Where an original or refinanced primary or second home acquisition mortgage exceeds $750,000 ($1 million acquisition debt and $100,000 equity debt for loans incurred before December 16, 2017), the prepaid interest (points) must be proportionately allocated between the allowable limitations and the excess debt in the same manner as home mortgage interest is limited. For married separate filers (MFS), the limitations are 50% of the amounts noted here.