A dual consolidated loss is a loss that arises in a foreign corporation that is a member of a consolidated group for U.S. tax purposes and a foreign consolidated group for foreign tax purposes. A regular loss is a loss that arises in a foreign corporation that is not a member of a consolidated group for U.S. tax purposes. The difference lies in the treatment of the loss for U.S. tax purposes, as dual consolidated losses may be deducted against income from other members of the consolidated group, while regular losses cannot be deducted against income from other foreign corporations.