The Withholding Calculator (link below) is a tool on IRS. Complete Form W4 so that your employer can withhold the correct federal income tax from your pay.Benefits of submitting form W-4 electronically. Your original withholding choice will remain in effect until you file a new IRS W-4P form or California DE-4P tax withholding election form with OCERS. Employee's Withholding Allowance Certificate. Complete this form so that your employer can withhold the correct California state income tax from your pay. OCERS offers a full compliment of online and printable forms for its members and employers to assist with the various changes in one's career and life. Employers contribute to Unemployment Insurance (UI) and Employment Training Tax (ETT). This form explains how much money to withhold for federal income taxes. Note that employees can fill out a new Form W-4 when applicable.