One of the major motivations for the 2017 tax revision (P.L. 115-97) was concern about the international tax system. Issues associated with these rules involved the allocation of investment between the United States and other countries, the loss of revenue due to the artificial shifting of profit out of the United States by multinational firms (both U.S. and foreign), the penalties for repatriating income earned by foreign subsidiaries that led to the accumulation of deferred earnings abroad, and inversions (U.S. firms shifting their headquarters to other countries for tax reasons). In addition to lowering the corporate tax rate from 35% to 21% and providing some other benefits for domestic investment (such as temporary expensing of equipment), the 2017 tax bill also substantially changed the international tax regime. The tax change moved the system from a nominal worldwide tax on all foreign-source income, with a credit against U.S. tax for foreign taxes due, to a nominal territorial system that does not tax foreign-source income. Nevertheless, both systems could be considered a hybrid of a worldwide and territorial system. Prior law reduced the tax on foreign-source income by allowing deferral (taxing income of foreign subsidiaries only if it was repatriated, or paid as a dividend to the U.S. parent) and cross-crediting of foreign taxes (so the credit for high taxes paid in one country could offset U.S. tax on income from a low-tax country). The new system exempts dividends, but also imposes a current worldwide tax on global intangible low-taxed income (GILTI), but at a lower rate. It also introduces a corresponding lower rate on intangible income derived from abroad from assets in the United States (foreign-derived intangible income, or FDII). The new law adds the base erosion and anti-abuse tax (BEAT) to existing anti-abuse measures aimed at artificial profit shifting. BEAT imposes a minimum tax on ordinary income plus certain payments to related foreign companies. Despite the lower corporate tax rate, it is not clear that capital will be shifted into the United States from abroad; although a lower rate reduces the tax rate on equity-financed investments, it decreases the subsidy to debt-financed investments. Whether the capital stock increases or decreases depends on the magnitude of the tax changes (which appear largely offsetting) and the international mobility of debt versus equity. It is also not clear whether the capital stock will be allocated more efficiently or in a way more optimal for U.S. welfare, although economic theory suggests that reducing the tax subsidy for debt is a clear improvement. Although a territorial tax may make profit shifting more attractive, overall, given other elements of the new system, it appears to make profit shifting less important. GILTI and FDII bring the tax treatment of income from intangibles in the United States and abroad closer together, and BEAT and stricter thin capitalization rules (rules limiting interest deductions) also limit profit shifting, including shifting through leveraging. The new system ends the penalties (except for portfolio investment in foreign firms) for repatriating earnings and thus eliminates the prior incentives to retain earnings abroad. A series of measures aimed at inversions appears to make inversions much less attractive. Some of the measures may violate international agreements such as the World Trade Organization (WTO), bilateral tax treaties, and Organization for Economic Cooperation and Development (OECD) minimum standards to prevent harmful tax practices. There have been a number of concerns about design features in the new regime, including the dividend deduction, GILTI, FDII, BEAT, and other features. A variety of options might be considered to address these issues.