Invoicing Software for South Korea

South Korean VAT (부가가치세) is charged at 10% on most domestic supplies. Corporations and many individual businesses must issue and transmit electronic tax invoices (전자세금계산서) through the National Tax Service (NTS) HomETax / e-Tax system (often called e-Sero in vendor language). Each document needs both parties' ten-digit business registration numbers (사업자등록번호), supply value, tax amount, and timing that matches your VAT return. Late issuance or late transmission can trigger penalties—commonly cited guidance points to up to 1% of supply value for late transmission and up to 2% where issuance itself is deficient—so calendar the tenth-day-of-following-month deadline for many monthly filers.

Domestic B2B buyers expect document numbers that align with their ERP and 마감 (month-end close) cutoffs; sending bills one or two business days before close reduces rework. Bank transfer (계좌이체) remains standard—list 은행명, 계좌번호, and 예금주 exactly as registered. Cards and apps such as Kakao Pay or Naver Pay appear more in B2C or smaller trades; reference those channels in notes when relevant.

English-language PDFs help foreign clients, but Korean buyers often still want Korean descriptions, amounts in KRW without unnecessary rounding drift, and a company seal image (직인) for internal approval. Keep issued, modified, and cancelled e-tax records for five years and reconcile supply values to your semi-annual VAT return. Practical tip: batch-issue recurring SaaS or retainer bills early in the month so your team can fix rejections before the transmission window tightens.

Foreign subsidiaries and Korean branches sometimes need English descriptions for group reporting while keeping Korean statutory wording—maintain both in memo or attachment naming conventions. Stock and service bundles should list unit prices transparently; Korean buyers reconcile each line to purchase orders and customs entries where goods are involved.