CMS Overnight Bands: How Shared Care Affects Child Maintenance
CMS Overnight Bands: How Shared Care Affects Child Maintenance
The Child Maintenance Service (CMS) calculates child maintenance based on the paying parent's gross income — but the amount is reduced when the child spends overnight time with the paying parent. These reductions follow a statutory banding system, where more overnights mean lower maintenance payments.
Understanding how these bands work matters for parents in Wales who are negotiating custody schedules, because the financial impact of each extra overnight can be significant. But courts are clear: child arrangements and child maintenance are legally separate. Designing a schedule around CMS bands rather than around the child's welfare is something Cafcass Cymru officers and judges will recognise and respond to negatively.
The Five Shared Care Bands
The CMS uses overnight stays per year to calculate reductions. These bands apply to parents assessed under the Basic, Basic Plus, or Reduced rate categories:
Band 0: Fewer than 52 nights per year No reduction. The paying parent pays the full calculated amount.
Band A: 52-103 nights per year One-seventh reduction (14.29%) of the weekly maintenance per child. This band typically covers arrangements where the child spends one night per week with the paying parent.
Band B: 104-155 nights per year Two-sevenths reduction (28.57%). This covers arrangements like alternate weekends plus a midweek overnight.
Band C: 156-174 nights per year Three-sevenths reduction (42.86%). Close to equal time but not quite — perhaps alternating weeks with some adjustment for holidays.
Shared Care Equal: 175+ nights per year Fifty percent reduction, plus an additional £7 per week reduction for each child in this band. This covers true shared care arrangements like alternating weeks (7-7) or 2-2-5-5 rotations.
Even after all shared care reductions are applied, a paying parent on the Basic, Basic Plus, or Reduced rate must pay a statutory minimum of £7 per week.
The Flat-Rate Benefit Rule
If the paying parent receives prescribed state benefits (including Universal Credit), the CMS sets maintenance at a flat rate of £7 per week. If the child stays overnight for 52 or more nights per year with this parent, the maintenance obligation drops to nil — £0 — and they're exempt from paying for any other qualifying children in the household.
Equal Shared Care Doesn't Always Mean Nil Maintenance
A common misconception is that a perfect 50/50 overnight split automatically cancels child maintenance. It doesn't.
Under CMS regulations, maintenance is reduced to nil only if the paying parent shares overnight care almost equally (175+ nights) and shares equal day-to-day care. Following a landmark 2023 Upper Tribunal ruling, "day-to-day care" is assessed by looking at:
- Which parent is registered for and receives Child Benefit
- Which parent is the primary contact at school and the GP surgery
- Who arranges medical and dental appointments
- Who pays for childcare, school uniforms, and extracurricular activities
If one parent does most of this practical care work even though overnights are split equally, the CMS can still calculate a maintenance liability. The overnight bands reduce the amount, but they don't eliminate it unless day-to-day care is genuinely shared.
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How Common Custody Schedules Map to CMS Bands
To help parents see the financial picture alongside the scheduling picture:
- Alternate weekends only (Friday-Sunday, no midweek): ~52 nights/year → Band A (14% reduction)
- Alternate weekends + one midweek overnight: ~104 nights/year → Band B (29% reduction)
- Alternate weekends + two midweek overnights: ~156 nights/year → Band C (43% reduction)
- Alternating weeks (7-7): ~182 nights/year → Equal band (50%+ reduction)
- 2-2-5-5 rotation: ~182 nights/year → Equal band (50%+ reduction)
Holiday time can push borderline schedules into the next band. Adding school holiday overnights to an alternate-weekends arrangement might take it from Band A to Band B.
Why You Shouldn't Design Schedules Around CMS Bands
It's tempting to adjust a custody schedule by a few nights to cross a band threshold. But the family court and Cafcass Cymru assess arrangements through the welfare checklist, not through financial calculations. A parent who proposes adding one extra overnight specifically to move from Band A to Band B — without a child-welfare justification — sends the wrong signal.
The Welsh Pathfinder model front-loads investigation, which means Cafcass Cymru officers examine your proposed schedule early. If the schedule appears designed around financial outcomes rather than the child's routine, schooling, and attachment needs, the officer's Child Impact Report will note this.
Design the schedule around your child's needs first. Then understand the CMS consequences of that schedule.
The Wales Child Custody & Parenting Plan Guide includes a CMS overnight bands reference sheet alongside schedule templates, so you can see the financial implications of different arrangements while keeping the child's welfare at the centre of your planning.
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