This helpline may ask you some security questions. Make sure your personal details and address are up to date in your personal tax account or you could fail telephone security. If you do not already have a personal tax account, you can set one up.
if you’re self-employed and have a National Insurance enquiry or need to report changes to your personal details
to register for National Insurance, Income Tax and VAT if you’ve recently become self-employed
You can use Relay UK if you cannot hear or speak on the phone: dial 18001 then 0300 200 3100.