Let HMRC know when you’re sending employees to work in the EEA, so that we can determine which member state’s social security legislation will apply. You can:
use the online form (sign into, or set up a Government Gateway account)
fill in the form on-screen, print it off and post it to HMRC
If this is the first time your company has contacted us about sending employees to another country you should also fill in form CA3821.
If you use the online form, you’ll get a reference number that you can use to track the progress of your form. To tell HMRC you’ll need to have your Unique Taxpayer Reference number (UTR) or VAT reference number in your Business Tax Account. You can add this from your account homepage.
If you carry out offshore work on a ship, you’ll need to use the postal version of this form. This is because you’ll need to include a mariner’s discharge book and questionnaire.
Fill in the form and send this together with the mariners questionnaire and a copy of yours or the employee’s mariner’s discharge book to Marine National Insurance contributions office at the address shown on the mariner’s questionnaire. If you submit the form this way, you cannot track its progress on line.