Class 1 Structural Overview: The Primary Threshold ('PT') and the Secondary Threshold ('ST')
Section 5, SSCBA 1992 and regulations 10 & 11
The Primary Threshold (‘PT’) and Secondary Threshold (‘ST’) represent the points from which payment of NICs arises, as opposed to the point at which entitlement to benefit builds up and which is set by the LEL (NIM01005). The PT and ST are currently (2001 to 2002) aligned with the Income Tax personal allowance. The PT and ST are set at the same level for both employees’ and employers’ NICs (see NIM01011). The monthly and yearly PT and ST are fixed each year. For guidance on how to calculate the PT and the ST for pay intervals of other than one month or one year, see NIM01010.