, risk, and broader employment administration.
A 401(k) can be an important part of an employer’s talent and benefits strategy, and Guideline / Gusto provides meaningful depth around that one area. Plan design, payroll integration, investment management, participant experience, fiduciary support, administration, and pricing all deserve careful consideration.
Employees experience much more than retirement, however. They experience payroll, health benefits, onboarding, HR support, leave, workers’ compensation, employee records, managers, compliance processes, and workforce technology.
That is why the comparison should preserve the distinction between retirement quality and employment-infrastructure quality. A company can have an excellent 401(k) while still spending substantial internal time coordinating the rest of the employee experience.
ESI’s MEP should therefore not be positioned as automatically better simply because it sits within a PEO. The stronger argument is that leadership can evaluate retirement alongside the other employment responsibilities ESI is proposing to manage.
Guideline / Gusto should be evaluated on how well it solves the retirement problem. ESI should be evaluated on whether solving retirement inside a broader PEO structure improves the employer’s complete operating environment.
Moving from Guideline / Gusto 401(k) to an ESI evaluation does not automatically mean the existing retirement plan should be terminated. Leadership should first understand the current retirement arrangement and then compare it with the specific ESI MEP being proposed.
The company should document its current plan tier and design, employee eligibility, employer matching or profit sharing, vesting, participant balances, outstanding loans, investment options, administrative responsibilities, fiduciary roles, fees, and payroll integration.
If an existing plan would move into a different retirement structure, the transition needs formal coordination. Gusto’s own retirement guidance treats plan conversions as structured processes involving the incumbent and new providers rather than simple technology switches.
Leadership should then compare the ESI MEP directly. ESI currently positions its plan around pooled participation, automatic payroll deductions, flexible design options, and reduced administrative and fiduciary burden.
The retirement transition should also be separated from the broader PEO implementation. If payroll, HR, employee benefits, workers’ compensation, or workforce systems are moving to ESI, those changes involve their own data, timing, communication, and implementation responsibilities.
The objective should not be replacing Guideline simply because ESI has a retirement program. The objective is determining whether the ESI PEO relationship and proposed MEP together create enough additional value to justify changing the current retirement and employment structure.
No. Guideline is a retirement-plan technology and administration business that is now part of Gusto. Its current retirement offering is presented as Gusto 401(k) powered by Guideline.
Gusto provides broader payroll, HR, and benefits products, but adopting the 401(k) does not itself create a PEO co-employment relationship. ESI differs because ESI is the direct PEO.
Yes. Gusto announced the completed Guideline acquisition on November 6, 2025 and launched Gusto 401(k) powered by Guideline.
Existing retirement customers continue to use Guideline/Gusto retirement resources while Gusto increasingly integrates retirement with its payroll and benefits environment.
The best Guideline alternative depends on the employer’s actual problem. If leadership primarily wants another retirement platform, compare plan design, administration, fiduciary services, investments, payroll integration, technology, and cost.
ESI represents a different type of alternative when retirement is only one component of a broader evaluation involving payroll, HR, employee benefits, workers’ compensation, compliance, risk, and workforce administration.
Guideline / Gusto specializes in retirement administration and integrates particularly closely with Gusto Payroll. ESI is a Professional Employer Organization whose relationship can extend across payroll, HR, employee benefits, retirement, workers’ compensation, risk management, and other workforce responsibilities.
The distinction is therefore broader than retirement features. Employers should decide whether they are purchasing a retirement solution or reconsidering the employment operating model itself.
Yes. Gusto Payroll customers currently receive direct synchronization between payroll and Gusto 401(k), including automated deductions and retirement contributions.
Employers that do not use Gusto Payroll can still use Gusto Retirement through its self-service portal.
Gusto Retirement currently uses Starter, Core, and Premium pricing tiers. Starter is a simplified option for eligible employers, Core supports standard and Safe Harbor designs plus employer contributions, and Premium includes additional support and plan-transfer capabilities.
Plan features and eligibility should be verified against the employer’s current written proposal and plan documents.
Yes, depending on the services selected. Gusto Investment Services can serve as a 3(38) investment manager when appointed, while Gusto Retirement can act as the 3(16) plan administrator for eligible payroll-integrated employers.
The employer remains responsible for certain fiduciary duties, including prudent monitoring of designated service providers.
Not automatically. Gusto 401(k) can be particularly attractive for businesses already using Gusto Payroll because payroll and retirement operate within a tightly synchronized technology environment.
An ESI-associated MEP may be more relevant when the employer also wants payroll, HR, employee benefits, workers’ compensation, compliance, and broader employer administration addressed through the PEO.
The scopes are different, so the prices should not be compared as equivalent products. Gusto Retirement’s pricing page, updated July 6, 2026 and showing pricing applicable from February 23, 2026, lists Starter at $49 per month plus $6 per active participant, Core at $119 plus $8 per active participant, and Premium at $179 plus $8 per active participant. Participant account fees and other circumstances can also affect the total cost.
An ESI proposal can encompass a much broader set of PEO services. Employers should isolate retirement costs first and then compare the economics of the complete employment environment.
Potentially, depending on the ESI arrangement being proposed and whether the employer wants to retain its existing retirement plan. Guideline currently supports a self-service retirement option for employers not using Gusto Payroll, so the retirement product is not inherently limited to Gusto payroll customers.
ESI currently promotes its own MEP, so employers should determine whether retaining Guideline or moving into the ESI plan creates the better administrative, financial, and employee outcome.
Guideline / Gusto 401(k) is a credible specialized retirement solution with increasingly strong integration into Gusto’s broader payroll and benefits environment. Current Gusto Payroll customers can manage retirement alongside payroll, with synchronized deductions and contributions and a more unified employer experience.
The current Starter, Core, and Premium structures also give small employers several retirement-plan approaches, while delegated 3(16) and 3(38) services can reduce portions of the administrative and investment-management burden when the applicable services are selected.
For an employer whose broader HR and employment infrastructure already works well, that may be exactly the right solution. There is little reason to restructure payroll, benefits, workers’ compensation, and HR simply because leadership wants a better retirement plan.
ESI becomes more relevant when retirement is part of a broader operating challenge. Payroll, HR support, employee benefits, workers’ compensation, compliance, risk, and workforce administration may all be under review at the same time.
The decision should therefore not come down to whether Guideline or ESI “has a 401(k).” Both provide a retirement pathway, but they are proposing different scopes of relationship.
Guideline / Gusto 401(k) should earn its place through retirement technology, plan design, payroll connectivity, administration, investment services, fiduciary options, and participant experience. ESI should earn the broader employer relationship by demonstrating that connecting retirement with payroll, HR, benefits, workers’ compensation, compliance, risk, and service ownership creates a measurable improvement for the business.
Get a Direct PEO and Retirement Comparison
If you are researching Guideline alternatives, Guideline competitors, Guideline 401(k) alternatives, Gusto 401(k) alternatives, Gusto 401(k) powered by Guideline, small-business 401(k) providers, retirement-platform alternatives, payroll-integrated 401(k) plans, PEO 401(k), or Guideline vs. ESI, begin by identifying the scope of the employer’s problem.
If retirement is the primary issue, compare plan design, matching, Safe Harbor options, fiduciary responsibilities, investment services, administration, payroll integration, employee experience, technology, fees, and transition requirements.
If leadership is also evaluating payroll, HR, health benefits, workers’ compensation, compliance, risk management, and workforce technology, expand the evaluation to the complete employer-services structure. Determine which responsibilities the company wants to retain, which it wants to outsource, and where internal employees are still coordinating outside providers.
Trademark and Comparison Disclaimer:
Guideline, Gusto, Gusto 401(k), Gusto Retirement Services, Gusto Investment Services, and other company, service, and product names are the property of their respective owners. This comparison is provided for educational purposes and is not affiliated with or endorsed by Guideline or Gusto. Retirement-plan features, pricing, fiduciary services, investments, payroll integrations, tax requirements, PEO services, employee benefits, workers’ compensation arrangements, and contractual responsibilities can change and may vary by employer. Employers should review current plan documents, fee disclosures, investment disclosures, written proposals, and qualified retirement, tax, legal, or investment guidance before making a decision.
Still doing your own payroll? Tasks involved with Payroll and Employee Administration are purely transactional events.
At eESI, our business is all about assisting with the management of any organization’s most valuable resource: people.
A benefit package can be a major incentive to lure the best new talent to your workforce and keep your current employees happy.
Risk is a basic part of business. As a co-employer we work to eliminate, mitigate or share your associated legal liabilities.
eESI continuously utilizes the latest in technological advances through online and mobile solutions to make your life easier.
Still doing your own payroll? Tasks involved with Payroll and Employee Administration are purely transactional events.
At ESI, our business is all about assisting with the management of any organization’s most valuable resource: people.
A benefit package can be a major incentive to lure the best new talent to your workforce and keep your current employees happy.
Risk is a basic part of business. As a co-employer we work to eliminate, mitigate or share your associated legal liabilities.
ESI continuously utilizes the latest in technological advances through online and mobile solutions to make your life easier.
