Practical Maritime Tax Issues — Part 5: Double Taxation in International Maritime Transport

Double taxation is one of the most significant tax and legal issues in international shipping, because maritime activity is, by its nature, cross-border and may involve more than one jurisdiction at the same time.

A single maritime transaction may connect several jurisdictions simultaneously: the country where the shipping company is incorporated or tax-resident, the jurisdiction in which the vessel is registered or operated, the place where services are actually performed, and the country in which the vessel enters port.

This overlap raises fundamental questions: Which jurisdiction has the right to tax the income or activity? Could the same stream of income be subject to tax in more than one country? And to what extent do Double Taxation Agreements (DTAs) limit, allocate, or resolve these competing claims?

The tax treatment of international maritime income or services may depend not only on where the service is performed, but also on the legal and commercial characterization of the underlying maritime activity. For example, whether a particular payment constitutes shipping income, a service fee, or a commercial charge may determine the applicable tax rules — and may affect the availability of treaty protections.

It is also important to recognize that international maritime transport often involves ancillary services — such as container handling, storage, loading and discharge, agency fees, and logistics — which may raise their own tax issues depending on whether they are treated as part of the international carriage or as separate taxable supplies.

For foreign shipowners, operators, agents, and other participants in international maritime trade, tax exposure should therefore be assessed not in isolation, but alongside the relevant shipping contract, agency arrangement, port operations, services actually performed, and the applicable domestic and international tax rules.

Early identification of potential double-taxation issues, combined with a clear understanding of the applicable treaty framework, can help reduce the risk of unexpected tax liabilities and disputes in multiple jurisdictions.