Since 1977, less than 2 percent of adults who die each year have typically left estates large enough to be taxable. Because of recent increases in the amount of an estate
that is exempt from taxation, a relatively small percentage of estates are taxable today. In 2007, 17,400 taxable estate tax returns were filed; most were for deaths in 2006, representing about 0.7 percent of adult deaths in that year. The average tax rate for taxable estates—calculated as the estate tax liability divided by the value of the net taxable estate (the value minus certain deductions, such as charitable bequests and bequests to a spouse)—has remained near 25 percent since the 1940s, even as the share of estates subject to the tax fluctuated because of changes in the value of the effective exemption amount.
Source:
CBO