NEN — Czech Republic e-invoicing

Invoicerr does not support the Czech Republic

No Czech Republic data file exists anywhere in this repository — no country policy, no identifiers, no tax system, no transmission channel. Nothing on this page is implemented. It is here so that someone who wants Czech Republic support knows what adding it would involve. The countries Invoicerr does cover are listed in the country directory.

The Czech Republic runs mandatory B2G e-invoicing through NEN (Národní Elektronický Nástroj), the national public-procurement platform operated by the Financial Administration (Finanční správa). Invoices submitted through NEN typically use ISDOC, the Czech national XML format. B2B e-invoicing is voluntary, with no domestic clearance requirement.

What supporting the Czech Republic would involve

System	NEN — Národní Elektronický Nástroj, the Czech public-procurement e-invoicing platform
Authority	Financial Administration (Finanční správa)
Format	A national XML schema (ISDOC). No provider in backend/src/modules/documents/formats/ builds it today.
Transmission	NEN (Národní Elektronický Nástroj). No transport in backend/src/modules/documents/transports/ talks to it today.

Inherited, unverified

Carried over from an earlier research pass in this repository's own history, and never checked against a primary source. Leads, not facts — confirm every line before writing it into a data file.

• B2G e-invoicing has been mandatory since October 2016 for central bodies, and for all public entities since April 2019.
• ERS, the former real-time sales-reporting requirement, was abolished in January 2023.
• B2B e-invoicing is voluntary and post-audit, with no domestic clearance step.

Which catalogues a contributor would add

Adding a country is data, not code. Adding a country is the procedure and the contract each file has to satisfy; this is only the shopping list for the Czech Republic.

• country-policy/data/cz.json — which document actions the Czech Republic allows. Start here: without this file every action is refused with a 403, naming the country.
• country-identifiers/data/cz.json — which national identifier a party must carry.
• tax/tax-systems/data/cz.json and vat-rates/data/cz.json — the tax kind, and the rate ladder offered on an invoice line.
• correction-routes/data/cz.json — all eleven canonical correction routes, unverified where unresearched, never omitted.
• b2g-routing/data/cz.json — the channel and format a Czech public buyer requires.
• transports/channel-policy/data/cz.json — whether a channel is legally required of a seller established in the Czech Republic, and from what date.
• archive/retention/data/cz.json — how long an archived document is kept, and what the duration is counted from.

Add mentions/, content-requirements/, country-fields/, reporting/ and domestic-reverse-charge/ only where the law actually gives them content.

Data alone will not finish the job here: NEN is a transmission channel this repository does not implement, and the ISDOC schema has no format provider. Both are code, not a JSON file — see When a country needs more than a file.

Want the Czech Republic supported?

Check the open compliance issues first. If there is no issue for the Czech Republic, open one and name which of the files above you need — a request that names one mechanism is far more actionable than "please add the Czech Republic".