No, that line does not relate to an Income Phase-out.
The number on Line 18 of the TurboTax Student Info worksheet relates to the amount of income you reported to be "Excluded" from tax for education purposes.
The amount on Line 18 of the TurboTax worksheet is usually derived from an entry of a 1099-Q reporting a distribution from a 529 or other education savings account.
Please see this TurboTax Tip regarding Form 1099-Q
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