NIM09310 | Earnings Periods: Statutory Payments: Lump sum payments
From HM Revenue & Customs · National Insurance Manual
Section 4(1) of the Social Security Contributions and Benefits Act 1992 (SSCBA 1992)
If the employer makes a lump sum payment of any Statutory Payment, such as:
Statutory Sick Pay (SSP),
Statutory Maternity Pay (SMP),
Statutory Paternity Pay (SPP),
Statutory Adoption Pay (SAP)
Shared Parental Pay (ShPP) or
Statutory Parental Bereavement Pay (SPBP)
to an employee and the employee’s employment has:
not ended, treat the lump sum payment as part of the pay in the earnings period in which the employer pays it and calculate the NICs on the total amount; or
ended and regular payments have stopped, the earnings period is a week