TPguidelines

In the absence of a written agreement, the district director may impute a contractual agreement between the controlled taxpayers consistent with the economic substance of the transaction. In determining the economic substance of the transaction, greatest weight will be given to the actual conduct of the parties and their respective legal rights (see, for example, § 1.482-4(f)(3) (Ownership of intangible property)). For example, if, without a written agreement, a controlled taxpayer operates at full capacity and regularly sells all of its output to another member of its controlled group, the district director may impute a purchasing contract from the course of conduct of the controlled taxpayers, and determine that the producer bears little risk that the buyer will fail to purchase its full output. Further, if an established industry convention or usage of trade assigns a risk or resolves an issue, that convention or usage will be followed if the conduct of the taxpayers is consistent with it. See UCC 1-205. For example, unless otherwise agreed, payment generally is due at the time and place at which the buyer is to receive goods. See UCC 2-310.