you need to file a partnership return for the year business begins (usually when you open for business) and each year thereafter. form 1065. an LLC is not required. it's set up for the purpose of hopefully limiting the liability of its members. You would need Turbotax for Business to file the return. it's only available for Windows computers and currently costs $150. state would be extra.
form 1065 is due by the 15th day of the third month of the year. penalties for failure to file are steep. about $200 per month per partner or member with an annual maximum of about $2400 per partner/member.
