"The federal government loses both individual and corporate income tax revenue from the shifting of profits and income into low-tax countries, often referred to as tax havens. The revenue losses from this tax avoidance and evasion are difficult to estimate, but some have suggested that the annual cost of offshore tax abuses may be around $100 billion per year. International tax avoidance can arise from large multinational corporations who shift profits into low-tax foreign subsidiaries or wealthy individual investors who set up secret bank accounts in tax haven countries. […]. Most provisions to address profit shifting by multinational firms would involve changing the tax law: repealing or limiting deferral, limiting the ability of the foreign tax credit to offset income, addressing check-the-box, or even formula apportionment. President Obama's proposals include a proposal to disallow overall deductions and foreign tax credits for deferred income and restrictions on the use of hybrid entities. Provisions to address individual evasion include increased information reporting, and provisions to increase enforcement, such as shifting the burden of proof to the taxpayer, increased penalties, and increased resources. Individual tax evasion is the main target of the proposed Stop Tax Haven Abuse Act and the Senate Finance Committee proposals; some revisions are also included in President Obama's plan."
CRS Report for Congress, R40623