Should I Pay Off Debt or Invest? This calculator will help determine whether you should invest funds or pay down debt. 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 Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Prescription Drug Benefits Under Medicare (Part D) Do you need to enroll in Medicare Part D? Read this article to learn more about whether you need this coverage Tax Deductions You Won't Believe Here are some examples of deductions from the IRS that were permitted and some that were, uh, too creative.