# IS-R-008

> If seller is icelandic and invoice contains supporting description EINDAGI then the id form must be YYYY-MM-DD — Ef seljandi er íslenskur þá skal eindagi (BT-122, DocumentDescription = EINDAGI) vera á forminu YYYY-MM-DD.

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/is-r-008

## Official rule text

If seller is icelandic and invoice contains supporting description EINDAGI then the id form must be YYYY-MM-DD — Ef seljandi er íslenskur þá skal eindagi (BT-122, DocumentDescription = EINDAGI) vera á forminu YYYY-MM-DD.