1.   The estimation of the combined buffer requirement of the resolution entity at the resolution group consolidated level shall be the sum of the buffer requirements referred to in Article 129(1), paragraphs 4 and 5 of Article 131 and Article 133(4) of Directive 2013/36/EU, as applicable, as estimated in accordance with paragraphs 2 to 4 of this Article.

2.   Resolution authorities shall use as an estimation of the capital conservation buffer requirement referred to in Article 129(1) of Directive 2013/36/EU for the resolution entity at the resolution group consolidated level the capital conservation buffer requirement imposed on the Union parent institution at the group consolidated level.

3.   Where the resolution entity is also the Union parent undertaking, resolution authorities shall use as an estimation of the global systemically important institution (G-SII) buffer requirement referred to in Article 131(4) of Directive 2013/36/EU for the resolution entity at the resolution group consolidated level the G-SII buffer requirement imposed on the Union parent institution at the group consolidated level.

4.   Resolution authorities shall use as an estimation of the other systemically important institution (O-SII) buffer requirement referred to in Article 131(5) of Directive 2013/36/EU for the resolution entity at the resolution group consolidated level the O-SII buffer requirement imposed on the Union parent institution at the group consolidated level. Where the O-SII buffer requirement has also been set at another level of consolidation than at the group level, resolution authorities shall use as an estimation of that requirement the O-SII buffer requirement set at the level of consolidation that is the closest, in terms of total risk exposure amount, to the resolution group.

5.   Resolution authorities shall use as an estimation of the systemic risk buffer requirement referred to in Article 133(4) of Directive 2013/36/EU for the resolution entity at the consolidated resolution group level the systemic risk buffer requirement imposed on the Union parent institution at the group consolidated level. Where a systemic risk buffer has also been set at another level of consolidation than at the group level, resolution authorities shall use as an estimation of that requirement the systemic risk buffer requirement set at the level of consolidation that is closest, in terms of total risk exposure amount, to the resolution group.