Book profit computation for MAT: use Ind AS net profit excluding other comprehensive income, with timing rules for unrealised items. The MAT book profit for Ind AS-compliant companies should, as a general rule, be the net profit excluding net other comprehensive income, subject only to the adjustments already specified in section 115JB. Permanent OCI items that will never be reclassified to profit or loss should be included in book profit at specified times (revaluation and fair-value equity gains on realisation; defined benefit plan remeasurements annually). Transition adjustments on first-time adoption should be included in book profit according to whether and when they are reclassified or realised.