son had to pay taxes
son is 19, he worked for his father, single member LLC. He made a little over 25k and he said he had to pay over 1k in taxes. My thought was he would owe less or nothing. He did pay into the s.s. and medicare but not federal as per being a son in the business. Is there a certain way the w-4 or w-2 to be filled out? Did we do something wrong?