W-9 payments have to be made within one week of the pay. Form W-2 should be mailed after the payment period has ended. Instructions for completing Form W-2 & Form W-9 — Instructions for completing Form W-2 and Forms W-9-01, W-2G, W-9F will be available shortly — (PDF) Nov 26, 2024 — The Indiana Department of Revenue (IDR) has approved the following services as eligible for IDR's online vendor payment services: Form W-9 (W-9) & direct deposit (Direct Debit) with any vendor that provides a valid and current vendor payment account (IDR's Online Services). These services will start on November 28, 2018.