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.
Welfare Reform Act 2012
The Welfare Reform Act 2012 is an Act of Parliament in the United Kingdom which makes changes to the rules concerning a number of benefits offered within the British social security system. It was enacted by the Parliament of the United Kingdom on 8 March 2012.