FYI to anyone stumbling on this thread. The requirements for the exemptions as per the yearly guideline PDF they put out is NOT accurate. The wording, at the very least is non-descript, if not outright deceptive.
See Okla. Admin. Code § 710:50-15-2 to see the actual wording. Even then, it doesn't seem to align with how the Oklahoma Tax Commission is applying the code; I've been hearing from both friends and family that the state of Oklahoma, years after (4 years, in my brother's case) have come back, requiring they pay the money back because "They did not work for the Cherokee Nation." (in our case)
The wording of the PDF and the wording of the admin code, in my layman's understanding, does not state that you need to work FOR the Tribe, just that the place you're working has to be under Tribal jurisdiction.
Watch yourself and take care, friends.
