E-Invoicing in South Korea — Electronic Tax Invoices (전자세금계산서) Guide
South Korea's electronic tax invoice (jeonja segeum gyesanseo) explained — mandatory for all corporations since 2011 and for sole proprietors with prior-year supplies of KRW 80 million or more since 1 July 2024, transmission to the NTS by the day after issue, Hometax and ASP routes, certificates, penalties from 0.3% of supply value, and the proposed 2027 field renaming.