When two already-existing businesses team up on a project — a developer and a contractor splitting a build, two consultancies co-selling a bundled service — the question isn’t just how to split the work. It’s whether the arrangement itself creates a partnership for tax purposes, whether either side wants that, and whether a new entity is worth forming at all.
The Default Federal Rule Doesn’t Require a New Entity
For federal tax purposes, an unincorporated joint venture or other contractual or co-ownership arrangement under which participants conduct a business or investment activity and split the profits is generally treated as a partnership — even if the arrangement isn’t recognized as a separate legal entity under state law. That means two businesses can trigger a Form 1065 partnership filing obligation through a handshake profit-sharing contract, without ever forming an LLC together.
Forming a New LLC for the Venture
Most parties instead form a purpose-built LLC to hold the joint venture, taxed by default as a partnership if it has two or more members. The advantage over a purely contractual JV is a clean liability boundary around just this project (protecting each party’s existing business from the other’s project-specific risk) and a formal operating agreement that can allocate income, gains, losses, and credits among the members in ways that don’t have to match ownership percentages — as long as those allocations have “substantial economic effect” under the partnership tax regulations, not just a number picked to minimize someone’s tax bill.
Why a Contractual JV Sometimes Makes More Sense
A purely contractual arrangement, with no new entity, avoids a second EIN, a second tax return, and a second registered agent — worth considering for a short, well-defined project where the added liability separation of a new LLC isn’t worth the administrative overhead. The tradeoff is that both parties’ existing entities carry direct liability for the venture’s obligations, since there’s no separate legal wrapper absorbing it.
This Is a Different Problem Than a Spousal Joint Venture Election
The Qualified Joint Venture election that lets spouses split a jointly-run unincorporated business on two Schedule Cs instead of a partnership return is a narrow, specific election unavailable to unrelated businesses partnering up — and unavailable to any LLC at all, spousal or not, outside a community property state. A JV between two separate, existing companies is governed by ordinary partnership tax rules, not the QJV election.
Get the Split in Writing Either Way
Whether the JV is a new LLC or a pure contract, the profit/loss split, capital contributions, decision-making authority, and exit terms need to be documented before the work starts — the same operating-agreement discipline that matters for any multi-member LLC applies here, just scoped to a single project instead of an ongoing business.
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Related reading: Multi-Member LLC Operating Agreements and Tax Elections and Single-Member LLC Tax Classification: The Disregarded Entity Default and the Spousal LLC Trap.
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