Some common reasons include: 1  a serious accident â such as a road accident, a severe head injury, a serious fall or severe burns. 2  a serious short-term condition â such as a heart attack or a stroke. 3  a serious infection â such as sepsis (blood poisoning) or severe pneumonia.
The definition of unnecessary is not needed. An example of something unnecessary is a bowl of sugar for cooking meatballs.
â¢ You are an employee deducting ordinary and necessary expenses attributable to your job. An ordinary expense is one that is. common and accepted in your field of trade, business, or profession. A necessary expense is one that is helpful and appropriate for. your business.