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. Related Content My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates. Leaving Your Lasting Legacy Want to do more with your wealth? You might want to consider creating a charitable foundation. You May Need to Make Estimated Tax Payments If… Have income that isn’t subject to tax withholding? Or insufficient withholdings? You may have to pay estimated taxes.