It may be that your Student Loan Interest Deduction is being limited due to your adjusted gross income. If you are not married and your modified adjusted gross income is between $70,000 and $85,000 you are still getting a deduction, but the amount is gradually reduced and no longer dollar for dollar. Same if you are married filing jointly with incomes between $140,000 and $170,000. Married filing separate individuals are not eligible for the student loan interest deduction. The IRS Publication 970 details the calculation and what constitutes your modified adjusted gross income. You also cannot deduct more than $2,500 of student loan interest, but it does not sound like that is the issue you are encountering.
