If you do business in Illinois or sell to Illinois consumers, you have to register, even if you are a sole proprietorship.--that's the law of your state.Paying people as independent contractors when they are not--while your officiants may be independent contractors, your administrative assistant almost certainly is not; AA's almost never meet the tests to be independent contractors--is a violation of both labor and tax law.You have significant potential liability. You should consult with an IL business attorney about setting up, registering, and running your business in a way that complies with the law.