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 | Related Content Do You Feel Lucky? Recent changes in estate tax laws could affect the strategy you have in place. Yours, Mine and Ours: Estate Strategies for Second Marriages Second marriages are a trigger event to revisit any existing estate strategies. Principles of Preserving Wealth How federal estate taxes work, plus estate management documents and tactics.