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 When Should You Take Social Security Monthly Social Security payments differ substantially depending on when you start receiving benefits. Retirement Planning With Your Special Needs Child in Mind Having a special needs child adds another layer of complexity to retirement planning. A special needs trust may help. Tax-Advantaged Retirement Planning Reduce your tax liability in retirement.