
Aadrikaa Legal Services (ALS) – IDT Tax I Arbitration I Litigation
Date: 19.05.2026
Calcutta High Court Clarifies Unjust Enrichment and Refund Rights for Government Undertakings Under Customs Act

This Short Article has been prepared & written by Advocate Ravi Shekhar Jha-Delhi High Court, New Delhi. The views expressed are based on his interpretation of the law. He can be reached at his email id intelconsul@gmail.com .
The recent judgment by the Calcutta High Court in the case of Dredging Corporation of India Limited (DCI) versus the Commissioner of Customs (Port), Kolkata, addresses crucial issues regarding customs duty assessment, refund claims, and the doctrine of unjust enrichment under the Customs Act, 1962. This article provides a detailed overview of the case, the legal questions involved, and the implications for government undertakings and importers.
Background of the Case
Dredging Corporation of India, a Government of India undertaking, entered into a contract with Kolkata Port Trust for dredging operations. To fulfill this contract, DCI imported a cutter suction dredger along with accessories and spares from a Dutch supplier. The customs authorities provisionally assessed the imported goods, raising doubts about the eligibility of spares and accessories for concessional duty rates under the Accessories (Conditions) Rules, 1963 and Notification No. 133/87-Cus.
Key Events:
- Provisional Assessment: Three bills of entry were filed in early 1991, and duty was paid provisionally.
- Dispute on Duty Rate: Customs authorities denied the benefit of concessional rates for spares and accessories, leading to higher duty payments.
- Appeals and Tribunal Decision: DCI appealed, and the tribunal eventually ruled in their favor, recognizing accessories and spares as indispensable parts of the main vessel.
- Refund Claim: DCI filed for a refund of excess duty paid, but the claim was initially rejected on grounds of limitation and alleged unjust enrichment.
Legal Issues Considered
The revenue department raised two main questions:
- Whether the tribunal properly appreciated Section 28D of the Customs Act, 1962 (regarding unjust enrichment).
- Whether the tribunal was required to verify the application of Section 28D before upholding the refund order.
The Doctrine of Unjust Enrichment
Unjust enrichment prevents a claimant from receiving a refund if the burden of duty has been passed on to another party. The authorities repeatedly credited the refund amount to the Consumer Welfare Fund, arguing that DCI had not proven the duty was not passed on.
Courtβs Analysis:
- The appellate authority found no evidence that DCI had passed on the duty, especially since the imported vessel and its equipment were still in use and not sold.
- Certificates from DCIβs Chartered Accountant and Director (Operations and Technical) confirmed the goods remained with DCI.
- The court distinguished this case from others where unjust enrichment was established, noting that DCIβs situation was unique and the refund claim was not time-barred.
Final Judgment and Implications
The High Court dismissed the revenueβs appeal, affirming that:
- The refund claim was within the limitation period.
- The entitlement to refund had attained finality through multiple appellate decisions.
- The doctrine of unjust enrichment did not apply, as DCI had not passed on the duty burden.
Key Takeaways:
- Government Undertakings: The judgment reinforces that unjust enrichment principles may not apply when goods remain in use and are not sold or transferred.
- Refund Claims: Importers should maintain clear documentation to prove non-transfer of duty burden.
- Legal Precedent: The case sets a precedent for similar disputes involving provisional assessments and refund claims under the Customs Act.
Conclusion
This judgment provides clarity on the application of unjust enrichment in customs refund cases, especially for government undertakings. It underscores the importance of factual evidence and the need for authorities to avoid prolonged litigation when the legal position is clear. Importers and legal practitioners should take note of the courtβs reasoning and ensure robust documentation in customs matters.
Source: Calcutta High Court
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