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 Comparing Mortgage Terms Estimate the total cost in today's dollars of various mortgage alternatives. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. How to Appeal Your Property Taxes For homeowners who think their property taxes are too high, there are ways to appeal.