Oklahoma Income Tax Withholding Payment and Filing Requirements
Employers in Oklahoma must conform with these state rules relating to filing income tax withholding returns.
Periodic Returns. Quarterly (Form OW-9) by the 20th day of month following end of quarter. Monthly deposits (Form OW-9) are required by 20th day of following month if more than $500 is withheld per quarter.
Employers owing an average of $10,000 or more per month in taxes in the previous fiscal year must deposit amounts withheld according to the federal semiweekly deposit schedule. Employers required to remit federal withholding under the federal semiweekly deposit schedule must pay withheld amounts on the same dates as required for federal withholding taxes.
If the tax withheld was $5,000 or more per month in the previous fiscal year, an employer must file returns electronically.
Annual Reconciliation Returns. Not required.