If your business is formed as an LLC, and both you and your
girlfriend are members, you would need to file Form 1065, U.S. Return
of Partnership Income. See LLCs Classified As Partnerships.
See this link from
the IRS. In general, every domestic
partnership must file Form 1065, unless it neither receives income nor incurs
any expenditures treated as deductions or credits for federal income tax
purposes.
You would need TurboTax Business
to file a Form 1065. It is available only as a CD or Download.
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