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. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. Earnings for All Seasons Earnings season can move markets. What is it and why is it important?