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 Infographic: Women Are Financially Savvy Women Are Financially Savvy. Yet, there are still unique challenges working against women in retirement. Password Protection Strategies Simple steps may help you foil hackers and protect your privacy. 18 Years’ Worth of Days The average retirement lasts for 18 years, with many lasting even longer. Will you fill your post-retirement days with purpose?