Simplifying employment since 2000 

From a small startup to a company with hundreds of clients and thousands of managed employees.


In 2000, Michael Bulgarelli founded CoStaff Services, which today is one of Michigan’s largest Professional Employer Organizations (PEOs), servicing clients throughout southeast Michigan, across the state and around the country. When Michael started the company, he asked himself, “If I were the client, how would I build the service offering?” and designed CoStaff Services around the answers to that simple question. 

CoStaff has since evolved to servicing hundreds of clients and managing thousands of employees — many of which have been with CoStaff since its inception. Today, our seasoned team of experts and professionals averages 15 years of experience in their respective fields. 

In 2007, CoStaff launched CoStaff Benefit Services, an employee benefit agency servicing its PEO clients, as well as benefits-only clients that work direct to the insurance carriers. This expanded our service offering to now be able to offer employee benefits only.

Our mission is to provide best-in-class services and products, beginning with a state-of-the-art HRIS platform in PrismHR and extending through volume purchasing power that allows our clients to attain Fortune-500 benefits offerings through BlueCross BlueShield, Blue Care Network, Unum, Captrust, Omega Benefit Strategies and other elite institutions. 

We’ve learned that a people strategy makes all the difference. It takes people who are engaged and motivated to get the job done right day after day for a company to thrive and grow. Our proven approach allows companies to mitigate costs and risk by leveraging CoStaff Services’ HR infrastructure to become more efficient and profitable. 

Established In
Average Years of Service
% Client Satisfaction

Why Us

CoStaff Services simplifies employment administration whether you are looking for a PEO, HRO, or employee benefits provider; our customized solutions are tailored to your needs.

  • Payroll and tax administration

  • Personalized benefits administration

  • Flexible spending accounts

  • 401K

  • Pay-as-you-go workers’ compensation

  • Unemployment administration 

  • Mastered degree human resource services

Your Full-Service HR Team

Every client is equipped with a core team of individuals based on their unique HR needs.

HR Business Partner
HR Generalist
Payroll Specialist
Benefits Consultant
Account Manager
Safety & Risk Consultant
Our Vision

We simplify employment by creating quality relationships with small and medium sized businesses to provide single source expertise in managing payroll, HR, benefits, risk management and compliance.

Our Mission 

We are firmly committed to providing benchmark quality, service, employee benefits and advanced technology to ensure the utmost client satisfaction.

The amount of administration time and expertise CoStaff takes off my plate is remarkable. Now I can spend that time, focus and resources on growing my business.

Tom N.

Ready to offload your HR admin work?

Contact Us
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Simplify employment