What's My Potential Estate Tax? This calculator helps estimate your federal estate tax liability. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Related Content Redefining Retirement Planning Millennials are redefining retirement planning. Understanding the Alternate Valuation Date Executors can value the estate on the date of death, or on its six-month anniversary —the “Alternate Valuation Date." Best Vacations: By Car, By Ship, By Foot, Once in a Lifetime Four vacation destinations you might never have thought of.