Estate Management 101 A will may be only one of the documents you need—and one factor to consider—when it comes to managing your estate. Related Content Where Will Your Retirement Money Come From? Retirement income may come from a variety of sources. Here's an overview of the six main sources. What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates.