(e) Average annual net earnings of a business or farm operation. The average annual net earnings of a business or farm operation are one-half of its net earnings before Federal, State, and local income taxes during the 2 taxable years immediately prior to the taxable year in which it was displaced. If the business or farm was not in operation for the full 2 taxable years prior to displacement, net earnings shall be based on the actual period of operation at the displacement site during the 2 taxable years prior to displacement, projected to an annual rate. Average annual net earnings may be based upon a different period of time when the Agency determines it to be more equitable. Net earnings include any compensation obtained from the business or farm operation by its owner, the owner's spouse, and dependents. The displaced person shall furnish the Agency proof of net earnings through income tax returns, certified financial statements, or other reasonable evidence, which the Agency determines is satisfactory. (See appendix A, § 24.305(e).)