The following table provides a step by step framework for working out:
| Enter in this box the earnings to date (a) | 1 | |
| Enter in this box the amount at Step Seven (b) | 2 | |
| Enter in this box the secondary Class 1 NICs earnings threshold | 3 | |
| Enter in this box the secondary Class 1 NICs percentage rate | 4 | |
| Deduct the figure in box 1 from the figure in box 3 and enter the result in this box (e) | 5 | |
| Deduct the figure in box 5 from the figure in box 2 and enter the result in this box | 6 | |
| Multiply the figure in box 6 by 100 and enter the result in this box | 7 | |
| Add 100 to the figure in box 4 and enter the result in this box | 8 | |
| Divide the figure in box 7 by the figure in box 8 and enter the result in this box | 9 | |
| Add the figure in box 9 to the figure in box 5 and enter the result in this box (c) | 10 | |
| Deduct the figure in box 10 from the amount at box 2 (d) | 11 |