Graduate courses are tax free under old law if they advance your current profession. For example, as a CPA I can take graduate tax courses and not be penalized. But I can't take graduate law courses with the idea of qualifying to be a lawyer, even though law courses advance my profession. It's because the courses qualify me for a new profession.If it was taxable, your company should have put it on your W-2. Since they didn't, I wouldn't worry about it.