The Amended Colorado Oil Shale Facility Severance Tax Return (DR 0020EX) is required to be used when correcting your Colorado Oil Shale Facility Severance Tax Return (DR 0020E).
The Amended Colorado Oil Shale Facility Severance Tax Return (DR 0020EX) is required to be used when correcting your Colorado Oil Shale Facility Severance Tax Return (DR 0020E).