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HMRC internal manual

National Insurance Manual

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Class 4 NICs: structure: annual Class 4 NICs maximum from 6 April 2003 to 5 April 2011: contributors who are employed and self-employed: examples: Case 3 of regulation 100(3): profits exceed the UPL

NIM24170 onwards provides guidance on the calculation method used to determine the Class 1, 2 and 4 NICs annual maximum liability for a contributor who is both employed and self-employed during the same tax year. The calculation method shown applies to tax years from 2003/2004 onwards. For guidance on the Class 1, 2 and 4 NICs annual maximum for tax years before 2003/2004 see NIM24120 onwards.

The following example illustrates the Class 1, 2 and 4 NICs annual maximum calculation for a contributor who falls into Case 3 of regulation 100(3). In this example the contributor’s profits exceed the Upper Profits Limit (UPL) and he is required to pay Class 4 NICs at the additional Class 4 percentage. Since the amount of Class 1 and 2 NICs that the contributor has paid exceeds the Class 2 and main percentage Class 4 NICs maximum, the contributor is also required to pay Class 4 NICs at a rate of 1% on all of his profits between the Lower Profits Limit (LPL) and UPL. The contributor is not required to pay any Class 4 NICs at a rate of 8%. This example should be read in conjunction with NIM24175 and NIM24178 

The example uses the rates and limits in force during the 2010/2011 tax year.

Example

Mr Wiggins has been self-employed for the whole of the 2010/2011 tax year. His profits for the year are £120,000. He has paid a total of £3814.05 in Class 4 NICs, of which £3052.80 is main percentage Class 4 NICs. He has paid 52 Class 2 NICs at £2.40. Mr Wiggins was also employed during the 2010/2011 tax year and has paid £4000 in Class 1 NICs, of which 3694.32 was paid at the main Class 1 percentage. Mr Wiggins’ maximum Class 1, 2 and 4 NICs liability is calculated as follows.

Step 1

Subtract the LPL from the UPL

£43875 - £5715 = £38160

Step 2

Multiply the result of step 1 by 8%

£38160 x 8% = £3052.80

Step 3

Add to the result of step 2, 53 times the weekly rate of Class 2 NICs

£3052.80 + (53 x £2.40) = £3180

Step 4

Subtract from the result of step 3 the aggregate amount of any Class 2 NICs and any primary Class 1 NICs paid at the main primary percentage. [NB - Class 1 main percentage payment is £3694.32]

£3180 - £3819.12 = minus £639.12

Which Case of regulation 100(3) does Mr Wiggins fall into?

If the result of step 4 is a negative figure there are no Class 4 NICs payable at the main Class 4 percentage and the result of step 4 is treated as nil.

As the figure produced by step 4 is a negative figure Mr Wiggins falls into Case 3 of regulation 100(3). Case 3 provides that the figure of Class 4 NICs produced at step 4 is treated as nil. It is then necessary to go to step 5 to 9 of regulation 100(3).

Step 5

Multiply the result of step 4 by 100/8

nil x 100/8 = nil

Step 6

Subtract the LPL from the lesser of the UPL and the actual amount of profits for the year.

£43875 - £5715 = £38160

Step 7

Subtract the result of step 5 from the result of step 6.

£38160 - nil = £38160

Step 8

Multiply the result of step 7 by 1%

£38160 x 1% = £381.60

Step 9

Multiply by 1% the amount of profits in excess of the UPL

(£120000 - £43875) x 1% = £761.25.

Step 10

Add together steps 4, 8 and 9

nil + £381.60 + £761.25 = £1142.85

Mr Wiggins’ annual Class 4 NICs liability amounts to £1142.85. He is due to pay Class 4 NICs at 1% on all of his profits between the LPL and UPL. As he has profits above the UPL he is also liable for Class 4 NICs at the additional percentage. As Mr Wiggins has paid a total of Class 4 NICs amounting to £3814.05 he is due a Class 4 NICs refund.