Is the coop loan secured by your residence (primary or second home)? In most cases, the outstanding principal on all mortgages for which you report mortgage interest would be included in the calculation of the allowable interest deduction. So, yes, if the loan is secured, add the amount to your personal mortgage amount.
However, if the coop interest is not paid on a secured loan for a residence, that interest would not be deductible on Schedule A.
If the coop is a rental property, you can report the interest on Schedule E instead.
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