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Thank you for you answer.  @GSD77 

Clarification: the loan refinanced in 2020 was $930k

I think this is correct:

the Loan Refinanced ($930k) in 2020 with a larger one ($1.1M including cash-out for improvements)

$930k loan originated Nov 2017, so $1M limit applies to its balance of 930k which is grandfathered over as the portion of the new loan, ($1.1M) that is deductible?

 (930,000/1,100,000) x  total interest =  deductible interest

 

I'm going to forget about the $20k already spent in 24 months prior as the entire additional cash-out is intended for improvements anyway.  

 

Does this sound correct?

Must I still calculate the Avg monthly principal balance per Pub 936 as well or will TT do it?

Thank you in advance