Section 42(1)(h) in The Central Goods and Services Tax Rules, 2017
(h)input tax credit left after attribution of input tax credit under clause [(h)] [Substituted '(g)' by Notification No. G.S.R. 249(E), dated 29.3.2019 (w.e.f. 19.6.2017).] shall be called common credit, be denoted as 'C2' and calculated as -