Professional employer organizations (PEO)

Professional employer organizations (PEOs) enable clients to outsource human resources management, employee benefits, payroll, workers’ compensation, and compliance.

Benefits, payroll, HR technology, and risk management are not core business functions to our partner clients. PEO services help you keep focused on your core business.

Payroll services include W-2 processing, tax filing services, direct deposit, wage garnishment, new hire reporting, standard & custom reports, HRIS, expense reporting, time & attendance, pay cards, pay-as-you-go workers comp, 401(k) administration, & unemployment cost control.

Benefits administration includes- annual plan and cost reviews, facilitating open enrollment and employee education, managing COBRA, HRA/ HSAs, FSAs and transit plans, bill payment/ premium reconciliation, online benefits enrollment, new hire additions, as well as life event-related plan enrollment changes.

Employer Services Organization (ESO)

Employer Services Organizations offer the same outsourcing services offered through a PEO. However, an ESO provides more support with business operations (ERTC, PPP assistance, tax assistance, organizational development, and strategic planning).

Payroll/State & Federal Tax Support

As an ESO/PEO, Idilus manages tax payments for the federal and state for most clients under a consolidated filing.

Our clients save an average of 100 hours per week and 21% on HR administration and compliance costs. Whether you have 10 employees or 100, turn to us to take on your payroll services. Let us sweat the details and ensure you stay on and get your team paid correctly and on time every time. We have detailed professionals who focus on developing processes and implementing tools to help manage day-to-day operations like time management and leave tracking. Your Idilus payroll team will help you understand the costs and benefits of compensation decisions and keep you on track to achieve your payroll goals. Most importantly, our team understands the importance of making sure you meet your pay promise to your team members. We can set you up to succeed.

Our tax team is intimately familiar with Illinois, Indiana, and Wisconsin state tax management.


An administrative services organization (ASO) is an organization that provides outsourced solutions to meet the administrative and HR needs of the client, with the client retaining all employment-related risks and liabilities. The principal difference between ASO services and PEO services is that, in an ASO arrangement, the employer remains the employer of record for tax purposes. Ultimately, with this structure, tax and insurance filings are done through the administrative firm but under the client company’s employer identification number.


Human Resources Organizations (HROs) enable clients to outsource the management of human resources. HROs may be asked to assume the responsibility for benefit programs and workers’ compensation. However, if the HRO runs payroll, it will be under the client company’s EIN. In an HRO arrangement, the client company retains its EIN, files its tax returns, and maintains benefit plans in its name.

Custom Built Services

Our clients turn to us for best practices. We support and empower you by offering a comprehensive group of talented team members who listen to your needs and help create solutions to the changing challenges of business.

Call our office at (630) 614-7310 to speak with someone on our team

Idilus has been in business since 1999 and values every one of our clients. We specialize in payroll, benefits management, HR outsourcing, risk management, compliance and more.