A Foreign Worker's Flat-Rate Election in Korea Trades the Deductions for One Rate
The Scene A Korean employment contract arrives with one line near the bottom that the rest of the document does not explain: income tax will be withheld at a flat 19 percent. Whether that line is available at all depends on a date that may lie years in the past, and on who owns the company doing the hiring. The flat rate is not a visa privilege and not an employer policy. It is Article 18-2 of the Restriction of Special Taxation Act with Article 16-2 of its Enforcement Decree, in the version promulgated as Act No. 21223 on 23 December 2025 and in force from 1 January 2026. Both are single long sentences whose closing clauses reverse what their openings appear to promise. Four tests, and one proviso that puts a failed test back All four must hold for the taxable period in question. Failing any one leaves the ordinary route. 1. First day of work in Korea on or before 31 December 2026 Otherwise: ordinary progressive route under Income Tax Act Article 55(1)...