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 Comparing Mortgage Terms Estimate the total cost in today's dollars of various mortgage alternatives. What Smart Investors Know Savvy investors take the time to separate emotion from fact. Jane Bond: Infiltrating the Market Agent Jane Bond is on the case, cracking the code on bonds.