If you are concerned that your employer is improperly withholding or failing to withhold federal income and employment taxes you should report your employer by contacting the IRS at 1-800-829-1040.
Employers. Employers are required by law to withhold employment taxes from their employees. Employment taxes include federal income tax withholding and Social Security and Medicare Taxes.
To register for both an income tax withholding account with the Department of Revenue and an unemployment insurance account with the Department of Economic Security, the employer will need to complete the JT-1 application on AZTaxes or complete the form and return the completed form to the department.