A Professional Employer Organization (PEO) provides extensive human resource and administrative support services, often much more affordably, through a co-employment relationship with its clients. PEO clients benefit from the PEO having legal responsibility for payroll tax filings, deposits, reporting, and certain other legal compliance matters. The PEO arrangement also offers clients reduced exposure to rate fluctuations in workers' compensation premiums and unemployment tax rates, since the PEO manages a large collective pool of employees with its team of claims management professionals and worksite investigators to aggressively manage each claim far beyond the resources and attention most employers could ever pay to such matters.