Tax question about Interest on a Hard Money loan for a flip

[Ray Slack]

What a basic question. I'm doing 2015 taxes before the deadline.

Purchased a flip in 2015 and got a hard money loan and sold it in 2016. 

Since it wasn't sold until 2016 it's not reported on 2015 tax filings. My question is would the interest paid to the HML in 2015 be deducted in 2015? or would it be deducted in 2016 when the house was sold?

Thanks

Ray

H