If you do work within the city limits, where ever you are, there is probably a business license requirement.
Here is a quote from the City of Santa Rosa’s website:
“Any person whose business is located in the city or conducts business in the city must apply for a business tax certificate within 30-days of the date the business commences. Conducting business in Santa Rosa without a business tax certificate can result in penalties, violation notices, citations and court action. Whether you’re operating from home or a storefront, office or industrial park, you’ll need a Business Tax Certificate.”
As you can see, cities are anxious to register your business and collect a business tax! Is your city the same? Fortunately these taxes are usually very small but they do require some extra paperwork.
Go to your city’s website or call your city hall. If you’re required to have one, bite the bullet and get it for every city in which you will be doing business.