Invoicing Software for South Korea
A checklist for businesses in South Korea: the National Tax Service's rules on electronic tax invoices first, and Billed's features after, each quoted from its source.
In South Korea, the first question for any invoicing tool is how your electronic tax invoices get issued. The NTS's page on issuing methods (South Korea, checked October 31, 2026) explains issuing through "국세청에서 무료로 운영하는 홈택스" (our translation: Hometax, which the NTS runs free of charge), or "국세청에 등록된 전자(세금)계산서 발급업무 대행 사업자(ASP)가 일정수수료를 받고 운영하는 사이트 또는 자체 구축한 전자(세금)계산서 발급시스템(ERP)을 이용하여 발급" (our translation: through a site run for a fee by an e-tax invoice issuing agent (ASP) registered with the NTS, or through your own in-house e-tax invoice system (ERP)). So for each tool, find out which of these routes it uses before you rely on it for tax invoices. The South Korea invoicing guide on this site covers the NTS rules in more detail.
Worked example (sample figures, not suggested prices): a general taxpayer bills a business client 2,400,000원 for consulting. The NTS's VAT basics page (South Korea, checked October 31, 2026) says "일반과세자는 10%의 세율이 적용되는" (our translation: a 10% rate applies to general taxpayers), so the VAT is 2,400,000원 × 10% = 240,000원 and the total is 2,640,000원. Your tax accountant can confirm how VAT applies to your business.
For the client relationship around those invoices, Billed's features page says: "Create and save client profiles to bill them quickly."
Invoicing rules in South Korea
Local rules change over time; use these themes as a checklist and confirm details with a qualified adviser for your situation.
Who must issue electronically
The NTS's e-tax invoice obligation page (South Korea, checked October 31, 2026) lists "법인사업자 발급의무화" (our translation: electronic issuance made mandatory for corporate businesses) from 2011.1, and from 2024.7 "직전연도 과세분과 면세분 공급가액의 합계액 8천만원 이상 개인사업자 발급의무화" (our translation: required of sole proprietors once last year's taxable plus exempt supply value hit 80 million won).
Routes for issuing
The NTS's page on issuing methods (South Korea, checked October 31, 2026) explains issuing through "국세청에서 무료로 운영하는 홈택스" (our translation: Hometax, which the NTS runs free of charge), or "국세청에 등록된 전자(세금)계산서 발급업무 대행 사업자(ASP)가 일정수수료를 받고 운영하는 사이트 또는 자체 구축한 전자(세금)계산서 발급시스템(ERP)을 이용하여 발급" (our translation: through a site run for a fee by an e-tax invoice issuing agent (ASP) registered with the NTS, or through your own in-house e-tax invoice system (ERP)).
Sending the invoice on to the NTS
For invoices issued through an ASP or ERP system, the NTS's page on issuing methods (South Korea, checked October 31, 2026) gives the step "발급일 다음날까지 전송" (our translation: sent by the day after the issue date).
An emailed file isn't always an issued invoice
The NTS's page on issue timing (South Korea, checked October 31, 2026) says "전자서명하지 않은 (세금)계산서 파일을 거래상대방 이메일로 발송한 경우에는 아직 발급이 완료된 상태가 아님" (our translation: emailing a tax invoice file that has no electronic signature to the other party doesn't yet complete issuance).
Billed features
Convert An Estimate To Invoice
Billed's features page says: "Convert your estimate to invoice with a single click after getting approval from your client."
Frequently Asked Questions
Invoicing Software in Other Countries
Start Invoicing With Billed
Create invoices, track payments and keep your clients' details in one place with Billed.
At a glance
| What to check | Official source (South Korea) |
|---|---|
| Who must issue electronic tax invoices | NTS, checked October 31, 2026 |
| Hometax, ASP or in-house system | NTS, checked October 31, 2026 |
| Transmission deadline after issue | NTS, checked October 31, 2026 |
| Unsigned files sent by email | NTS, checked October 31, 2026 |
When this isn't for you
If the way you invoice clients in South Korea today already works for you, there's no need to switch.