Is it per taxpayer or per loan?  I have a brother and sister that decided to buy a primary home together in 2022.  The loan on that house is for $1.5Million.  They are both on the title and loan.  Do we apply the $750K limit to the $1.5M, then take that remaining interest and split it between them? Or does each taxpayer get to apply the $750K limit to that $1.5M loan (in this case the interest is not limited, whatever interest was paid in 2022 gets split 50/50)?