Stop Tax Haven Abuse Act

[AI summary unavailable — showing source text] Stop Tax Haven Abuse Act - Amends Internal Revenue Code provisions relating to tax shelter activities to: (1) establish legal presumptions against the validity of transactions involving offshore secrecy jurisdictions (i.e., foreign tax havens identified in this Act and by the Secretary of the Treasury); (2) impose restrictions on foreign jurisdictions, financial institutions, or international transactions that are of primary money laundering concern or that impede U.S. tax enforcement; (3) treat certain foreign corporations managed and controlled primarily in the United States as domestic corporations; (4) increase the period for Internal Revenue Service (IRS) review of tax returns involving offshore secrecy jurisdictions; (5) require tax withholding agents and financial institutions to report certain information about beneficial owners of foreign-owned financial accounts and accounts established in offshore secrecy jurisdictions; (6) disallow tax advisor opinions validating transactions in offshore secrecy jurisdictions; (7) subject dividend equivalents and substitute dividends to the 30% tax on foreign income; and (8) impose reporting requirements for transactions involving a pas…