The EU does not set a single VAT rate; instead, the EU VAT Directive (2006/112/EC, as amended) requires every member state's standard VAT rate to be at least 15%, with no fixed ceiling (Hungary's 27% is currently the EU's highest, Luxembourg's 17% the lowest). Reduced rates of at least 5% are permitted for a defined list of goods and services. Beyond VAT, EU membership brings the Parent-Subsidiary Directive and Interest and Royalties Directive (eliminating withholding tax on qualifying intra-group payments), the Anti-Tax Avoidance Directive (ATAD, covering CFC rules, interest limitation, and exit taxation), and mandatory participation in DAC (Directive on Administrative Cooperation) automatic information exchange - the EU's implementation of the OECD Common Reporting Standard. All 27 EU member states appear as individual entries in the main country directory with their own headline rates.
CARICOM's 15 full members (including Antigua and Barbuda, The Bahamas, Barbados, Belize, Dominica, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Suriname, and Trinidad and Tobago) operate the CARICOM Single Market and Economy (CSME) framework, which covers a Common External Tariff on goods from outside the bloc and free movement provisions for goods, services, capital, and certain categories of labor between members - but CARICOM does not harmonize member states' domestic VAT/GST or income tax rates, which remain fully independent (see each country's own directory page for its actual rates). The often-referenced "Caribbean dollar" is not a shared CARICOM currency; most Eastern Caribbean CARICOM members instead share the separate Eastern Caribbean dollar (XCD) through the Eastern Caribbean Currency Union, a narrower monetary arrangement than CARICOM itself.
The CIS is a looser economic and political association of several former Soviet republics, historically including Russia, Belarus, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, Armenia, Azerbaijan, and Moldova, with Turkmenistan as an associate member; Ukraine and Georgia have withdrawn or ceased active participation at different points, and CIS membership has continued to shift in the 2020s. The CIS free trade area reduces tariffs between participating members but, like CARICOM, does not harmonize domestic tax rates - each member's corporate, personal, and VAT rates remain independently set (see each country's directory page). Several CIS members separately participate in the more integrated Eurasian Economic Union (EAEU - Russia, Belarus, Kazakhstan, Kyrgyzstan, Armenia), which does include a genuine customs union with a common external tariff. Given how frequently CIS membership status changes, confirm current participation directly via a primary source before relying on it for planning.
USMCA, which replaced NAFTA in July 2020, is a free trade agreement between the United States, Mexico, and Canada. Like the other blocs above, it governs tariffs, rules of origin, and market access - not domestic income tax or VAT/GST rates, which each of the three countries sets entirely independently (see the United States, Mexico, and Canada in the main directory for their respective rates).
This page is a high-level orientation to the largest blocs, not a comprehensive registry of every regional trade agreement, customs union, or economic community in the world (ASEAN, Mercosur, the African Continental Free Trade Area, the GCC, and dozens of bilateral and plurilateral FTAs are not detailed here). Adding full treatment of every regional bloc, plus full bilateral tax-treaty and totalization-agreement mapping for all 208 jurisdictions in the main directory, is a substantially larger undertaking than what's built so far - flagged honestly rather than represented as complete.