If your consultancy is based from a location in the City, a Business Tax Certificate will be required for that location. State law requires that all business personal property be assessed annually for property tax purposes.Find information about rules and permits on the state's CalGold website. Businesses in County unincorporated areas may need to file a fictitious business name. Your step-by-guide for starting a business in San Diego. Learn about everything you need to get going and how we can help you start your business today! Who must obtain a seller's permit? What does engaged in business mean? Get information on incorporation in San Diego, California. Learn how to structure your business, choose a name, what documents are needed and more.