The following was copied and pasted directly from the link provided in the above post.
Even with the mortgage interest deduction substantially reduced and the elimination of home equity indebtedness under the TCJA, there may still be a way to obtain a deduction for the interest on the mortgage or home equity loan. If you were to take out a mortgage or a HELOC secured by your residence and used the proceeds for another purpose such as to fund trade or business operations or to purchase an investment asset, the interest could become deductible, subject to any limitations of that interest category.
