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 Retirement Plan Detectives A couple become Retirement Plan Detectives, searching records from old employers. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. Asset Allocation Consider how your assets are allocated and if that allocation is consistent with your time frame and risk tolerance.