Can you start work without a National Insurance number?

What to tell your employer, what they can ask for, and what to do while your NI number is pending.

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In many cases, you can start a new job even if you do not yet have your National Insurance (NI) number to hand. Employers often prefer to have it early for payroll records, but you can usually provide it later once you find it or once it is issued.

What to say to your employer

• Tell them you will provide your NI number as soon as you locate it or it is issued.
• If you do not have a P45, ask if they want you to complete a starter checklist.
• Keep a note of who you spoke to and the date, in case payroll queries it later.

Starter checklist (if you do not have a P45)

If you are starting work and you do not have a P45 from a previous job, your employer may ask you to complete the HMRC starter checklist. This helps them apply the correct tax code as early as possible.

Official starter checklist guidance (GOV.UK)

First, try to find your NI number

Your NI number is often shown on payslips, P60s, letters about tax/benefits, or your online HMRC account.

Official: Find your National Insurance number (GOV.UK)

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