The determination of the date the partnership begins business is a question of fact, but ordinarily it begins when the partnership starts the business operations for which it was organized. For example, the acquisition of operating assets that are necessary to the type of business contemplated may constitute beginning business. The mere signing of a partnership agreement is not sufficient to show the beginning of business.3
1. IRC § 709(b).
2. Treas. Reg. § 1.709-2(a).