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EIN for personal LLC: Is this an S-Corp?
Having an EIN does not make the LLC a corporation -- your business can have an EIN even when treated like a sole proprietorship. An EIN is required to have a Individual 401(k), for example. But you can still be an LLC, taxed as a sole proprietor, and have a 401(k). You would need to file a Form 2553 with the IRS to elect S Corporation status. If you don't do that, you're still treated as a disregarded LLC. Whether or not you should make the election is another question.