This paper studies the multinational firm's choice of transfer prices when the firm uses separate transfer prices for tax and managerial incentive purposes, and when there is penalty for non‐compliance with the arm's length principle. The optimal incentive transfer price is shown to be a weighted average of marginal cost and the optimal tax transfer price plus an adjustment by a fraction of the marginal penalty for non‐arm's length pricing. Insofar as the tax rates are different in different jurisdictions, the firm optimally trades off the benefits of tax arbitrage against the penalty for non‐arm's length pricing.