To ask your employer to withhold an additional amount each pay period, complete lines 3, 4, and 5 on Form IT-2104, as applicable. Tax Withholding Forms and Instructions.Federal Withholding Certificate (W-4). To claim exempt status, you must meet certain conditions and submit a new Form W-4 and a notarized, unaltered Withholding Certificate Affirmation each year. Every employee must complete two withholding forms: For federal taxes: the W-4 Employee's Withholding Certificate form filed with the Internal Revenue Service. Every employee is required to complete a federal Withholding Allowance Certificate (W-4), which can also be utilized for state and local withholdings. You can update your tax information anytime your tax situation changes and you choose to have more, or less, tax withheld. The employee must send the Form W4 and statement directly to the IRS office designated on the lockin letter. Employee's Withholding Certificate. Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay.