Pillar 1 of the OECD/G20 agreement aims to reform international tax rules for large multinational enterprises. It proposes allocating a portion of profits from the largest and most profitable MNEs to market jurisdictions where users are located, regardless of physical presence. This would impact Vietnam's tax revenues from digital companies. The document discusses Vietnam's opportunities to collect additional corporate income tax under Pillar 1, and challenges such as ensuring its digital services tax would not conflict with the new global rules. It recommends Vietnam prepare for implementing Pillar 1, including improving rules on foreign contractor tax to facilitate direct tax declaration by foreign digital firms.