Czechia operates one of the EU's stricter VAT compliance regimes. Since 2013, the Czech Tax Administration has publicly blacklisted companies as "nespolehlivý plátce DPH" (unreliable VAT payer). The register currently holds over 4,700 entities, and the consequences for their trading partners can be severe. If you source goods or services from Czech businesses, understanding this mechanism is not optional — it is a basic financial safeguard.

The Legal Background

The concept is anchored in the Czech VAT Act (Act No. 235/2004 Coll.), specifically:

  • § 106a — defines when the Tax Administration assigns the "unreliable payer" status to a VAT-registered entity that has seriously violated its VAT obligations (missed returns, unpaid tax debt, involvement in carousel fraud).
  • § 106ab — extends the concept to an "unreliable person" (physical or legal entity not yet VAT-registered but with a history of non-compliance), introduced in 2017.
  • § 109 — the critical liability clause: the recipient of a taxable supply becomes jointly and severally liable for VAT the supplier fails to remit, under specific trigger conditions.

The status is valid for a minimum of 6 months and is published immediately in the public register maintained by the Czech Ministry of Finance at adisreg.mfcr.cz.

When Does Liability Attach to You?

Section 109 of the VAT Act triggers joint liability when at least one of the following is true at the time of supply or payment:

  • The supplier is listed in the unreliable payer register at the date of the taxable supply.
  • You pay the invoice to a bank account that is not published in the official register of declared VAT payer accounts (accessible via the Czech Tax Portal "Moje daně").

In practice, this means paying a correct invoice in full is not enough. If the supplier's account is undisclosed or if the supplier is blacklisted, the Czech Tax Administration can pursue you for the unremitted VAT — even though you are the buyer.

How to Check a Supplier

The official tool is the Ministry of Finance register at adisreg.mfcr.cz. You enter a VAT number (DIČ) or company registration number (IČO) and instantly receive the reliability status and the list of the supplier's declared bank accounts.

For a single supplier, this is straightforward. However, for procurement or accounting teams managing dozens or hundreds of vendors, manual portal checks quickly become impractical — and gaps in coverage create legal exposure.

Scaling Checks Across Your Supplier Base

For organisations that work with many Czech counterparties, the practical solution is automated batch verification. Instead of checking each IČO individually, a data service or API integration can flag the full supplier list in one pass. The same principle powers the export of companies by industry.

Databázekontaktu.cz covers more than 4.4 million Czech companies with data sourced directly from ARES and public registers, including live VAT payer status and reliability flags. Finance teams and accounting firms can map their supplier lists against current Financial Administration data before every payment run — eliminating manual effort and the risk of missing a newly blacklisted vendor. Coverage and pricing: company database subscription.

A Practical Protection Checklist

  1. Before the first order: verify the supplier's DIČ/IČO against the unreliable payer register.
  2. Before every payment: confirm the invoice bank account matches an account declared by the supplier in the official register.
  3. Monthly sweep: re-verify your entire active supplier list — status can change at any time.
  4. Uncertain cases: consider using the "special tax security" mechanism (paying to the tax authority's deposit account), which extinguishes joint liability by law.

Conclusion

The Czech unreliable VAT payer regime places a real due-diligence burden on buyers, not just suppliers. Ignorance is not a legal defence. For companies procuring in Czechia — whether domestic or cross-border — a systematic, automated verification process is the only reliable way to protect against unexpected VAT liabilities. The cost of a data subscription is a fraction of a single contested tax assessment. Other public sources for partner screening are covered in ARES, Insolvency & Contract Register: Czech Public Data Explained.