Common
National Insurance number
Social security system number in the UK
National Insurance number
The National Insurance number is a number used in the United Kingdom, Guernsey, the Isle of Man and Jersey in the administration of the National Insurance or social security system. It is also used as a de facto national identification number in the UK, including in the tax system, banking, social welfare, online government services and electoral registration, despite it not being explicitly defined as such. The number is sometimes referred to with the abbreviations NINo or NINO.
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