The best reason why someone would want to claim the Earned Income Tax Credit (EITC) on their taxes is that it reduces the amount of taxes that qualifying workers need to pay, and can even result in a substantial tax refund. This credit is designed to benefit low- to moderate-income working individuals and families, especially those with children, by lowering their federal tax burden and potentially giving back money as a refund if the credit exceeds their tax liability. This financial support can significantly improve the disposable income and overall financial stability of eligible taxpayers.