If you’re planning your estate, or you’ve recently inherited assets, you may be unsure of the “cost” (or “basis”) for tax purposes.
Fair market value rules
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 equal to its date-of-death value. So, for example, if your grandfather bought ABC Corp. stock in 1935 for $500 and it’s worth $5 million at his death, the basis is stepped up to $5 million in the hands of your grandfather’s heirs — and all of that gain escapes federal income tax forever.
The fair market value basis rules apply to inherited property that’s includible in the deceased’s gross estate, and those rules also apply to property inherited from foreign persons who aren’t subject to U.S. estate tax. It doesn’t matter if a federal estate tax return is filed. The rules apply to the inherited portion of property owned by the inheriting taxpayer jointly with the deceased, but not the portion of jointly held property that the inheriting taxpayer […]