Bulgaria's National Revenue Agency (NRA) has begun rolling out an AI system developed by INSAIT, the Institute for Computer Science, Artificial Intelligence and Technology at Sofia University, across all of its organisational structures, making it the first large-scale public administrative body in the country to deploy the BgGPT national language model.

Following a successful pilot phase, the system is now in expanded use across the NRA's central office and seven territorial directorates.

The AI system enables staff to conduct general and specialised searches related to tax and social security legislation, generating instant responses to improve service quality for citizens and businesses.

Crucially, it runs exclusively on open-weight models and operates on proprietary hardware, an approach specifically designed to prevent data leakage and protect privacy, two of the central concerns when integrating AI into government institutions.

The next phase of the project will see the system adapted for specialised use cases and integrated into internal processes alongside national integrator 'Information Services', with the goal of reaching daily use by more than 7,000 NRA employees.

INSAIT describes the initiative as a concrete contribution to European AI sovereignty, with Bulgaria combining nationally developed language models and locally controlled hardware to reduce dependence on commercial AI providers.