Any Arizona limited liability company should have signed by all of its members a written agreement (“Company Agreement”) governing how members treat their LLC ownership shares and other important matters. Individual LLCs should also have a written company agreement. If you are a couple doing business together, setting up a limited liability company is a good way to organize your business. If you`re setting up a new business, it can be important to make sure you`ve got things right. You`ll also want to make sure you understand the impact of your chosen business structure on how your business is taxed. A single member corporate agreement is a written document for a limited liability company (LLC) with only one (1) owner.