A credit card is a loan facility so a payment of an expense is a loan. If this loan is refinanced with another loan, such as a LOC, then the deductibility of interest won't be affected.
The expense is still deductible.
if interest is incurred on the card then this may also be deductible but if there are personal expenses on the card the interest would need to be apportioned.
A credit card is a loan facility so a payment of an expense is a loan. If this loan is refinanced with another loan, such as a LOC, then the deductibility of interest won't be affected.