National Insurance: application for refund of Class 4 National Insurance contributions (CA5610)
Use the online form to apply for a refund of Class 4 National Insurance contributions.
Ref: CA5610 https://public-online.hmrc.gov.uk/lc/content/xfaforms/profiles/forms.html?contentRoot=repository:///Applications/NICs_iForms/1.0/CA5610&template=CA5610.xdp
To apply for a refund of Class 4 National Insurance contributions you can:
- use the online service (sign in to or set up a Government Gateway account)
- fill in the postal form on-screen, print and post it to HM Revenue and Customs
If you use the online form, you’ll get a reference number that you can use to track the progress of your form.
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 and post it. You can’t save a partly filled in form so you should gather all your information together before you start to fill it in.