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@LSTAX wrote:

can he deduct all of the interest on the new loan interest on schedule A

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Yes.  Mortgages on rental property do not count towards the limit.

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@LSTAX wrote:

and all of the previous loans on schedule E?

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Only if all of the loan was used for the property.  If any of the loan (such as the HELOC) was used for personal items, that portion would not be deductible.