Oklahoma Tax Commission
Gross Production Registration System
Within this packet you will find information regarding system registration, instructions
for filing the 320-A and 320-C, along with screen shots of the system. If at any time
during the registration process a user should need assistance, please contact the OTC
Webfile Support group at email@example.com. Once registered, if assistance is
needed, please call the OTC’s Taxpayer Assistance Division at (405) 521-3674.