NIM29010 | Special cases: Class 1 - mariners: DL offshore contracts
From HM Revenue & Customs · National Insurance Manual
For many years the UK shipping industry has transferred significant numbers of employment contracts either to non-UK members of shipping groups or unconnected offshore employers. This was to remain competitive with operators in other jurisdictions by avoiding the payment of secondary contributions (by not being resident or having a place of business in UK).
A strong indication that there is a place of business in UK is where a company is registered under the Companies Acts. But, whether there is a place of business in UK will be a question of fact based on the individual case.
Where an entity which is not resident or does not have a place of business in UK pays mariners, evidence will be needed to decide whether that entity is the employer. Such evidence may come from:
contracts of employments
agreements with shipping unions
disciplinary agreements, payroll procedures
establishing who remains liable for the payment of earnings if the ship owner or cruise operator was to default on fees due to the offshore entity
establishing who holds employers’ liability insurance