I want to logon to the Tax authority (Belastingdienst), Customs (Douane) or Empoyee Insurance Agency (UWV) on behalf of my sole proprietorship.

Some authorities require your Social security number to be linked to your eHerkenning. You can do this by following these steps:

1. Log on to My Reconi
2. Go to ‘My Account’ and select ‘My Data’:  
   
3. A new screen will open. At the bottom of the page, you can click on ‘Activate BSN’:
   
4. In the new screen, you will see the terms and conditions for linking your Social security number (BSN). Then choose your sole proprietorship under ‘organisation’ and select ‘agree’.