National Insurance number
Your permanent tax and benefits reference.
The decision here
Have you applied, and do you have the reference to quote if asked?
What to know before you act
- You can legally start work before your number arrives — an employer refusing on that basis is wrong.
- Some visas print the number on the original documents; check before applying again.
- It never changes and is never reissued as a different number.
Do this
- Open step
Get or confirm your National Insurance number
Apply for an NI number, or find the one already issued to you.
If you get stuck
No response weeks after applying
Usually because: Backlog or an address mismatch.
Do this instead: Keep your application reference, chase through the official helpline, and give your employer the reference meanwhile.
Official sources
Where this comes from
- Source
- GOV.UK (HMRC / DWP)
- Applies to
- UK-wide
- Last checked
- 12 September 2026
- Next review
- 12 October 2026
- Rule status
- Current rule
- Risk
- Medium risk
Why this applies to you: Your earnings need to be recorded against the right National Insurance record.
Agumba explains and orders official guidance. It is not legal or immigration advice. Always confirm the detail on the official page before acting.
Something to help you finish this
Your First 30 Days in the UK
The foundation tasks of your first month, in order, without information overload.
What you end up with: A written order of your first-month tasks and what each one unlocks.