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.
Pension
Many countries offer state-sponsored retirement benefits, beyond those provided by employers, which are funded by payroll or other taxes. In the United States, the Social Security system is similar in function to a defined benefit pension arrangement, albeit one that is constructed differently from a pension offered by a private employer; however, Social Security is distinct in that there is no legally guaranteed level of benefits derived from the amount paid into the program.