Class 1 NICs are late paid if they are paid outside certain time limits and HMRC considers that the employee
When an employee pays any primary Class 1 NICs after an opinion on negligence has been issued, they must be recorded on the employee’s National Insurance account with a status of “paid”, see NIM12129.
Class 1 NICs are accepted as being paid on time if they are paid before the first Sunday in January following the end of the tax year in which they were due.
Class 1 NICs are late (L) if they are paid
They still count for benefit purposes.
Class 1 NICs are extra late (LX) if they are paid after the end
of the second tax year in which they were due. They do
not count for benefit purposes.
Enquiries about how benefit is affected should be referred to
DWP.