Revenue Participation Accounting. 1. The Employer shall calculate the Revenue Participation payments due under A. above for each twelve (12)-month period from September 1 to the following August 31 (“Accounting Year”) for which it has gross receipts as described in A.4. above. The calculation shall be reported on a statement provided to each Musician, the Federation, the Local and the Orchestra Committee. The payments and the statement shall be due by November 30 immediately following the Accounting Year.