Try it

When is an invoice invalid?

When is an invoice invalid?

Invoices are a key part of business, providing a record of transactions and allowing both parties to keep track of their finances. However, not all invoices are valid and legal. In this article, we’ll explore the different situations where an invoice is considered invalid.

What does an invalid invoice mean?

An invalid invoice is essentially a document that fails to perform its primary function as a legally enforceable record of a transaction. When an invoice does not meet the legal requirements, various complications arise for both the issuer and the recipient of the invoice. Invalidity of an invoice may have several causes and consequences:

  • Incorrect Information: this can include errors such as incorrect company names, incorrect ID (organization identification number), incorrect addresses or contact information. These errors can lead to legal problems and make it difficult to collect debts.
  • Missing Information: the invoice must contain all necessary information such as date of issue, invoice number, description of goods or services, price details, VAT and more. If any of this information is missing, the invoice may be considered invalid.
  • Incorrect Formatting: while it may seem like a small detail, incorrect formatting of an invoice can lead to it being invalid. This includes incorrect arrangement of items, improper use of templates, or non-compliance with electronic invoice requirements.
  • Legal Requirements:Each country has its own specific requirements for what an invoice must contain. In the Czech Republic, for example, there are precise specifications regarding the content and form of invoices. Failure to comply with these legal requirements may result in the invoice being deemed invalid.
  • Implications for Business Relationships: Invalid invoices can seriously damage business relationships. If errors occur frequently, it can lead to mistrust between business partners and complications in business transactions.

It is therefore essential that companies are aware of the importance of correct invoicing to avoid legal problems and maintain good business relationships. In case of doubt or uncertainty, it is advisable to consult accounting standards or seek professional help.

Missing or Incorrect Information

One of the most common reasons why an invoice is considered invalid is missing or incorrect information. This includes incorrect supplier or customer information, incorrect invoice numbering, incorrect dating or missing business identification information.

Importance of Correct Numbering

Correct invoice numbering is essential for accounting and tax purposes. Each invoice must have a unique number. If the numbering is not consistent or is repeated, it can lead to legal problems or confusion when tracking transactions.

Formal Invoice Requirements

An invoice must meet certain formal requirements to be considered valid. This includes accurate and complete information about both parties to the transaction, a detailed description of the goods or services, and details of the price and VAT.

Importance of Detailed Description of Goods or Services

A detailed description of the goods or services is essential for the legal validity of the invoice. It must clearly state what was sold, in what quantity and at what price. Ambiguities in this description may cause the invoice to be considered invalid.

Corrections and Supplementary Invoices

If there is an error on an invoice, the situation can be rectified by issuing a correcting invoice or a supplementary invoice. These documents must be issued in accordance with legal requirements and correctly reference the original invoice.

How to Correct an Invoice Correctly?

The corrective invoice should reference the original invoice and clearly specify what corrections have been made. It is important to maintain transparency and ensure that all changes are properly documented.

Electronic Invoices and their Validity

Electronic invoices are increasingly used nowadays. These must meet the same legal requirements as printed invoices. It is important to ensure that electronic invoices are properly signed and encrypted to meet legal standards.

Security and Authenticity of Electronic Invoices

The security and authenticity of electronic invoices are key to their validity. This includes the use of digital signatures and encryption to ensure that information has not been altered and that the invoice comes from an authorized issuer.


Correct invoicing is essential for legal and accounting purposes. Understanding when an invoice is invalid helps prevent legal problems and ensures the smooth running of a business. It is important to pay attention to detail and ensure that all invoices are issued correctly and in accordance with applicable laws.

This website uses cookies to provide services at the highest level. By continuing to use the site, you consent to their use.