The best place to check for an overall picture is directly on the HMRC website, via the Government Gateway facility.
If you are registered self-employed or through CIS (Construction Industry Scheme), its a good idea to get set up with a Government Gateway account so you can track your tax and overall earnings.
1) Setting Up an Account
If you don't have a gateway login already, you can easily set one up here: https://www.access.service.gov.uk/login/signin/creds.
Once you have entered your preferred login details, you'll be issued with a GatewayID. Please ensure you keep this safe, as you may need this to access your account later on.
Self Employed & CIS
After you’ve received your Government Gateway user ID, you’ll need to sign in and complete your self-employed registration online. HMRC will need a couple of critical pieces of information from you, including:
- The date you started trading
- The type of tax you want to add (Self-Assessment)
- National Insurance number
- Home address and contact details
- The type of self-employed work you do