The following Employment Tax guidance note by Tolley provides comprehensive and up to date tax information covering:
The basis of calculation of NICs due on a payment to an employee is based on the concept of ‘earnings periods’. SI 2001/1004, regs 2–9 set out the rules for employees paid at different intervals, namely:
HMRC guidance is in NIM08000 onwards.
Class 1 NICs are calculated by reference to earnings periods rather than on a cumulative or an annual basis (although in certain circumstances, an individual’s earnings period can be one year).
Calculating the Class 1 NIC liability by reference to earnings periods means that the limits and thresholds are worked out per earnings period and used to determine the NIC liability for that earnings period. The Class 1 NIC liability for a year is the total of the liability determined for all earnings periods in that year. This differs from the treatment for tax where the liability is based on total earnings for the year. As a result, if a person works only for a few weeks in a year, they are likely to get a refund of tax, but the Class 1 NIC collected via PAYE will be correct as it is based on each individual earnings period.
The most common earnings periods are one week or one month and the HMRC tables of NIC thresholds include details of what each threshold is per week and per month as well as the overall yearly figure.
The date of payment is the date when NICs are due and, therefore, the due date is governed by the method of pay.
Cash ― the date
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