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 Question Thank you! Oops! Related Content How Income Taxes Work A quick look at how federal income taxes work. Tax Efficiency in Retirement What role would taxes play in your investment decisions? It Was the Best of Times, It Was the Worst of Times All about how missing the best market days (or the worst!) might affect your portfolio.