Mortgage interest is only deductible on the part of the mortgage that was used to buy, build or substantially improve your home, so when you finished answering the questions in TurboTax and entered the amount that was used to buy, build or substantially improve your home, it was likely about 30% of your total balance.
"No matter when the indebtedness was incurred, you can no longer deduct the interest from a loan secured by your home to the extent the loan proceeds weren't used to buy, build, or substantially improve your home."https://www.irs.gov/publications/p936
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