National Insurance: apply for a portable document A1/E101 if self-employed in European Economic Area (CA3837)
Use the online service or postal form to apply for form A1/E101 to confirm you remain in the UK National Insurance scheme.
Ref: CA3837 https://public-online.hmrc.gov.uk/lc/content/xfaforms/profiles/forms.html?contentRoot=repository:///Applications/NICs_iForms/1.0/CA3837&template=CA3837.xdp
When to use this form
This form should be used by a person who is normally self-employed in the UK and is going to work temporarily in another country within the European Economic Area (EEA). The form will enable HM Revenue and Customs (HMRC) to determine which member state’s social security legislation will apply.
Use the online 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.
Fill in form on-screen, print and post to HMRC
Instead of applying online, you can download this form, fill it in and send it to us along with the additional information. If you submit the form this way, you can’t track its progress online.
Send your form and any additional information to:
HM Revenue and Customs
You’ll need to fill in the 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.
If you are 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.
This form will help HMRC to determine which member state’s social security legislation will apply. If you normally work in 2 or more EEA countries you should fill in form CA8421i instead.
Applicable countries within the EEA:
Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, UK.
If you’re an EEA national, social security liability is determined by EC Regulation 883/04.
If you aren’t an EEA national, but are legally resident in an EU member state, social security legislation is determined by EC Regulation 1408/71.
Published: 11 August 2014
Updated: 12 January 2017
- Agent apply online (sign in or setup a Government Gateway account) link added to the page.
- An online service is now available.
- First published.