Solicitor tools
Child Maintenance Calculator
Model CMS liability across shared care scenarios and export a court-ready summary. Drag the nights slider to see the money move as the overnight arrangement changes.
Everything is calculated in your browser. Nothing you enter leaves this page or is stored anywhere.
Paying parent
Approved employee and employer contributions are both deductible.
Children in the paying parent's household for whom Child Benefit is received.
0 nights/week · 0 nights/year
52 more nights per year moves this to the 1/7 reduction band, reducing liability by £11.54 per week.
Indicative weekly liability
£80.77
£350.00 per month · £4,200.04 per year
Rates verified: 1 July 2026
Liability at every shared care band
Same income and children, every overnight arrangement, side by side.
| Arrangement | Nights/year | Weekly | Monthly | Annual | Difference vs current |
|---|---|---|---|---|---|
| No shared careCurrent | 0–51 | £80.77 | £350.00 | £4,200.04 | — |
| 1 night/week | 52–103 | £69.23 | £300.00 | £3,599.96 | −£11.54 |
| 2 nights/week | 104–155 | £57.69 | £249.99 | £2,999.88 | −£23.08 |
| 3 nights/week | 156–174 | £46.15 | £199.98 | £2,399.80 | −£34.62 |
| Equal-ish (4+) | 175+ | £33.38 | £144.65 | £1,735.76 | −£47.39 |
Important
This is an indicative estimate produced by an automated tool using the statutory child maintenance formula under the 2012 scheme. It is not a Child Maintenance Service calculation, not a substitute for one, and not legal advice. Figures are based solely on the information entered and on rates in force at the date shown. Only the Child Maintenance Service can produce a binding assessment. Rates, thresholds and the underlying formula are subject to change, and the scheme is currently under review.
More tools for family law practitioners on the For solicitors page.