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. Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content Should I Buy or Lease an Auto? This calculator compares the financial impact of leasing versus buying an automobile. 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." Four Steps to Valuing an Estate Determining the value of your estate, or for someone who has passed away, can be a complex undertaking.