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. Estimating Your Estate Taxes Estate tax laws have changed a few times in recent years. Do you know the new rules? Principles of Preserving Wealth How federal estate taxes work, plus estate management documents and tactics.