If my husband received extra non-taxed money marked as allowance for "school " , and he did not or does not go to school, is this taxable income? If so how to report?

This money he received was added in under adjustments on his pay stubs, and was definitely NOT considered a wage or listed on his W-2. My concern is that he did NOT go to school or have education expences so can he have a tax free "allowance " for school and not pay tax on this?