What is a National Insurance number used for?
A clear overview: payroll records, National Insurance contributions, and why employers ask for it.
Your National Insurance number is your personal reference for National Insurance contributions and tax records. Employers commonly ask for it so they can record earnings and contributions correctly.
Official overview: GOV.UK — Start a new job.
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For official information, you can also verify guidance via GOV.UK and HM Land Registry Practice Guides. We are an independent service and not HM Land Registry.