Using the general transfer pricing rule, the maximum transfer price from the buyer division's point of view is calculated as follows: Lesser of: a) internal purchase price; or b) selling price of final product less other costs incurred to finish product Variable cost/unit on external transfer + Total lost contribution margin on external salesumber of units transferred internally Variable cost/unit on internal transfer + Total lost contribution margin on external salesumber of units transferred internally Lesser of: a) external purchase price; or b) selling price of final product less other costs incurred to finish product