Find Withholding Tax forms, resources and publications. Complete your amended return as if you are filing the return for the first time.Submit all the forms relevant to the information in your amended return. 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. Child Support Forms ; 4-8c. Find out what adjustments and deductions are available and whether you qualify. States. Notes : See coming into force provision and notes, where applicable. Shaded provisions are not in force. Help. Immigrants who are interested in becoming U.S. citizens.