Compliance · 🇨🇿 Czechia Live mandate

Czechia — ISDOC, Peppol BIS & B2G mandate

B2G mandate live · ISDOC + Peppol BIS · No B2B mandate yet — regulator: Ministerstvo financí (Ministry of Finance). Facts last refreshed: 2026-05-05.

Coverage model

Flowie operates a registered Peppol Access Point in this jurisdiction directly where we hold national accreditation, or via a vetted local partner registered with the in-country regulator where on-the-ground presence is required (KSeF, SDI intermediario, ZATCA service-provider, etc.). Either way, you call the same POST /v1/documents/send.

TL;DR

Czechia's national format is ISDOC 6.0, a UBL-derived XML schema in use since 2009.
Public-sector buyers must accept both ISDOC and Peppol BIS 3.0 since 2020.
No B2B mandate as of 2026; B2C remains free-format.
Flowie can render either ISDOC or Peppol BIS from the same JSON payload — auto-routed by the recipient's declared capability.

Deadlines

Date	Who	What
2009-04-01	ISDOC standard published	Voluntary B2B/B2G adoption.
2019-04-18	Central government	Must accept e-invoices (EU 2014/55/EU).
2020-04-18	Sub-central public authorities	Mandate extended.
≥ 2030	B2B (expected)	EU ViDA timeline; no national legislation yet.

Background

Czechia developed ISDOC (Information System Document) before EU EN 16931 existed; it remains the legacy domestic format, especially in public-sector procurement systems that pre-date Peppol. Since 2020, Czech public buyers must accept both ISDOC and Peppol BIS. Flowie selects automatically based on the recipient's SMP capabilities.

Format profile

ISDOC 6.0 (UBL-2 derived) for legacy B2G channels.
Peppol BIS 3.0 for cross-border and modern B2G.
Czech VAT: CZ + 8/9/10 digits.

Required fields

seller.vatNumberstringrequired

Format CZ12345678 (or 9/10 digits).
formatstringoptional

Set format: "isdoc" to force ISDOC rendering; default auto-selects.

Public sector (B2G)

Hub	Peppol identifier scheme	Lookup
Národní katalog e-fakturace (NEN)	`0151:CZ-NEN-<authority-id>`	https://nen.nipez.cz

The NEN platform is a marketplace for public procurement; its e-invoicing module is the most common B2G ingress for Czechia.

B2B reporting / clearance

No central B2B reporting hub — pure transmission only.

Error codes

Code	Meaning	Fix
`ISDOC-001`	Schema validation failure on ISDOC.	Check the schematron details — usually a missing `id` attribute or a mistyped enum.

Testing in sandbox

What you want to test	How
Czech B2G via ISDOC	Set `format: "isdoc"` in your `/v1/documents/send` body; sandbox renders and returns the ISDOC bytes.

FAQ

Should I send ISDOC or Peppol BIS?

Default to auto. Flowie checks the recipient's SMP record — if they advertise Peppol BIS, that's used; otherwise ISDOC. Setting format explicitly is only needed for legacy ERP integrations.

References

Primary sources (government / regulator / standards body):

EU Commission · eInvoicing in Czech Republic — Pan-EU reference factsheet.
NEN · Národní elektronický nástroj — Mandatory national e-procurement platform.
Ministry of Finance Czech Republic — Finance ministry — VAT and e-invoicing policy.
Ministry of Regional Development (MMR) — MMR operates NEN platform.

Industry analyses (vendor trackers — useful for cross-referencing):

Comarch · Czech Republic e-invoicing — Industry tracker — ISDOC, Peppol.