Loan repayment and taxes

I'm interviewing for jobs currently with for profit private physician groups and some of them offer a bonus to use for loan repayment in a significant amount. Is there any way that anyone knows of or that has used to be able to apply the amount directly to loans without it being taxed at the high rate that exists for bonuses? As in is there some way to negotiate this into a contract?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums