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 When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Choosing a Retirement Plan that Fits Your Business To choose a plan, it’s important to ask yourself four key questions. The Utility of Sector Investing Successful sector investing is dependent upon an accurate analysis about when to rotate in and out.