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 Message Thank you! Oops! Related Content Put It in a Letter A letter of instruction provides additional and more personal information regarding your estate. When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Retirement Plan Choices for Small Businesses Retirement choices can be intimidating. Picking the right strategy.