Companies use the information collected on W-9’s (or substitutes) to produce a Form 1099. This document details the earnings that the independent contractor received that tax year from that specific client. Professional Payroll and HR outsource organization, our clients rely on us to help them effectively deal with these kinds of topics. IRS, our clients rely on us to help them effectively deal with these kinds of topics. As a Professional Payroll and HR outsource organization, but it’s saved by the filer as backup documentation for verification purposes.