Quick Answer What is an A1 certificate?An A1 certificate is a legal document confirming which EU country’s social security system applies to a worker. It ensures that a person is insured in one Member State only, preventing double social security contributions when working across borders within the EU, EEA, or Switzerland. What Is an A1 […]
Introduction Operating a business in Bulgaria is rarely just about filing reports. It’s about understanding how accounting, tax, payroll, and administrative rules actually work in practice — especially when international elements are involved. At Aidos, we support Bulgarian and internationally active businesses, freelancers, and founders who need structure, clarity, and reliable long-term support. We work […]