Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. 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 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 Is My Life Expectancy? Estimate how many years you may need retirement assets or how long to provide income to a surviving spouse or children. Deciding When to Take Social Security One of the most common questions people ask about Social Security is when they should start taking benefits.