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  • Breadcrumb

    1. Home
    2. Family, home and community
    3. Parenting and childcare
    4. Child Maintenance Service
    5. Having a child maintenance arrangement
    6. Child maintenance

    How child maintenance is calculated

    The Child Maintenance Service (CMS) follows six steps to work out child maintenance payments. This is reviewed each year and any changes in circumstances are considered. The ‘paying parent’ is the parent the child doesn’t live with. The parent or carer they live with is the ‘receiving parent’.

    Step one - working out income

    CMS will find out the paying parent’s yearly gross income from information supplied by HM Revenue and Customs (HMRC) and check if they’re getting benefits (student grants and loans don’t count as income).

    • How Child Maintenance Service calculates your income

    Step two - looking at what affects income

    CMS will check for what could change the gross income amount of the paying parent such as pension payments and other children they support. Then it’ll convert the yearly gross income into a weekly figure.

    • Paying parent income adjustments

    Step three - child maintenance rates

    One of five rates will be applied, based on the gross weekly income of the paying parent:

    Gross Weekly Income Rate
    Below £7 Nil
    £100 or less, or if the paying parent gets certain benefits Flat
    £100.01 to £199.99 Reduced
    £200 to 800 Basic

    £800.01 to £3,000

    Basic Plus
    • Child maintenance rates explained 

    Step four - other children

    CMS will take into account the number of children the paying parent has to pay child maintenance for, including other children living with them and any arrangements that have been made directly with an ex-partner.

    • Paying parent income adjustments

    Step five - weekly amount of child maintenance

    Using information from the first four steps, CMS calculates the weekly child maintenance amount.

    Step six - shared care

    This is when a child stays overnight with the paying parent. CMS will make a deduction to the weekly child maintenance amount based on the average number of ‘shared care’ nights a week. 

    • Shared care in child maintenance cases

    Collection fees

    Parents who pay or receive child maintenance using the Collect and Pay Service will have to pay a collection fee each time they make or receive a payment.

    • Collection fees and enforcement charges 
    • Child maintenance payments
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    Child maintenance

    • Changes Child Maintenance Service needs to know
    • Child maintenance appeals and complaints
    • Child maintenance payments
    • Child maintenance rates explained
    • Disputing parentage
    • DNA testing in disputes over parentage
    • How child maintenance Annual Review works
    • How child maintenance is calculated
    • How Child Maintenance Service calculates your income
    • Paying parent income adjustments
    • Shared care in child maintenance cases
    • What happens if you don't pay child maintenance

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