Korea four social insurances payroll: National Pension, Health Insurance (7.19% 2026) + Long-Term Care, Employment Insurance, Industrial Accident, with monthly EDI report preparation.
Korea payroll: earned-income withholding tax (간이세액) + local income tax on top of the four social insurances, computed per employee with a payroll register.
Korea year-end settlement (연말정산): deduction-data capture, settlement calculation and NTS withholding-statement prep on top of Korea payroll.
Korea NTS e-Tax invoice (전자세금계산서): NTS TaxInvoice XML, PKI signature prep, BRN checksum validation, clearance via customer ASP (BYOK)