The transition begins on 1 November 2026 and the supply chain implementation period ends on 1 June 2028.

Chemical formulators have until 1 November 2027 to complete formulation recertification, while suppliers have until 1 June 2028 to complete their chemical inventory transition.

Performance InCheck will list ZDHC MRSL V3.1 and V4.0 conformance side by side from 1 February 2027 which enables brands to monitor the suppliers’ transition.