CMS Calculation Example: £3,000 weekly limit

The Rates of Child Support and Qualifying & Relevant Children pages help to explain the parameters used for Child Support calculation.

There is a free online calculator, however, please be aware this is a very basic calculator. We can help with more advanced calculations, such as other children resident in your home (as an NRP), etc., as demonstrated below. Alternatively, if you think you have been assessed incorrectly, request a consultation with us, by clicking Request a Consultation.

CMS Calculation where NRP earns in excess of the £3,000 weekly limit

Tony, the non-resident parent (NRP) is due to pay Child Support to Shona, the resident parent (RP) for two qualifying children. Tony lives with his new partner, Gemma, and Gemma has two children from a previous relationship.

Tony is a company director, and pays himself a salary and dividends. His salary is kept below the Lower Earnings Limit (LEL) where employees do not pay National Insurance but get the benefits of paying. In 2020/2021 this is £120 per week. He then takes dividends throughout the year, totalling £243,360 which equates to £4,680 per week.

Tony’s gross income is £4,800 per week. The ‘basic rate plus’ of child support applies because his gross weekly income is over £800 per week.

Step One:

Gross Weekly income = £4,800

The maximum amount of gross weekly income that can be included in the Child Support calculation is £3,000.

Gross weekly income (for the purposes of this calculation) = £3,000

There is 14% reduction as there are two relevant other children = £420

Gross Weekly income after the reduction for relevant other children = £2,580

Income between £0 and £800 = £800

Income over £800 = £1,780

Step Two:

There are two qualifying children, so child support is 16% of £800 plus 12% of the excess above £800 (£1,780) in this example).

16% of £800 = £128

12% of £1,780 = £213.60

£128 + £213.60 = £341.60

Tony is due to pay £341.60 child support per week to Shona.

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Basic rate; reduction in gross income for relevant other children

Number of relevant other childrenPercentage by which gross income is reduced
One11%
Two14%
Three16%

Basic rate; percentages used to calculate Child Support payable are shown below:

Number of
qualifying children (including
relevant non-resident children)
Percentage of
gross income
up to £800
Percentage of
gross income
above £800
One12%9%
Two16%12%
Three or more19%15%

Further examples of calculations can be found by clicking here.

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