An Illinois man who argues the state illegally docked him more than $500,000 in estate taxes has taken his claims to the nation’s highest court.Paminder S. Parmar, who contests the $560,000 he paid on his mother’s $5 million estate, has asked the U.S. Supreme Court to look at his claims after the state’s top court rejected them this spring.Parmar had argued the tax law was illegally retroactive because it …