Suppliers with grant-related contracts must contact the agency providing the grant in order to have their payment address updated. The supplier will need to provide a new KC W-9 for tax identification verification.

Suppliers with contracts with King County must have an spend-authorized account in the E-Procurement Supplier Portal. Once that is set up, suppliers can maintain their payment information through the Supplier Portal. If the supplier does not have a spend-authorized account, they can set one up with the following steps.

1. Register in the Supplier Portal if they have not already done so.
2. Attach a IRS W-9 to their Supplier Portal account for tax identification verification.
3. Contact the Procurement & Payables employee who manages the contract, and request that the supplier profile is promoted to "spend authorized". To find the name of the Procurement & Payables employee, look up the contract on the Awarded Contracts Log. 
4. Once the account is promoted to spend authorized, the supplier can manage their payment address through their account.