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. Related Content Retirement Traps to Avoid Beware of these traps that could upend your retirement. Saving for Retirement This calculator can help you estimate how much you may need to save for retirement. 4 Steps to Protecting a Child with Disabilities Planning for a child with special needs can be complicated, confusing, and even overwhelming.