Free Calculator · 2025 CMS Rates · England & Wales

Child Maintenance Calculator

Calculate what the Child Maintenance Service would calculate based on the paying parent's income and the number of nights the child stays. Know the number before any conversation.

Paying Parent's Income

The parent who doesn't have the child living with them most of the time

Gross annual income

Income type

Other children living with paying parent

Pension contributions (annual)

Children

Children the maintenance is being calculated for

Number of qualifying children

Overnight stays with paying parent (per year)

Shared care thresholds: 52+ nights (1/7 deduction) · 104+ nights (2/7) · 156+ nights (3/7) · 175+ nights (half rate)

Private Agreement (optional)

If you already have an agreed amount, enter it to compare against the CMS figure

Current or proposed monthly amount

CMS calculation — here's the figure

CMS weekly amount

£0 per week

Monthly (×52÷12)

£0

Annual total

£0

Private agreement

£0

Shared care deduction

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Save this calculation — download as PDF

Enter your email and your full CMS calculation downloads instantly as a PDF. Useful to have to hand for any conversation. We'll also send you the free Starter Pack.

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This calculator uses the standard CMS formula for 2024. It is for guidance only and does not account for all circumstances (e.g. very high incomes above £156,000, certain benefit situations, or unearned income). Always verify with the Child Maintenance Service directly at gov.uk/calculate-your-child-maintenance.