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 Content When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Critical Estate Documents Sound estate management includes creating financial and healthcare documents. Here's an inside look. Principles of Preserving Wealth How federal estate taxes work, plus estate management documents and tactics.