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. Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Life and Death of a Twenty Dollar Bill How long does a $20 bill last? How Compound Interest Works Use this calculator to better see the potential impact of compound interest on an asset. Thanks, Mom! When it comes to managing your personal finances, there’s plenty of complex advice out there. But often, simpler is better.