Hong Kong Seafarer & Maritime Employee Tax — Expert Advisory

Hong Kong seafarers pay salaries tax on income from their employment with apportionment for sea service. The deduction is calculated as: (Sea service days outside HK waters / Total year days) × Total employment income. The key is defining "sea service days outside HK waters" — typically days when the vessel is outside HK territorial waters, including days in port overseas, passage days, and anchor days in international waters. Days in HK port and days of home leave in HK are not excluded.

Supporting documents include: crew agreement (contract of employment); vessel discharge book or service record; voyage logs or trip sheets showing departure and arrival times and ports; payslips showing sea pay; and any offshore work records. The IRD may request these documents when reviewing a salaries tax return with a significant apportionment claim. Keeping copies of all voyage records is essential — the shipping company's records are the primary source, but seafarers should maintain personal copies.

The apportionment applies to employment income earned during sea service — i.e., working on a vessel operating outside HK waters. Shore-based maritime jobs (port management, shipping administration, ship agency) do not qualify for sea service apportionment — they are standard employment income fully taxable in HK. Offshore platform workers (oil rigs, floating production units) in international waters may qualify for a similar apportionment analysis.

Generally, international seafarers are not subject to income tax in port states (countries whose ports they visit) on their seafaring wages — most countries have domestic exemptions for crew of foreign-flagged ships. However, some countries (notably the UK for UK-flagged vessel crew) do tax their own residents on worldwide seafaring income. HK tax treaties can reduce double taxation where it arises. The "flag state" (country where the vessel is registered) may also impose tax — Liberia and Cayman (common flags) do not tax seafarers.

If your employer has included your full salary on IR56B without any sea service apportionment deduction, you can claim the apportionment when filing your personal salaries tax return (BIR60) — the employer's reporting does not prevent you from claiming the deduction. You may need to provide your own sea service documentation to the IRD. Alternatively, if the error is the employer's, the employer can file a revised IR56B or supplementary form with the IRD.