Investment and Capital Stock Dataset (ICSD). In this chapter, I am going to address what sources of income are taxable in California, which extends beyond employment income.The new database contains comparable unbalanced panel data for 122 countries and the period of 1960 to 2016. In order to track how the capital stock per worker will evolve over time in both countries, you'll need to apply the formula for capital stock per worker. Treaty Trader (E-1) and Treaty Investor (E-2) visas are for citizens of countries with which the United States maintains treaties of commerce and navigation. This guide explains how to file the NR4 return and how to complete the T4A-NR Summary and slips.