Oklahoma Form U-4 is a tax filing form used by the Oklahoma Tax Commission for collecting income tax withholding on wages paid to employees. It is also used to report certain types of payments to non-residents of Oklahoma. The Form U-4 has two different versions: Form U-4A for employers of household employees, and Form U-4B for employers of non-household employees. This form is used to report wage and salary payments, as well as payments for services provided by independent contractors. The form also includes information such as employee name, Social Security number, Oklahoma withholding amount, and other pertinent information. Employers must complete and submit the Oklahoma Form U-4 to the Oklahoma Tax Commission in order to comply with state tax laws and to ensure that the correct amount of income tax is withheld from employees’ wages.