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Who Uses SIGMA

SIGMA VSS: Doing Business with the State

The State of Michigan implemented SIGMA to improve budgeting processes, accounting activities, payments, receiving bids, and providing grant opportunities. SIGMA Vendor Self-Service (VSS) improves working with vendors, payees and grantees.


Did you know?

In Spring 2024, Vendor Self Service (VSS) will have a new, streamlined user experience with the launch of SIGMA 4! After the upgrade, you will notice a more efficient and intuitive user interface as well as new functionality to support you. Watch for more information in the coming months.

Vendor Self-Service Fact Sheet

 Not Registered?

You can register in SIGMA VSS to receive payments and respond to business opportunities.

Currently Registered?

You will need to claim your account to respond to opportunities, see financial transactions, or update your address and personal information.

Need More Information?

Use the Quick Reference Guides or Vendor Tutorials below to assist with claiming your VSS account, registering as a new vendor, or seeing your payments.

Use the SIGMA VSS home page to find even more helpful information by clicking the link below.


Don't Miss Out on Opportunities: Add Commodity Codes to Your Account

With SIGMA Vendor Self-Service, vendors can receive email notifications for solicitations posted for goods and services that match the commodity codes they have associated with their business.

To receive email notifications based on NIGP commodity codes:

Vendors should log into their account and go to the Commodities tab. On the Commodities tab, vendors can then search and select Commodity/Service Codes that apply to their account. After Commodity/Service Codes are added vendors will receive email notification as solicitations post with the selected Codes. Please confirm that your SIGMA Vendor Self-Service account has the most up to date email address to make sure you do not miss out on these opportunities.

HFA AND AFC Registration Testing Requirement Reimbursements

Homes for the aged (HFA), larger adult foster care facilities (AFC), and skilled nursing facilities serving 13 or more individuals may receive financial support for testing of residents and staff through orders issued by the Department of Health and Human Services (DHHS). HFAs and AFCs meeting the requirements must register in SIGMA as a vendor to receive reimbursements. DHHS will use SIGMA to process payments to eligible HFAs and AFCs.

Vendors needing to register should review the tutorial titled SIGMA VSS Register New Account Registration for Grants below, and visit the SIGMA VSS website to begin the process.

SIGMA Support

A Vendor Support Call Center is available to assist by calling 517-284-0550 or toll free at 888-734-9749 or emailing


Who Uses Vendors


Vendors who wish to do business with the state can sign up for SIGMA and begin the process of bidding for contracts.
Who Uses Individuals


Individuals can use SIGMA to track payments sent to them from the State. Sole Proprietors are also able to use the system.
Who Uses Grantees


Those who have been granted a reward by the State can view their demographic and payment information on SIGMA.
Who Uses SIGMA


SIGMA provides user-friendly and simple means to manage solicitations for government agencies.