On 25 February 2019, the Bulgarian National Revenue Agency published guidance on the potential VAT and customs implications of a no-deal Brexit for Bulgarian companies.
Within this guidance the National Revenue Agency provides various recommendations to companies doing business with the United Kingdom concerning;
• Registration with the customs authorities for trading with non-EU countries;
• Checking whether they have the required human resources, technical capacity and customs permissions for trading with non-EU countries;
• Considering an application for obtaining Authorised Economic Operator status – this status is an internationally recognised quality mark that allows businesses access to some simplified customs procedures;
• If registered under the Mini-one-stop-shop (MOSS) scheme in the United Kingdom, consider moving this registration to one of the other 27 EU member states
• Making any EU VAT refund directive claims relating to UK VAT well in advance before 29 March 2019 – The EU VAT Refund Directive is a mechanism in which EU companies can claim VAT incurred in other EU countries outside of a VAT registration.
For the full guidance please see here (in Bulgarian).