The Business ID Number is required for any business to exist. The Business ID Number is the first 9 digits of the telephone number. It is required for banking as the business needs to keep personal income separate. The business is allowed to pay the owner an appropriate amount of money, but as with the business, the capital gains from the business will be taxed whereas an employee does not pay taxes on income.
The business ID number is required for a bank account, and a telephone number. It will also be used when conducting business with other businesses. If anyone wants to do a contractional business with you, then they will need to acquire a GAON. This will even include a landlord with just a few rental properties. Yes, that would be considered as a business, and will require a Business ID Number.
As with a person’s NIN, a Business ID Number is public information. Businesses will either be a proprietorship, or an LLC. An LLC will require that there is a board to handle the day to day runnings of the business. A single person can wear many hats for the LLC, so a president of the company can also can a treasurer. To keep things private, the owner can disclose to not included their name as public information when they file for an LLC. Obviously, a proprietorship is known with common sense.