State sales tax
4.5% state, plus local option
Oklahoma's state rate is 4.5%, but cities and counties each add their own tax on top by local vote, so combined rates typically land between 8% and 11% depending on the exact COPO jurisdiction. The Tax Commission publishes a quarterly rate chart by jurisdiction, and a store not listed on it owes no local tax at all. Storeveu holds state-level rates that every store in Oklahoma inherits, with a per-store override so you can set the exact combined rate for your address.