---
title: "Czechia — ISDOC, Peppol BIS & B2G mandate"
description: "Czechia e-invoicing: B2G via ISDOC and Peppol BIS, no B2B mandate yet. NÚKIB / Ministry of Finance e-invoicing portal."
canonical: "https://docs.get-flowie.com/compliance/cz"
source: "https://docs.get-flowie.com/compliance/cz.html"
---

# Czechia — ISDOC, Peppol BIS & B2G mandate

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)](<https://www.mfcr.cz>). _Facts last refreshed: 2026-07-13._

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](<https://ec.europa.eu/digital-building-blocks/sites/spaces/DIGITAL/pages/467108881/eInvoicing+in+Czech+Republic>) — Pan-EU reference factsheet.
  * [NEN · Národní elektronický nástroj](<https://nen.nipez.cz/en/>) — Mandatory national e-procurement platform.
  * [Ministry of Finance Czech Republic](<https://www.mfcr.cz/en/>) — Finance ministry — VAT and e-invoicing policy.
  * [Ministry of Regional Development (MMR)](<https://mmr.gov.cz/en/>) — MMR operates NEN platform.



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

  * [Comarch · Czech Republic e-invoicing](<https://www.comarch.com/trade-and-services/data-management/e-invoicing/e-invoicing-in-czech-republic/>) — Industry tracker — ISDOC, Peppol.