I have a situation where I refinanced and took $3,600 extra in principal out. It is my understanding only the interest on this $3,600 is not deductible.
When I enter the data in turbotax, it's using mortgage origination date. There is no way to tell Turbotax all this debt is grandfathered into being deductible (minus the extra cash out).
On home interest worksheet it classifies it as post 2017 debt.
