Child Maintenance and Divorce UK: CMS, Court Orders, and What You Actually Pay

Your divorce financial settlement and child maintenance are two separate legal processes that most separating parents conflate. The family court divides your assets and may order spousal maintenance. The Child Maintenance Service (CMS) calculates what the non-resident parent pays toward the children's living costs. Getting the boundary wrong between these two systems can cost you thousands.

Here is how child maintenance actually works alongside divorce in England and Wales, and where the traps sit.

How the Child Maintenance Service Calculates Payments

The CMS uses a formulaic approach based on the paying parent's gross weekly income, pulled directly from HMRC tax data. There is no judicial discretion — unlike spousal maintenance, the numbers follow a fixed table.

The basic rates for 2025/26 are:

• One child: 12% of gross weekly income
• Two children: 16% of gross weekly income
• Three or more children: 19% of gross weekly income

These percentages reduce if the paying parent has other children living with them, and further reduce based on the number of overnight stays the children spend with the paying parent. If the paying parent earns over £3,000 per week gross, the CMS formula caps at that threshold — for income above £3,000/week, you can apply to the family court for a "top-up" maintenance order.

A CMS application costs £20. Once active, the CMS can collect payments directly from the paying parent's employer through a Collect & Pay arrangement, though this adds a 20% surcharge for the payer and a 4% deduction for the receiver. The cheaper route is Direct Pay, where the CMS calculates the amount but the parents handle transfers privately.

CMS vs Private Family-Based Arrangements

You do not have to use the CMS at all. Many divorcing couples agree child maintenance between themselves — a "family-based arrangement." This is faster, free, and avoids the CMS surcharges.

The risk: a family-based arrangement has no legal enforcement behind it. If the paying parent stops paying, you have to go through the CMS application process from scratch. And a verbal agreement holds no weight whatsoever.

If you do reach a private agreement, documenting the terms in your consent order provides a paper trail, though the family court generally defers to the CMS formula after 12 months regardless of what your consent order says about child maintenance.

The 12-month rule: Under Section 4(10) of the Child Support Act 1991, either parent can apply to the CMS to override any court-ordered or consent-order child maintenance arrangement once 12 months have passed since the order was made. This means your carefully negotiated consent order figure is only binding for one year — after that, the CMS formula takes over if either party requests it.

How Child Maintenance Interacts with Your Financial Settlement

Child maintenance and the capital split are legally separate, but they influence each other in practice. A judge reviewing your consent order under the Section 25 checklist will consider:

• Housing needs of the children: If the primary carer needs the family home to provide stability for the children, the court will weight asset division in their favour, which may mean a 60/40 or even 70/30 split rather than equal division.
• Income available after maintenance: The court assesses whether each parent can meet their reasonable needs after paying or receiving child maintenance. High child maintenance payments reduce the paying parent's available income, which can reduce a spousal maintenance award.
• Offsetting: Some couples agree that one parent keeps a larger share of assets (e.g., the house) in exchange for reduced or nil child maintenance for the first year before CMS jurisdiction kicks in.

This interplay is exactly why your financial settlement should account for child maintenance flows, even though the two systems are legally independent. The England Divorce Financial Split Guide includes worksheets that help you map out the combined impact of asset division, spousal maintenance, and child maintenance on each parent's post-divorce budget.

School Fees and Extras the CMS Does Not Cover

CMS payments cover basic living costs only. They do not cover:

• Private school fees
• University costs
• Extracurricular activities, tutoring, or sports
• Medical or dental expenses beyond NHS provision
• Holiday costs

For these items, you need a separate agreement — either within your consent order (enforceable for 12 months) or a standalone school fees order under Schedule 1 of the Children Act 1989. If your children attend private school, addressing fees explicitly in your financial settlement is essential, because once the CMS takes over after 12 months, the formula pays no attention to school fees.

What Happens If a Parent Stops Paying

If the paying parent defaults on a CMS arrangement, the CMS has enforcement powers that the family court does not:

• Deduction from earnings order: CMS directs the employer to deduct payments at source
• Liability order: Allows CMS to use bailiffs or register the debt against property
• Driving licence removal: CMS can apply to remove the defaulting parent's driving licence
• Passport removal: In extreme cases, CMS can apply to confiscate the defaulting parent's passport

These powers make the CMS a more effective enforcement route than a family court order for child maintenance specifically. For spousal maintenance defaults, the family court has its own enforcement mechanisms (attachment of earnings, charging orders), but child maintenance enforcement is the CMS's domain.

Getting Your Numbers Right Before You Negotiate

Most divorcing parents in England underestimate how much child maintenance shifts the post-divorce financial picture. Running the CMS calculation before you negotiate your asset split lets you see the true monthly cashflow position for each parent — and avoid agreeing a capital division that leaves one parent unable to meet basic housing costs.

The England Divorce Financial Split Guide walks you through the full financial picture: asset division, pension sharing, spousal maintenance, and child maintenance modelling, so you can negotiate from a complete position rather than discovering gaps after your consent order is sealed.

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