Personal tax – form

National Insurance: get your National Insurance number in writing (CA5403)

Use form CA5403 to get written confirmation of your National Insurance number.

Documents

Get your National Insurance number in writing (CA5403)

Get your National Insurance number in writing (CA5403)

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Detail

Use form CA5403 to get written confirmation of your National Insurance number.

Alternatively, you can complete form CA5403 electronically and print out and send it to:

HM Revenue and Customs
National Insurance Contributions and Employer Office
National Insurance Registrations
Benton Park View
Newcastle upon Tyne
NE98 1ZZ

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Apply for a National Insurance number
Guidance on how to get a National Insurance number.