In this scenario, their NI calculation is in two stages.
First, your software recalculates earnings on their original NI Category using the annual thresholds. This is to ensure they paid the right NI while on that category.
The second recalculation works out any NI due on the new NI category.
During the second recalculation, your software applies the relevant annual NI thresholds as below:
- The employee doesn't get any earnings below the PT (charged at 0%) on the new NI category. This is because they earned above the PT on their first NI category
- This means that any NI on the second NI category calculates on their earnings immediately
NOTE: This still applies to NI Category C. However, there's no employee NI on their earnings while on category C, as the employee NI rate on this category is 0%. - The Upper earnings limit (UEL) compares to their total earnings on either NI category. If it's above the UEL, the relevant NI rate applies to their earnings above this threshold
The net sum of these recalculations forms the total NI contributions due for the employee for the year.
FPS Liability
The FPS liability for employees in the final pay period of the year includes:
- The rebated NI contributions from the original NI category
- The total Employer NI contributions from the original NI category reallocated to the new NI Category
- Any Employers NIC in the final period
You can reconcile the FPS liability in the final period by totalling the following items:
- PAYE
- Student Loan
- Postgraduate Loan
- Total Employee NIC for months on original NI Category
- Total Employer's NIC for months on original NI Category
- Employee's NIC liability this period
- Employer's NIC liability this period