I read that but that was resident workers working and living in France full time and paying tax and social costs in Ireland this isn't what we are talking about Silvertate
Sorry, Zav, I think you are wrong. The new rules state:
"However, under the new 'Home Base' rule aircrew and their employer will pay contributions to the Member State in which the 'Home Base' is situated. The 'Home Base' is where the crew member normally starts and ends their periods of duty. In most cases this will be in the state they live in. "
If your home base is Paris, or if most of your flights terminate in Paris, then Paris is where you pay the S.S. tax. They give the example of someone flying out from the UK, to do 5 days in Paris, and flying back to the UK. Your base is now Paris base, and you will be S.S. taxed there.
And it matters not if you are full-time or part-time, all that matters is where the majority of your flights start and terminate. If you work 6 months of the year, and 4 months are in Paris - then you are Paris based. End of story.
[ARCHIVED CONTENT] HM Revenue & Customs: National Insurance: New EU rules for flight and cabin crew working in two or more Member States
Anyone whose S.S. tax is not being paid in their home really needs to have a word with an advisor, because the fines are huge if you get it wrong. BALPA had a big thing about this recently, warning everyone to be careful because it is a hot-topic in the tax departments due to the blue-and-yellow issue.