Can you clarify what type of tax return you are filing and whether you have filed your federal return yet? In general, you must electronically file your federal return before your state return can be e-filed.
If your business is a sole proprietor or disregarded LLC, then you might be completing your business return as part of your individual tax return filing. In this situation, it is possible you need to mail in an attachment with Form 8453 after electronically filing your tax return. Please see this FAQ for more details on when you would need to mail in additional support with Form 8453 after electronically filing your return.
If you are preparing a C corporate return, TurboTax Business Online does not support C corporation returns. You must use TurboTax Business Desktop.
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