Seafarers: National Insurance


HMRC Mariners Unit

Phone HMRC if you’re a mariner or seafarer to:

  • check you’re liable to pay NI
  • check you’re paying the correct amount NI
  • get advice on making voluntary NI contributions
  • check the status of your employer
  • claim a refund of NI

03000 582 419

Outside UK:
+44 3000 582 419

Opening times:

Monday to Friday: 8am to 4pm

Closed weekends.

National Insurance contributions International Caseworker

Phone HMRC to check your NI liability if you’re a resident of another country, your employer makes NI contributions on your behalf and you:

  • work for, or are paid by, a company based in the UK
  • work on a ship registered in the UK or Isle of Man
  • work in UK inshore waters
  • work on a ship engaged in exploration or exploitation of oil or gas in the designated UK sector of the Continental Shelf

0300 200 3500

0300 200 3519

Outside UK:
+44 191 203 7010

Opening times:

Monday to Friday: 8am to 8pm
Saturday: 8am to 4pm

Closed Sundays and bank holidays.

Find out about call charges


Write to this address if you have a query about National Insurance and work on a ship or offshore in the oil and gas industry in the designated UK sector of the Continental Shelf.

HM Revenue and Customs - Individuals and Small Business Compliance
Marine Group
NE98 1ZZ
United Kingdom