National Insurance Number format

Jeremy Hilton made this Freedom of Information request to HM Revenue and Customs

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HM Revenue and Customs did not have the information requested.

Dear HM Revenue and Customs,

I understand that the National Insurance Number (NINO) is in the format "AA NN NN NN A", where A represents a letter and N a number from 0–9.

Could you please provide the following information under the Freedom of Information Act:

1. A list of the two-letter combinations ever used as the first two characters of NINOs so far issued to people in the UK.

2. A list of the two-letter combinations ever used as the first two characters of NINOs used for administrative or other special reasons (e.g. "TN", "MW", "PP").

3. A list of the two-letter combinations scheduled to be used as the first two characters of future NINOs for people in the UK.

4. A list of the two-letter combinations scheduled to be used as the first two characters of future NINOs for administrative or other special reasons.

5. A list of letters ever used as the final (9th) character of NINOs.

6. The reasons why "GB", "BG", "NK", "KN", "NT", and "ZZ" cannot be used as the first two characters of a NINO.

7. The reasons why "F", "M", and "P" were used as the final (9th) character of NINOs.

Could you also answer the following questions:

1. Is it true that the numbers (the 3rd–8th characters) of NINOs are allocated consecutively from "000000" to "999999"? (And if not, how are they allocated? And from what starting number does the allocation begin? And at which number does it end?)

2. Do any of the characters of NINOs act as a "check digit" by which the validity of the NINO can be verified (using the other constituent characters of the NINO)?

Yours faithfully,

Jeremy Hilton

HM Revenue and Customs

FOI 2461/13

 

Thank you for your communication of 6 September 2013 which has been passed
to HMRC’s Freedom of Information Team. 

 

We have allocated the above reference which you should quote if you need
to contact us. 

 

The Team will arrange for a reply to be sent to you which will either
comply with HMRC’s obligations under Freedom of Information Act or, if we
think it’s an enquiry that we don’t need to address under the terms of the
Act, let you know why.  If it is the latter we will, if possible, pass it
on to a more appropriate part of the Department for answer. 

 

HMRC

Freedom of Information Team

 

 

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HM Revenue and Customs

1 Attachment

Dear Mr Hilton
Please find attached the response to your request made under the Freedom
of Information Act 2000.
<<FOI 2461-13 Response.pdf>>


Thank you

HMRC Freedom of Information Act Team
Room 1C/23
100 Parliament Street
London
SW1A 2BQ

fax: 03000 586902
[email address]

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Dear HM Revenue and Customs,

Thank you—I'll get in touch with the DWP then.

Yours faithfully,
Jeremy Hilton