8.9.b.1. Example: Corporation P owns all of the stock of Corporation S for the 12. month period ended December 31, 2011. Corporations P and S are unitary and are obligated to file a combined report for the entire period. Corporation P acquires 51% of the stock possessing voting power of Corporation A on March 7, 2011. The acquisition does not compel the filing of a short period return by Corporation A. All of the Corporations have a calendar year accounting period. Corporation A becomes unitary with Corporations P and S on July 1, 2011 and is obligated to file a combined report with Corporations P and S for the partial period beginning on July 1, 2011. The income and apportionment data of Corporation A for the period prior to July 1, 2011, cannot be included in a combined report with Corporations P and S. Under W. Va. Code §§ 11-24-1, et seq. and this rule, two separate partial period combined report calculations are required. One is for the P-S group for the partial period ended June 30, 2011, and the other is for the P-S-A group for the partial period from July 1, 2011, to December 31, 2011. If Corporation P's West Virginia combined report income is $ 250,000 for the partial period ended June 30, 2011 and P has a $ 60,000 West Virginia net operating loss for the partial period ended December 31, 2011, Corporation P's West Virginia combined reporting income for its income year ended December 31, 2011, is $ 190,000. If Corporation A has West Virginia income from its unaffiliated and non-unitary partial period (or from another combined reporting group, if applicable) of $ 50,000 and A has a West Virginia net operating loss of $ 30,000 for the combined report partial period after it joined the combined reporting group, Corporation A's West Virginia income for its income year that ended December 31, 2011, is $ 20,000.