Principles of Preserving Wealth The slideshow presentation that you would like to view is too large for your current screen resolution. Click here to view to view the slideshow at full resolution. Launch Presentation » Share | Related Content When Do You Need a Will? When do you need a will? The answer is easy: Right Now. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. What's My Potential Estate Tax? This calculator helps estimate your federal estate tax liability.