This paper presents the specification of an investment-income model for 23 OECD countries and six non-OECD regions. The basic structure of the model -- an effective rate of return applied to the stock of foreign assets and liabilities -- is relatively simple and straightforward. A central distinction is made between dollar and non-dollar denominated foreign assets and liabilities and matrices giving estimates of the currency composition of these stocks are reported. Estimation and simulation results for the investment-income model are presented ...