This publication contains general information regarding the withholding of Virginia income tax from wages. Completing the VA-4.The Virginia income tax withholding exemption certificate is the Form VA-4. U.S. companies should not withhold taxes from money paid to independent contractors working overseas. Electing an Arizona Withholding Percentage – Completing Arizona Form A‑4. Each business must apply for a license. Applicable taxes are paid in the commissioner of the revenue's office.