Tax Implications of a Cash out Refinance

Hello, I am trying to determine whether the interest on a cash out refinance for an investment property is tax deductible. I know on your home if you do a cash out refinance that you have to spend the new delta of loan proceeds on your home for the new interest, above the original loan amount of interest, to be tax deductible. Been asking around and not getting a straight answer so any help here would be much appreciated!