No. The certificate creates the company on a state's list. How the activity is taxed is a later fact. A single member who never mailed a choice generally reports on a personal return. Several members, and silence on that choice, generally point to Form 1065. An S election is a form that has to be accepted, not a sentence said at formation.
If you left the filing appointment believing the tax question was finished, you are in a large crowd. The first useful step is to find the certificate and the last return and see whether they describe the same life.
Q2
Can the deposits stay in a personal account?
They can, and they will make the return harder. The account title is a third record. When it is your name, the deposits look like yours. When it is the company's name, they have a home that matches the certificate. A notice about an underreported deposit often starts in that gap.
Moving is ordinary. Open the account in the company's name, decide what the old deposits were, and close the months going forward against the right title. Old deposits are not given a name the statement does not already print.
Q3
What if someone quoted a large saving?
Ask where wages, the cost of running payroll, and the owner's basis went in that sentence. A company taxed as an S corporation generally pays the working owner wages. The saving that ignores those is not a plan. We do not print a dollar figure for a year we have not seen.
The return already filed outranks the quote. If the quote describes a life you are not in, the conversation is about a future year, or about whether an election was ever accepted.
Q4
Do I need a monthly arrangement in year one?
Maybe not. A handful of deposits and no one on payday can be a closed set of books and a return, and then a stop. We will say so. The month earns a regular place when money moves every week, or when a person is paid, because those are the facts that go stale if they wait for April.
Even a quiet year benefits from the right account title and from a return that matches the real classification. Those two are worth doing whether or not a retainer follows.