Best PEO Companies in Montana
Compare Professional Employer Organizations serving Montana businesses. Editorial ratings are independent — featured placements are paid visibility, not endorsements.
PEO Companies Serving Montana
Justworks
New York, NY · Est. 2012
Insperity
Kingwood, TX · Est. 1986
TriNet
Dublin, CA · Est. 1988
ADP TotalSource
IRS CPEO ✓ESAC ✓NationwideHQ: Roseland, NJ · Est. 1996
ADP TotalSource is the Professional Employer Organization division of ADP (NASDAQ: ADP), one of the world's largest payroll and HR companies with over 75 years of history and more than 1.1 million clients across 140+ cou…
Rippling
NationwideHQ: San Francisco, CA · Est. 2016
Rippling is a San Francisco-based workforce management platform and PEO founded in 2016 by Parker Conrad and Prasanna Sankar.
Oasis, a Paychex Company
IRS CPEO ✓NationwideHQ: Sarasota, FL · Est. 1996
Oasis, a Paychex Company, is a full-service Professional Employer Organization formed through Paychex's 2018 acquisition of Oasis Outsourcing — one of the largest privately held PEOs in the country at the time, serving o…
Engage PEO
IRS CPEO ✓ESAC ✓NationwideHQ: Hollywood, FL · Est. 2011
Engage PEO is a Hollywood, Florida-based IRS CPEO certified Professional Employer Organization founded in 2011.
CoAdvantage
IRS CPEO ✓NationwideHQ: Bradenton, FL · Est. 1997
CoAdvantage is a Bradenton, Florida-based Professional Employer Organization founded in 1997.
Infiniti HR
NationwideHQ: Rockville, MD · Est. 2008
Infiniti HR is a Burtonsville, Maryland-based IRS CPEO certified Professional Employer Organization founded in 2004.
Employer Flexible
RegionalHQ: Houston, TX · Est. 2003
Employer Flexible is a Houston, Texas-based Professional Employer Organization founded in 2003 by Michael Hopkins, Chris Dollins, and Michael Greathouse.
FrankCrum
NationwideHQ: Clearwater, FL · Est. 1981
A family-owned PEO based in Florida serving businesses nationwide with 2-500 employees. FrankCrum is one of the few PEOs with its own insurance company, enabling highly competitive workers comp rates.
PrestigePEO
IRS CPEO ✓ESAC ✓NationwideHQ: Melville, NY · Est. 1998
PrestigePEO is a national Professional Employer Organization headquartered in Melville, New York, serving small and mid-sized businesses across all 50 states since 1998.
Rocky Mountain PEO
RegionalHQ: Denver, CO · Est. 2002
A Denver-based PEO serving the Mountain West region. Rocky Mountain PEO combines local regulatory expertise with strong technology sector support.
Northwest PEO
IRS CPEO ✓RegionalHQ: Seattle, WA · Est. 1999
A Seattle-based PEO serving the Pacific Northwest. Northwest PEO has deep expertise in Washington state employment law and the technology sector.
Concurrent HRO
IRS CPEO ✓RegionalHQ: Broomfield, CO · Est. 2018
Concurrent HRO was a Denver, Colorado-based IRS CPEO certified and ESAC accredited Professional Employer Organization.
HR Resourcing
IRS CPEO ✓RegionalHQ: Englewood, CO · Est. 2005
HR Resourcing is an IRS CPEO certified Professional Employer Organization serving small and mid-sized businesses across the United States.
InTandem Human Resources
IRS CPEO ✓RegionalHQ: Denver, CO · Est. 2010
InTandem HR is a Denver, Colorado-based IRS CPEO certified Professional Employer Organization founded in 2010 by Monica Denler, President and CEO.
OnePoint HRO
IRS CPEO ✓RegionalHQ: Englewood, CO · Est. 2005
OnePoint HRO is an Englewood, Colorado-based IRS CPEO certified Professional Employer Organization founded in 1999.
IntelliPro
IRS CPEO ✓NationwideHQ: San Jose, CA · Est. 2009
IntelliPro is an IRS-certified PEO headquartered in San Jose, California, specializing in HR outsourcing, payroll administration, and employee benefits management for technology companies and professional services firms…
Paychex PEO
IRS CPEO ✓ESAC ✓NationwideHQ: Rochester, NY · Est. 1971
Paychex PEO is the co-employment division of Paychex (NASDAQ: PAYX), one of the largest HR and payroll companies in the United States with over 50 years of experience serving American businesses.
BBSI
ESAC ✓NationwideHQ: Vancouver, WA · Est. 1965
Barrett Business Services, Inc. (BBSI) is a publicly traded (NASDAQ: BBSI) Professional Employer Organization headquartered in Vancouver, Washington.
Adams Keegan
IRS CPEO ✓ESAC ✓NationwideHQ: Memphis, TN · Est. 1987
Adams Keegan is a Memphis, Tennessee-based PEO offering both co-employment (PEO) and administrative services organization (ASO) models.
Deel PEO
NationwideHQ: San Francisco, CA · Est. 2019
Deel PEO is the domestic U.S. co-employment offering from Deel, a San Francisco-based global HR and payroll platform founded in 2019 and valued at $16.8 billion following a $450 million Series G in May 2025.
AlphaStaff
ESAC ✓NationwideHQ: Sunrise, FL · Est. 1997
AlphaStaff is a Sunrise, Florida-based Professional Employer Organization founded in 1997 and ESAC accredited.
Vensure Employer Services
NationwideHQ: Chandler, AZ · Est. 2004
Vensure Employer Services is one of the largest privately held PEOs in the United States, headquartered in Chandler, Arizona, and founded in 2004.
America's Back Office
IRS CPEO ✓NationwideHQ: Chandler, AZ · Est. 2000
America's Back Office is an IRS CPEO certified and ESAC accredited PEO headquartered in Chandler, Arizona, providing comprehensive HR outsourcing services to small and mid-sized businesses across the United States.
Avitus Group
NationwideHQ: Billings, MT · Est. 1994
Avitus Group is a Billings, Montana-based PEO and HR outsourcing company founded in 1994, providing payroll processing, employee benefits, workers' compensation, and HR services to businesses nationwide.
Modern Business Associates
NationwideHQ: Tampa, FL · Est. 1990
Modern Business Associates (MBA) is a Tampa, Florida-based PEO founded in 1990, providing co-employment services including payroll processing, employee benefits, HR administration, workers' compensation, and compliance s…
Simploy
RegionalHQ: Boise, ID · Est. 2008
Simploy is a Boise, Idaho-based PEO providing co-employment services including payroll, employee benefits, HR administration, workers' compensation, and compliance support to small and mid-sized businesses across the Mou…
Proservice National
NationwideHQ: Honolulu, HI · Est. 2010
Proservice National is the mainland U.S. PEO extension of ProService Hawaii, providing co-employment services including payroll, benefits, HR administration, and compliance support to businesses across the continental Un…
Regis HR Group
ESAC ✓NationwideHQ: Tampa, FL · Est. 2002
Regis HR Group is a Tampa, Florida-based national PEO providing co-employment services including payroll processing, employee benefits, HR administration, workers' compensation, and compliance support to businesses acros…
Stratus HR
NationwideHQ: South Jordan, UT · Est. 2003
Stratus HR is a South Jordan, Utah-based PEO (operating as ISI HR) providing comprehensive co-employment services to small and mid-sized businesses nationwide.
Tilson HR
RegionalHQ: Portland, OR · Est. 1999
Tilson HR is a Portland, Oregon-based PEO founded in 1999, providing payroll, employee benefits, HR administration, and compliance services to growing businesses across the Pacific Northwest and Western United States.
INVO PEO
NationwideHQ: Tampa, FL · Est. 2010
INVO PEO is a Tampa, Florida-based Professional Employer Organization providing co-employment services including payroll processing, employee benefits, HR administration, workers' compensation, and compliance support to…
SinglePoint Outsourcing
NationwideHQ: Scottsdale, AZ · Est. 2007
SinglePoint Outsourcing is a Scottsdale, Arizona-based PEO providing national co-employment services including payroll, employee benefits, HR administration, and compliance support to small and mid-sized businesses acros…
NetPEO
NationwideHQ: Atlanta, GA · Est. 2009
NetPEO is an Atlanta, Georgia-based PEO broker and provider offering co-employment services and PEO matching to businesses nationwide.
Associated Employers
RegionalHQ: Billings, MT · Est. 1945
Associated Employers is one of Montana's oldest HR service organizations, headquartered in Billings and founded in 1945.
Innoworks Employment Services
RegionalHQ: Salt Lake City, UT · Est. 2005
Innoworks Employment Services is a Salt Lake City, Utah-based PEO providing co-employment services including payroll, employee benefits, HR administration, and compliance support to businesses in the Mountain West region…
PrimePay
NationwideHQ: West Chester, PA · Est. 1986
PrimePay is a West Chester, Pennsylvania-based payroll and PEO services company founded in 1986, providing co-employment services and payroll administration to small and mid-sized businesses nationwide.
Summit HR
RegionalHQ: Salt Lake City, UT · Est. 2004
Summit HR is a Salt Lake City, Utah-based PEO providing co-employment services to businesses across the Mountain West.
Creative Business Resources
RegionalHQ: Denver, CO · Est. 1991
Creative Business Resources is a Denver, Colorado-based PEO founded in 1991, providing co-employment services to businesses across the Mountain West and Central Plains.
Prism HR
NationwideHQ: Hopkinton, MA · Est. 1996
PrismHR is a Hopkinton, Massachusetts-based HR technology platform and PEO services provider founded in 1996.
Choosing a PEO in Montana
Montana's minimum wage is $10.85 per hour as of January 1, 2026, adjusted annually for inflation based on the Consumer Price Index. Overtime is paid at 1.5 times the regular rate for hours worked over 40 in a week. Montana allows no tip credit, meal credit, or training wage under its wage and hour law — tipped and trainee employees must still receive the full state minimum wage.
Montana stands alone nationally on one point: it is the only U.S. state that is not an at-will employment state. Under the Wrongful Discharge from Employment Act (WDEA), once an employee completes a probationary period (12 months by default, unless the employer specifies otherwise), an employer must have good cause to terminate them. This single statute reshapes how termination decisions, documentation, and personnel policies need to work in Montana compared to every other state, and it is the single most important thing an out-of-state employer needs to understand before hiring there.
Montana requires PEOs to be licensed by the Department of Labor and Industry, which regulates both professional employer arrangements and employee leasing arrangements under a dedicated licensing program. Workers' compensation insurance is required for most Montana employers, available through the Montana State Fund, a private insurer, or approved self-insurance. Montana has no state-level mini-WARN law, relying on the federal WARN Act's 100-employee threshold.
Montana's final paycheck rule is among the strictest in the country: discharged employees must be paid immediately — within four hours or by the end of the business day, whichever comes first — unless the employer has a pre-existing written policy extending this to the next payday or 15 days, whichever is sooner. Employees who quit must be paid by the next scheduled payday or within 15 days, whichever comes first. A PEO with Montana expertise is especially valuable here, given the WDEA's good-cause termination standard and the state's fast final-pay deadlines. Use the form on this page to connect with PEOs serving Montana businesses.
Already working with a PEO and considering a switch? PEO Alternatives has independent comparisons of the top providers to help you evaluate your options.
Frequently Asked Questions
What is the minimum wage in Montana in 2026?
Montana's minimum wage is $10.85 per hour as of January 1, 2026, adjusted annually based on the Consumer Price Index. Montana does not allow a tip credit, meal credit, or training wage, so tipped and trainee employees must still receive the full state minimum wage.
Is Montana an at-will employment state?
No, and it is the only U.S. state that is not. Under Montana's Wrongful Discharge from Employment Act, once an employee completes a probationary period (12 months by default), an employer must have good cause to terminate them. This significantly changes how termination decisions and documentation need to be handled compared to every other state.
Does Montana require PEOs to be licensed?
Yes. Montana requires PEOs to be licensed by the Department of Labor and Industry, which regulates both professional employer arrangements and employee leasing arrangements. Businesses can verify a PEO's license status directly with the department before signing a contract.
When must Montana employers pay a departing employee's final wages?
For discharged employees, Montana requires final wages to be paid immediately, within four hours or by the end of the business day, whichever comes first, unless a written company policy extends this to the next payday or 15 days. Employees who quit must be paid by the next scheduled payday or within 15 days, whichever comes first.