I recently paid $806 by credit card to replace a fridge in an IP. The credit card debt is due soon so I'll pay the $806 debt using funds drawn from a Viridian LOC. Can I claim the interest on the LOC? The LOC is only used for investment purposes, nothing personal. The only other debt on the credit card is $500 for personal use but don't think it's relevant if I pay exactly $806 before the due date.