Student Loan Interest shows on Schedule 1, Line 21, and is transferred to Form 1040, Line 10.
You can check your Form 1040 in TurboTax Online by going to Tax Tools > Tools in the left-side menu, then 'View Tax Summary' from the pop-up menu.
Then back in the left-side margin, choose 'Preview My 1040'.
Here's more info on Student Loan Interest.
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