Bulgaria’s upcoming entry into the Eurozone remains one of the most debated political and economic issues in recent years. The the exact date for adopting the euro is still uncertain due to the need to meet the membership criteria. However, the necessary legislative changes have already been put in place. Businesses will need to adjust their operations to comply with new legal requirements. The following article outlines the key practical aspects of Bulgaria’s transition to the euro, that concerns the  legal status and  operation of  traders. It also examines the responsibilities of traders regarding the goods and services they offer after the introduction of the euro, as this is of essential importance to all market participants.