I share a cellphone plan with a family member, but only the data is shared. We have separate voice and messaging services with separate fees (say, $10 each line). The majority of voice and message services on my line is used for business purposes, and I'm wondering if I can deduct my portion of the cellphone bill (the $10 per line part) as a business expense on my tax return, even though the plan is billed together with my family member. Any insights or advice on this matter would be greatly appreciated.
