Temporary Numbers
In the past, employers sometimes allocated their employees a temporary insurance number, which followed the format "TN dd mm yy x", where 'TN' stands for temporary number and is static and x is usually M for male or F for female and the numbers in the midsection are the employee's date of birth. In the case of a woman born on 31 December 1958, for example, the temporary NI number would most likely be TN 31 12 58 F. Temporary NI numbers cannot be used to trace back any NI credits or personal details. The government now discourages the use of these numbers.
Another type of temporary NI number is the Revenue-issued "temporary reference" used when HMRC is unable to trace a taxpayer's original NI number. It follows the format 63T12345.
Read more about this topic: National Insurance Number
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