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When to register for a bank account for a C-Corp with no official money
Technically, it's only when you need to pass money through. However consider that the length the account has been open builds history with the financial institution, so I'd open ASAP. Longer history with the bank can help with getting approved for things like business credit lines, business cards, and other perks, though if you're not making money with that business, seek out a bank that does not charge money to have a business account open with them.