quesion1: for itemized deduction, is all sales tax deductible or is it only specific expenses?

question2: create a topic/question that related to Standard deduction.

Q3: Let's say someone is self-employed & works from a home office. How would you deduct expenses such as the home office itself or utilities used for the business? Also how would you go about deducting shared equipment that is used by the whole family? For example a printer or computer could be used for business but also used for personal use within the household.

q4: How do foreign corporations become qualified in providing investors with qualified dividends?