The whole interest, no ceiling — but never the principal verified
The entire interest paid in the year is deductible from taxable income, with no monetary cap. Nothing about the loan size, the institution's location, or the course fees limits the amount — only the actual interest paid limits it. The principal repayment carries no deduction under this section at all; conflating it with the principal-and-interest caps of other sections is the most common way this benefit gets under-claimed.