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eInvoicing Documentation


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eInvoicing in Bulgaria


Ministry of Transport, Information Technology and Communications


Act amending the Public Procurement Act

Official publication: Държавен вестник ; Number: 86 ; Publication date: 2018-10-18 ; Page: 00001-00017

Art. 115a. (new – State Gazette (SG) 86/18)

Transposed the Directive 2014/55/EU


Use of the extra year for compliance of non-central entities (by )


Mandatory for

Receiving and processing: Central authorities, Regional authorities & Local authorities.


The European standard on eInvoicing is fully implemented. 

  • ISO 20022 (technical specification used voluntarily, mostly used for as a payment standard)

Electronic Public Procurement 

Use of CIUS and Extensions



The amended Public Procurement Act (PPA) by the Law for Amending and Supplementing the Public Procurement Act (LASPPA) legislates the use of eInvoicing and the European standard in Bulgaria since 18 October 2018. 

The Public Procurement Agency created a dedicated portal detailing guidance for compliance. 

According to the Art. 115a. (new – State Gazette (SG) 86/18 [1],[2]), in force from 1 November 2019, in the case of payment under public procurement contracts, all contracting authorities are obliged to accept and process eInvoicing, this to comply with with the Directive 2014/55/EU)[3] and implement the the European standard on electronic invoicing.

On 1 July 2020, provisions entered into force regarding electronic means of communication for tender evaluation, conclusion of a contract, ordering, invoicing and payment.

eInvoicing platform and eInvoicing management solutions

The LASPPA ensures the requirements of eInvoicing Directive transposition and the creation of the Central Automated Information System Electronic Public Procurement (CAIS EPP) as a national platform for electronic public procurement[4].

As of 2 May 2020, the Bulgarian PPA announced the renewal of the CAIS EPP, and the update to a 2nd version of the system was carried out. Several measures were implemented, with the aim of increasing the communication flow between public and private bodies. Amongst these measures, it stands out the anonymisation of candidates in project competitions [5].

The system encompasses three different types of users, (i) the default option ‘economic operator’, (ii) “contracting entity” or (iii) “individual”. CAIS EPP is under the responsibility of the Public Procurement Agency in charge of its set-up and maintenance. 

Approach for receiving and processing eInvoices

EInvoicing in Bulgaria is based on bilateral agreements between economic operators (or solution providers acting on their behalf) and public administrations. 

According to the practice of the Commission for Protection of Competition, resolutions for termination of a procedure with participants are served only through CAIS EPP. Article 9k, paragraph 1 of the Regulation for the Implementation of the Public Procurement Act states that the exchange of documents and communications between contracting authorities, candidates, participants and contractors is carried out through the platform [6].

CAIS EPP notifies the participants of new publications in the Buyer’s Profile about the procedures in which they participate.

eInvoicing implementation in sub-central level contracting authorities 

The legislation in place applies to all public levels; central, regional, and local contracting authorities and entities[7]

Status on the implementation of the European Standard on eInvoicing (EN)

The most frequently syntax used when exchanging eInvoicing is XML. The European standard is mandatory by law for all the contracting authorities. 

The National Revenue Agency (NRA) with industry stakeholders are discussing the idea of introducing mandatory eInvoicing for private entities. By the end of 2021 a decision will be reached [8]. ​

Monitoring eInvoicing implementation

It is specified that according to Article 9k, paragraph 3 of the Regulation for the Implementation of the Public Procurement Act, the users of the platform are obliged to monitor their profiles for notifications, messages and documents. CAIS EPP also notifies the participants of new publications in the Buyer’s Profile about the procedures in which they participate[9].

[1] State Gazette is only available in Bulgarian, [2] (Bulgarian State Gazette, 2019), [3] (Public Procurement Act, 2016), [4] (Republic of Bulgaria, 2021), [5] (Ilieva Voutcheva & Co., 2020), [6] (OECD, 2021), [7] (Storecove, 2021), [8] (Hysi, 2021), [9] (Ilieva Voutcheva & Co., 2020)

Are you aware of further developments on eInvoicing B2G in this country? Contact us via the link Something wrong with this page? at the bottom of this page.
You can also access the 2016201720182019 and 2020 eInvoicing Country Sheets via the eInvoicing User Community.


Last updated:  Jun 29, 2021 11:57