Independent research on 215 HR & workforce products. Facts checked against vendors’ official documentation.

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ASO Services

Best ASO Services for Small Business

Small businesses choose an ASO when they want payroll, tax filing and benefits administration handled for them but prefer to stay the only employer and keep their own benefit plans and broker. Some ASOs set a minimum headcount or a monthly minimum fee, so check both before you ask for a quote.

products that fit
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By LeadChange Research TeamUpdated

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ASO services for small business

None of these products has enough verified facts for a LeadChange Score yet, so none is ranked: they are listed by the share of their facts we have verified. Prices are list prices as published by each vendor.

Filter by verified facts

  1. ADP Comprehensive Services

    ADP Comprehensive Services is ADP's modular HR outsourcing service for employers with 25 or more employees: designated HR, payroll, benefits and talent specialists on the ADP Workforce Now suite, while the business stays the sole employer of record.

    Pricing model
    Quote only
    Not scored yet11 of 23 facts verifiedFacts checked Oct 24, 2026
  2. C2 Essentials ASO

    C2 Essentials, based in Ashburn, Virginia, sells a PEO and an ASO aimed at government contractors.

    Pricing model
    Quote only
    Not scored yet10 of 23 facts verifiedFacts checked Oct 24, 2026
  3. Connor & Gallagher OneSource ASO

    Connor & Gallagher OneSource (CGO), founded in 1997 as an insurance agency, sells an ASO that bundles UKG Ready payroll and HRIS with HR management outsourcing, employee benefits, retirement plan services and workers' compensation, while the client remains the employer. UKG Ready is required and pricing is quoted.

    Pricing model
    Quote only
    Not scored yet10 of 23 facts verifiedFacts checked Oct 24, 2026
  4. Easeworks ASO

    Easeworks is a California HR outsourcing firm, operating since 2000, whose ASO keeps the client as sole employer while Easeworks runs payroll and tax support, HR administration, compliance workflows and reporting with a named HR partner.

    Pricing model
    Quote only
    Not scored yet10 of 23 facts verifiedFacts checked Oct 24, 2026
  5. XcelHR ASO

    XcelHR, a PEO serving small businesses for more than 30 years, also sells an ASO: the client remains employer of record, XcelHR files payroll taxes under the client's FEIN, and it adds HR compliance help, benefits arrangement and recruiting support on its cloud HR software. Prices are not published.

    Pricing model
    Quote only
    Not scored yet10 of 23 facts verifiedFacts checked Oct 24, 2026
  6. AsureWorks

    AsureWorks is Asure Software's managed payroll and HR administration service: Asure specialists run payroll, tax filing and reporting, records and onboarding on AsureCentral while the client remains employer of record with no co-employment. It does not bundle benefits, and pricing is quoted.

    Pricing model
    Quote only
    Not scored yet9 of 23 facts verifiedFacts checked Oct 24, 2026
  7. guHRoo ASO

    guHRoo (Executive Resource Group, South Carolina) publishes the price of its ASO plan, Professional Payroll & HR: $79 per employee per month with a $1,000 monthly minimum and an implementation fee of two months' billing.

    Pricing model
    Per employee
    Not scored yet8 of 23 facts verifiedFacts checked Oct 24, 2026

    From $79/employee/mo

LeadChange Score: editorial assessment based on public information.

All ASO services, ranked

How the score works

What matters for small business

  1. A fee that covers the basics

    Ask whether payroll, payroll tax filing and benefits administration are in the base fee or sold as add-ons; on a small headcount, add-ons can double the per-employee cost.

  2. HR answers without an HR team

    Check whether the plan includes an HR line or a dedicated advisor, and the hours they work, because the owner usually handles employee questions.

  3. Tax filing you can verify

    Your business stays liable for payroll taxes filed under its EIN, so ask how you can see each deposit and filing the provider makes.

More tools for small business

Find your fit

How we research

This ranking of ASO services for small business reweights the LeadChange Score: capability coverage 25%, pricing transparency & value 30%, integrations & API 10%, security & compliance 10%, fit & support 15%, and data confidence 10%. Only products with a verified fact showing they serve this segment are listed.

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