Source: https://rivet.global/blog/korea-e-tax-invoice-requirements
Published: 2026-07-02 · Updated: 2026-07-02 · By Alexia M.

# Korea e-tax invoice requirements: who issues, when and how

Korea's electronic tax invoice rules: who must issue them, the KRW 80 million threshold for individual businesses, the 10th-of-month deadline and NTS transmission.

## Key takeaways

- All Korean corporations must issue electronic tax invoices for VAT-taxable supplies; individual businesses must once their prior-year supplies reach KRW 80 million.
- An e-tax invoice must be sent to the National Tax Service by the day after it is issued.
- Monthly consolidated invoices can be issued up to the 10th of the following month.
- Exports of goods and many services paid in foreign currency are zero rated, which affects how the invoice is issued.

"Korea e-invoicing requirements" and "korea e tax invoice" are the first suggestions after "Korea e-invoicing". Korea was one of the first countries to make electronic invoices mandatory, so for a Korean company the question is less whether than how and when.

## Who must issue

| Business | Rule |
|---|---|
| Corporations | Always, for VAT-taxable supplies |
| Individual businesses | From KRW 80 million of supplies in the prior year (since July 2024) |
| Smaller individual businesses | Paper or voluntary e-invoicing |

## Timing

1. Issue the invoice when the supply happens, or consolidate a month's supplies and issue by the 10th of the following month.
2. Send it to the NTS by the day after issue. Hometax does this automatically; certified software sends it for you.

## Exports and foreign customers

Exports of goods are zero rated. Many services supplied to foreign businesses and paid for in foreign currency through a foreign exchange bank are zero rated too. The documentation differs: some zero-rated sales need a tax invoice, others need export or foreign currency receipt evidence. A Korean SaaS company billing a US customer should keep the contract, the invoice and the record of the dollar receipt together.

## Keeping the ledger and invoices in step

When invoices go to the NTS within a day, the tax office sees your sales before your accountant closes the month. Mismatches between invoices and receipts are easier to explain when each payment is in the company's name with a clear reference.

## Paying into South Korea: the local rail

| What | Detail |
|---|---|
| Local rail | Interbank transfers through KFTC's electronic banking network |
| Run by | Korea Financial Telecommunications and Clearings Institute |
| Settlement | Seconds, 24/7 |

Source: [KFTC](https://www.kftc.or.kr/eng). Checked when this guide was last updated; the scheme's own page has the current figures.

## Where Rivet fits

Rivet gives registered companies USD details on the free Starter plan and EUR and GBP details on Growth, so overseas customers pay in their own currency and each receipt shows the payer and reference. Statements export for your accountant. Check the eligibility list on our site for Korean companies. Rivet is not a bank; regulated partner institutions hold the funds. See [Korea companies receiving foreign payments](/blog/korea-companies-receiving-foreign-payments-fx-rules).

## Questions

### Does Korea have mandatory e-invoicing?

Yes. Korea has required electronic tax invoices from corporations since 2011 and has lowered the threshold for individual businesses in steps, to KRW 80 million of prior-year supplies from July 2024.

### How do I issue a Korean e-tax invoice?

Through the NTS Hometax portal or certified invoicing software, using a digital certificate for the business.

### What happens if I issue late?

Late issuance and late transmission carry penalties based on the supply value. Check the current rates on the NTS site.

### Do I need an e-tax invoice for overseas customers?

Zero-rated exports follow different rules depending on what is supplied and how payment is received. Ask your tax adviser how your export sales should be documented.