Turbo Tax says dependent student age 20 must file form 8615 when only income is "earned" taxable scholarship. This contradicts what Publication 970 says to do.

Dependent student ages 19-23 has taxable scholarship as box 5 is greater than box 2. Turbo Tax says Form 8615 is being filed on 1040a. Why when Publication 970 categorizes taxable scholarships as "earned income" that you type SCH (amount) next to line 1 of 1040EZ or line 7 of 1040A.