Yes, you still need TurboTax Business to prepare a partnership's income tax return. TurboTax business will prepare Form 1065.
And just to be clear, a partnership is not a sole proprietorship. Only an individual can have a sole proprietorship. Also, it's a partnership only if there is more than one partner (which seems to be the case because you mentioned "we" have a partnership). If what you have instead is a single-member LLC, it's a sole proprietorship and the LLC is a disregarded entity for the purpose of an income tax return. A sole proprietorship reports on Schedule C of Form 1040.
