Step 3: Register for SIGMA
The below Enrollment Types must have their Social Security Number (SSN) or Employer Identification Number (EIN)/Tax Identification Number (TIN) enrolled with SIGMA Vendor Self Service (VSS) prior to starting the enrollment process in CHAMPS. www.Michigan.gov/SIGMAVSS
- Individual/Sole Proprietor
Rendering/Servicing only Enrollment Type does not have to register with SIGMA.