National Insurance number
The National Insurance number is used as a reference number in the Pay As You Earn system, and also by the self-employed. It is also used in applications for Individual Savings Accounts (ISAs), to check that an individual has opened only one ISA in a tax year.
Jobseeker's Allowance
Jobseeker's Allowance (JSA) is an unemployment benefit paid by the Government of the United Kingdom to people who are unemployed and actively seeking work. It is part of the social security benefits system and is intended to cover living expenses while the claimant is out of work.