As global commerce increasingly flows through webs of related entities, nations must decide how to ensure that internal prices between affiliates reflect economic reality rather than tax convenience. Vietnam, with its growing role as a manufacturing and investment hub, has now redrawn those boundaries through Decree 255, effective July 2026, raising the threshold for smaller companies to breathe easier while extending the reach of tax authorities over larger multinationals. The reform is less a rupture than a maturation — Vietnam aligning its domestic rules with the international standards tha