Child Maintenance in the UK: A Guide for Separated Parents

When parents separate, one of the first and most important questions is how the children will be provided for day to day. Child maintenance is the regular financial support paid by the parent who does not live with a child most of the time to the parent who does, and it exists to make sure children get the essentials they need regardless of how their parents’ relationship has changed. This guide explains how child maintenance works in the UK, the different ways it can be arranged, and where to turn if things do not go to plan.

It is general information only, not legal advice. Every family’s circumstances are different, and for anything beyond the basics it is worth speaking to a solicitor or an advice charity. Our overview of family law in the UK is a good starting point if you are still getting your bearings.

What child maintenance covers

Child maintenance is meant to contribute towards the everyday costs of raising a child: food, clothing, housing costs and the general expenses of daily life. It is separate from arrangements about who a child lives with and how much time they spend with each parent, although the two often sit side by side in practice. If you have not yet settled the living arrangements, our guide to co-parenting after separation covers how to build a workable routine with your child at the centre of it.

Maintenance is normally paid until a child turns 16, or up to 20 if they stay in full-time education or certain kinds of training. Both parents remain financially responsible for their children even when one parent has little or no contact, because the obligation runs to the child rather than to the other parent.

Option one: a family-based arrangement

Many separated parents sort out child maintenance between themselves without any official service being involved. This is called a family-based arrangement, and it can be as simple as an agreement that a set amount will be paid on a set day each month, or a sharing of specific costs such as school clothes, clubs and childcare.

The advantages are flexibility and privacy: you can tailor the arrangement to your real budgets and change it by agreement as circumstances shift. The weakness is that a purely private arrangement is not legally enforceable in the same way as a formal one. Writing down what you have agreed helps enormously if memories later differ, and drawing up a wider parenting plan at the same time gives both of you a single document covering money, routines and holidays.

Option two: the Child Maintenance Service

If you cannot agree between yourselves, or an informal arrangement keeps breaking down, the Child Maintenance Service (CMS) can step in. The CMS works out how much should be paid, and it offers two ways of managing the payments.

With Direct Pay, the CMS calculates the amount but the paying parent transfers the money directly to the receiving parent. No fees are charged for this, and it suits parents who can cooperate at least at arm’s length. With Collect and Pay, the CMS collects the money from the paying parent and passes it on, which removes the need for any direct contact about money. Fees apply to Collect and Pay for both parents, so it is worth trying Direct Pay first if you safely can.

Either parent can apply to the CMS, and there is a modest application fee in most cases, with exemptions for some applicants such as those who have experienced domestic abuse. Before applying, it helps to understand where you stand legally; our guide to parental rights in the UK explains the responsibilities that sit behind the financial duty.

How the amount of child maintenance is worked out

The CMS bases its calculation mainly on the paying parent’s gross income, which it usually confirms with HM Revenue and Customs. The amount is then adjusted for a number of factors. Nights a child regularly spends with the paying parent reduce the figure, because that parent is covering day-to-day costs during those stays. Other children the paying parent supports, including children in a new household, are also taken into account.

Certain extra costs can be relevant too. For example, where a child has disability-related expenses, or where the paying parent has unusually high travel costs to maintain contact, there is scope within the rules for those circumstances to be considered. Because income is checked annually, the calculation is reviewed each year, and either parent can ask for it to be looked at sooner if income changes significantly.

For family-based arrangements there is no official formula, but many parents use the CMS calculation as a fair benchmark and then adjust it to fit their own situation. Running the official calculator on GOV.UK before you negotiate gives both parents the same starting point and often defuses arguments about what is reasonable.

When circumstances change

Children grow, jobs change and new relationships form, so a child maintenance arrangement that worked at separation may not work three years later. If you have a family-based arrangement, build in a regular review, perhaps every year on a set date, so adjustments feel routine rather than confrontational. If the CMS manages your case, tell them about changes in income, address or the child’s living arrangements promptly, because calculations are usually only updated from when a change is reported.

Disagreements about changes are one of the most common reasons parents end up in conflict. Keeping communication factual and in writing where possible, and revisiting your wider arrangements with fresh eyes, can stop a money question turning into a general breakdown. If you are struggling to afford advice, our guide to finding free legal advice points to the clinics, charities and schemes that can help at low or no cost.

If a parent will not pay

When a paying parent falls behind under a CMS arrangement, the service has enforcement powers. These can include taking payments directly from earnings, collecting from bank accounts, and ultimately court-backed measures such as seizing goods, placing charges on property or, in persistent cases, disqualifying the parent from driving or holding a passport. Enforcement tends to escalate gradually, so early engagement almost always produces a better outcome than silence.

If your arrangement is informal and payments simply stop, your main option is to move to the CMS so that future maintenance at least is calculated and enforceable. Courts can also make orders in some specific situations, such as for school fees or for children with disabilities, and a solicitor can advise whether that route fits your case.

Keeping child maintenance in perspective

Money after separation carries emotional weight, and it is easy for child maintenance to become the battleground for every other hurt. Children do best when the financial arrangements are treated as practical and boring: agreed, predictable and kept separate from questions about contact and affection. Whether you arrange things yourselves or use the CMS, the goal is the same, a stable contribution that lets your child get on with being a child. Sort the maintenance calmly and consistently, and you remove one of the biggest sources of ongoing conflict from your family’s new shape.