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 Tax Freedom Day Assess how many days you'll work to pay your federal tax liability. Replacing Your Medicare Card Learn how to replace your lost, stolen, or damaged Medicare card in this helpful article. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates.