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 | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Managing an Inheritance A windfall from a loved one can be both rewarding and complicated. Principles of Preserving Wealth How federal estate taxes work, plus estate management documents and tactics.