Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is interest on a personal loan tax deductible?
When you pay interest on a loan used to fund a legitimate investment or business activity, that interest becomes an expense that you can deduct against related income. For example, if you borrowed $10k to buy stocks, you could deduct the interest on that $10k loan from investment gains.  In your case, you are borrowing money to invest in the stock of your company.  You would be able to deduct the interest expense against investment gain (like selling stock or receiving dividends), but not from any income from the business. (See this link for more information.) You do not have to pay taxes on the interest paid to your father; that is an expense, not income.  However, your father has to pay taxes on that interest, because that is income for him.