Port dues are the port authority’s charge on the ship for entering and using the port: the general infrastructure charge, distinct from service charges (pilotage, towage, mooring) and from charges on the cargo (wharfage, THC). Most of the world’s ports tariff them against the vessel’s gross tonnage under the ITC 1969 convention, per GT or per 100 GT, decorated with per-call minimums, size bands, caps, duration elements, and rebate schemes for frequent callers and environmentally-rated tonnage.
The full article will cover tariff design across major port authorities, green-rebate schemes (ESI and equivalents), duration-based dues and laid-up rates, and how dues interact with the rest of the disbursement account in voyage estimation.
Compute the line with the port dues calculator and place it in context with the port disbursement account estimator.