You do not enter payments towards your student loans on your tax return.
Only the interest you paid on the student loans (as the borrower or the co-signer) up to $2,500 are deductible. This interest is reported on form 1098-E.
Please read this IRS document for more information.
To enter your form 1098-E in TurboTax, follow these steps:
Open your tax return
Click on Federal in the left panel.
Click on Deductions & Credits at the top
Scroll down to the Education section. Click Show more
Select Start next to Student Loan Interest Paid (Form 1098-E)
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