Hi Tony Chau,
To trace a NINO even if you don’t know it…
- Try setting up Personal Tax Account via gov.uk
, if sufficient security questions passed then NINO will be confirmed.
- Call the NI helpline on 0300 200 3500 and answer security questions – NINO will be sent in the post.
- CA5403 from gov.uk
fill in and submit by post, office will trace NINO and send confirmation by post.