National Insurance: apply for a portable document A1/E101 if self-employed in European Economic Area (CA3837)

You or your agent can use the online form service or postal form to apply for form A1/E101 to confirm you remain in the UK National Insurance scheme.


Apply online if you're an individual

Apply online if you're an agent

Apply by post if you’re an agent or you can't use the online form


Use this form if you’re normally self-employed in the UK and going to work temporarily in another country within the European Economic Area (EEA). This form will enable HM Revenue and Customs (HMRC) to determine which member state’s social security legislation will apply.

If you’re a director of your own limited company you should complete forms CA3821 and CA3822.

Use the online form service (sign-in or set up a Government Gateway account)

You may need to give HMRC additional information to support this form.

Fill in and submit this form online but send any additional information to us by post. You’ll be given a unique reference number when you submit the form. Include this number with the additional information you send by post (address below). You can track the progress of the form online using the same reference number.

Before you start using the postal form

If you’re using an older browser, for example Internet Explorer 8, you’ll need to update it or use a different browser. Find out more about browsers.

You’ll need to fill in the postal form fully before you can print it. You can’t save a partly completed form so you should gather all your information together before you start to fill it in.

National Insurance if you go abroad
Contact HMRC to find out if you need to pay National Insurance when you work abroad.

Published 11 August 2014
Last updated 20 October 2017 + show all updates
  1. Information about completing forms CA3821 and CA3822 if you're a director of your own limited company has been added.
  2. Agent apply online (sign in or setup a Government Gateway account) link added to the page.
  3. An online service is now available.
  4. First published.