[May 17, 2019] Effective November 1, 2019, Oklahoma will increase its remote seller threshold. In place of the prior $10,000 threshold, remote sellers who have made taxable sales of $100,000 or more during the current or preceding calendar year must collect and remit tax. The obligation to collect tax begins on the first calendar month following the month where the seller passes the threshold.
The full text of the relevant bill can be found here.