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. Related Content 5 Benefits of Working in Retirement Here are 5 reason why you may consider working through retirement. 9 Facts About Retirement Regardless of how you approach retirement, there are some things about it that might surprise you. Put It in a Letter A letter of instruction provides additional and more personal information regarding your estate.