A common question for people planning their estates or inheriting property is: For tax purposes, what’s the “cost” (or “basis”) an individual gets in property that he or she inherits from another? This is an important area and is too often overlooked when families start to put their affairs in order. Under the fair market value basis rules (also known as the “step-up and step-down” rules), an heir receives a basis in inherited property that’s equal to its date-of-death value. So, for example, if your grandfather bought shares in an oil stock in 1940 for $500 and it was worth $5 million at his death, the basis would be stepped up to $5 million for your grandfather’s heirs. That means all of that gain escapes income taxation forever! The...