[Code of Federal Regulations] [Title 26, Volume 11] [Revised as of April 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 26CFR1.1016-6] [Page 73] TITLE 26--INTERNAL REVENUE CHAPTER I--INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED) PART 1_INCOME TAXES--Table of Contents Sec. 1.1016-6 Other applicable rules. (a) Adjustments must always be made to eliminate double deductions or their equivalent. Thus, in the case of the stock of a subsidiary company, the basis thereof must be properly adjusted for the amount of the subsidiary company's losses for the years in which consolidated returns were made. (b) In determining basis, and adjustments to basis, the principles of estoppel apply, as elsewhere under the Code, and prior internal revenue laws.