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 Question Thank you! Oops! Related Content When Does Your Personal Car Become a Commercial Vehicle? At what point can you call a personal vehicle commercial? The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Buying vs. Leasing a Car Whatever your relationship with your car, it may eventually come time for a new one. Familiarize yourself with your options.