How foreign workers file Korea Form 8 for the 19% flat tax

Eight checks on Form 8

1. Eligibility before writing: Form 8 does not contain an eligibility checklist. Separately verify that the applicant is a foreign employee, is not a daily worker, lacks Korean nationality at tax-year end, began Korean work by the statutory date, remains within the 20-year window, and is not excluded through a related enterprise. A regional-headquarters exception can require expert confirmation.
2. Applicant identity: copy the legal name and alien registration number from current records. Enter nationality, current job title and an address that payroll can reconcile. Do not invent a missing identifier or shorten the name differently from payroll records.
3. Taxable period: write the year whose employment income is being settled. Do not use the form-completion year automatically when filing for a different income year.
4. Workplace: list each relevant employer for that taxable period. Match the employer name to the wage withholding receipt or payroll record, not merely a brand or worksite nickname.
5. Business number and business address: obtain the ten-digit business registration number and official location from the employer or withholding receipt. Do not confuse it with the applicant’s alien number or a corporate registration number.
6. Wage income: reconcile the amount for every workplace to the records used in the year-end or comprehensive return. The 19% method can treat normally tax-exempt amounts differently, subject to the narrow statutory welfare-benefit exception, so payroll must calculate the legal base.
7. Election effect: compare ordinary progressive settlement—with eligible deductions and credits—against the flat method, which generally applies 19% national income tax and disallows income-tax exemptions, deductions, reductions and credits. Local income tax may appear separately. Choose one result for the year; do not combine the favorable pieces of both.
8. Declaration, addressee and signature: attach Form 8 to Form 37 at year-end settlement and submit to the withholding agent or tax association, or file through the competent tax office with the comprehensive return. Enter the recipient, filing date and applicant signature. Form 8-2 is a different monthly-withholding application/withdrawal form.

Example only — do not submit: Minh T. first worked in Korea on 15 March 2022 and remains a foreign national at the end of the example tax year. Payroll separately verifies the 20-year window and related-enterprise rule. He enters the example year, his legal identity, two employers exactly as shown on their withholding records, each ten-digit business number, official address and reconciled wage income. After payroll compares the complete ordinary calculation with the statutory flat calculation, he elects only the confirmed method. The example then dates and signs Form 8, attaches it to Form 37, and keeps the filed copy. Replace every identity, date, employer, amount and eligibility fact; this example is not a recommendation to elect the flat tax.