From January 1, 2026 credit institutions and branches of credit institutions operating in Bulgaria will become entities subject to the reserve requirement requirement in the Eurosystem. This is an important element of their full integration with the euro area, which is intended to ensure consistency of liquidity and statistical rules throughout the common currency area.
The ECB emphasizes that transitional provisions are neededbecause the regular reserve maintenance period runs from December 23, 2025 to February 10, 2026, which covers the moment when Bulgaria adopted the euro. Without additional rules, banks in Sofia, Plovdiv and Varna would be faced with a disproportionate administrative and operational burden resulting from a sudden change in the regulatory regime in the middle of the current trading period.
Transitional reserve holding period
Therefore, the ECB's decision provides for a special transitional reserve maintenance period from January 1 to February 10, 2026. At that time, separate rules for applying reserve requirements to Bulgarian institutions were introduced.
The document also specifies how to calculate the reserve base for liabilities to institutions located in Bulgaria, so as to reflect the change in the status of these entities from “outside the euro area” to “in the euro area” during the ongoing reserve maintenance period.
An important element facilitating smooth implementation is the possibility for institutions from other euro area countries to participate deducted liabilities to Bulgarian institutions from their reserve base.
This option applies to two reserve maintenance periods: from December 23, 2025 to February 10, 2026 and from February 11 to March 24, 2026. This solution is intended to limit the risk of unintended effects in statistics and interbank settlements upon the inclusion of Bulgarian banks in the Eurosystem framework.
The transitional provisions are consistent with the approach previously used for euro area enlargements. Their primary goal is the predictability and continuity of bank operations and liquidity stability throughout the Eurosystem when a new member state enters the single reserve mechanism.
The decision will be published in the Official Journal of the European Union. Banks operating in Bulgaria thus receive a clear schedule and rules that will allow them to synchronize their reporting and liquidity management processes with practices in force in the euro zone from the first day of membership.
