Under the Customs Act, 1962, the fundamental unit of assessment is the Bill of Entry (BOE). Duty liability is determined qua each BOE, and the self-assessment mechanism under section 17 also proceeds transaction-wise. Therefore, as a matter of legal principle, computation of "tax effect" for departmental appeals should ordinarily be BOE-specific.
Each BOE represents an independent assessment involving classification, valuation, exemption eligibility, rate of duty, and consequential liability. Hence, where demands relating to different BOEs are distinct and severable, tax effect should ideally be computed separately for each BOE.
However, in practical adjudication, show cause notices often cover multiple BOEs over different periods involving a common issue, and adjudicating/appellate authorities pass composite orders. In such circumstances, a purely BOE-wise computation may not always reflect the true nature of the dispute.
At the same time, adopting the aggregate duty involved in an entire order, irrespective of the number of BOEs or span of years covered, may also lead to artificial inflation of tax effect. Such an approach may be inappropriate where the order merely clubs independent transactions for administrative convenience.
In customs law, unlike direct taxes, the financial year is not the statutory unit for assessment. Customs duty is transaction-based and arises upon importation through a specific BOE. Therefore, computation of tax effect on a financial year basis does not appear legally aligned with the scheme of the Act.
Accordingly, the preferable approach would be:
(i) where BOEs are independent and issues are separable, tax effect should be determined BOE-wise; and
(ii) where the dispute involves a common and indivisible issue decided through a composite order, cumulative duty implication of the order may be considered.
Thus, the determinative factor should not be the financial year, but the nature of adjudication and whether the causes of action arising from different BOEs are legally severable or constitute one composite dispute.