Students are NOT exempt from paying taxes. Your college student son is subject to the same tax laws that everyone else is subject to. If he is being claimed as your dependent, then you are getting the $4050 personal exemption for him; any income he received over $6300 is taxable.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**