https://barun-tax.com/en/tags/korea-modified-tax-invoice-reasons/Recent content in Korea Modified Tax Invoice Reasons on Barun Tax & AccountingHugoen-USWed, 21 Oct 2026 00:00:00 +0000https://barun-tax.com/en/blog/2026-10-15-tax-invoice-deadline/Thu, 15 Oct 2026 17:50:00 +0900https://barun-tax.com/en/blog/2026-10-15-tax-invoice-deadline/<p>The tax invoice deadline is <strong>the 10th of the month after the month of supply</strong>. If you miss it, the supplier pays a penalty tax (가산세) of <strong>1%</strong> of the supply value (<strong>2%</strong> if the invoice is not issued by the final VAT return deadline), and the buyer also pays a late receipt penalty. If you issued an invoice by mistake, you do not cancel it. You fix it with a modified tax invoice.</p>