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Starting work 5 min read Updated 12 Feb 2026

NI number for agencies and zero-hours roles: what they usually ask for

A simple explanation of onboarding paperwork and why agencies want your NI details early.


Agencies often onboard quickly and want your NI number early so they can set you up on payroll and report earnings correctly.

  • If you have it, provide it.
  • If you do not have it to hand, tell them you will provide it as soon as possible.
  • Keep your first payslip and check the details.

Official steps: GOV.UK — Start a new job.


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