Formation filing
Creates or registers the entity with the state.
Internal company rules
An operating agreement is not a registered agent, mailbox, EIN, or bank account.
The operating agreement is part of the company governance layer. It should not be used to blur address, mail, tax, or bank roles.
What it does
An operating agreement can set internal rules for the LLC: ownership, management, member rights, decision process, and company governance.
It can be very important. But it is not the same thing as the state formation filing, registered-agent appointment, mailing address, EIN, ITIN, or bank approval.
Operating agreement
Governs internal company arrangements, subject to state law and the agreement's terms.
Registered agent
Receives legal notices and service of process.
Mail authority
May require a mailbox provider, CMRA workflow, and PS Form 1583 depending on facts.
Tax identity
EIN and ITIN are tax ID roles, not proof that the company is operating at an address.
Bank review
The bank applies its own KYC and address rules.
Why it matters in the wild
Formation packages may include a template operating agreement. That can be useful, but it does not mean the provider is managing the business, receiving all mail, satisfying bank address rules, or solving tax identity requirements.
If a provider gives you a document, ask what role the document fills and what role it does not fill.
Official starting point
Delaware's LLC Act defines and discusses limited liability company agreements. Wyoming's LLC rules have their own operating-agreement provisions. A serious state page should cite the controlling state law before explaining a template document.