Exclusion of book profits: tonnage tax income is removed from MAT computation to preserve the presumptive shipping regime.
Clause 228(16) excludes the book profit or loss derived from the activities of a tonnage tax company, as defined in Clause 228(1), from the company's book profit for the purposes of section 206, thereby preventing MAT from applying to profits attributable to qualifying core and incidental shipping activities; the exclusion operates alongside detailed provisions on caps for incidental income, allocation of costs and depreciation, treatment of non qualifying ships, and transfer pricing adjustments.

Allocation of shared costs and depreciation: apportionment on reasonable basis and fair proportion affects tonnage tax computations.
Clause 228(14) requires common costs attributable to the tonnage tax business to be allocated on a reasonable basis, with taxpayers maintaining records to support apportionment. Clause 228(15) requires depreciation for assets other than qualifying ships to be apportioned on a fair proportion determined by the Assessing Officer with reference to actual use. Both provisions mirror Section 115VJ, vesting discretion in the AO and preserving the objective of preventing tax arbitrage while increasing documentation and compliance burdens.

Tonnage tax regime: clarifies qualifying shipping income, market value inter company valuation, and related party anti avoidance adjustments.
Tonnage tax applies to qualifying shipping income measured by net tonnage, defined as profits from specified core shipping activities and prescribed incidental activities; incidental income above a prescribed threshold is excluded. Inter business transfers must be computed at market value, with assessing officer power to use reasonable bases in exceptional cases. Related party arrangements producing more than ordinary profits may be adjusted to reasonable levels. The Central Government may exclude activities or set limits by notification subject to parliamentary laying. Losses in tonnage computation are ignored.