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 Saving for Retirement This calculator can help you estimate how much you may need to save for retirement. When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Home Mortgage Deduction Use this calculator to assess the potential benefits of a home mortgage deduction.