I had a client create an S Corp without asking any questions. They used the SAME name and EIN as their one-person LLC. If I file the S Corp return with the numbers, the client owes a lot of money to NY City The client does not even remember how they created the S Corp. Is the S Corp even valid if the EIN is the same as the LLC EIN? I would love to file the S Corp return showing no income or expenses and file the income and expenses only on the LLC on Schedule C. Any thoughts?