The Oklahoma Tax Commission has published the 2018 withholding tax tables as well as some additional Frequently Asked Questions relative to W-2 and W-3 filing.
The only change to the Withholding Tax Tables publication is that employers should use the number of withholding allowances claimed on the Oklahoma Form OK-W-4, rather than the number of allowances on the Federal W-4, in calculating and processing employee tax withholding.