If you refinance a mortgage that was originally taken out after 10/13/1987, the refinanced mortgage will be considered "home acquisition debt" up to the amount of mortgage principal just before you refinanced. Any additional debt not used to buy, build or substantially improve a qualified home isn't home acquisition debt.
Per IRS Publication 936, home acquisition debt originated after 12/15/2017 is debt that is secured by your main home or second home and is limited to $750,000.
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