Tonnage tax compliance requires reserve creation, training, chartering limits, separate accounts, and timely reporting to preserve scheme eligibility.

Tonnage tax companies must create a reserve from qualifying shipping book profit and use it within eight years to acquire a new ship or inland vessel, subject to limited interim business use. Improper use, non-use, early transfer of an acquired vessel, or inadequate reserve creation causes a proportionate part of shipping income to be taxed under other provisions; repeated reserve failures terminate the option. Training compliance, chartering limits, separate accounts, and an accountant's report are continuing conditions.

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