Part 1 ā Complete this part to calculate your withholding allowances for New York State and Yonkers (line 1 of Form IT-2104). Complete Form IT-2104 each year and file it with your employer if the number of allowances you may claim is different from federal Form W-4 or has changed.The court has placed the most commonly used forms on line as a resource. Please be advised that the forms detailed below are intended to be a guide. Find out about your state taxesāproperty taxes, tax rates and brackets, common forms, and much more. Adjustments and deductions.