Applying for child maintenance is often one of the most practical steps separated parents can take to provide stability for their child. In the UK, child maintenance is money paid by one parent to the other (or, in some cases, to a person with day-to-day care) to help cover the child’s everyday living costs. It is not about rewarding or punishing either parent. It is about meeting a child’s needs in a predictable way, even when family arrangements have changed.
Many people find the process daunting because emotions can run high, communication may be difficult, and there can be confusion about what is legally required. It can also be hard to know where to start: whether to agree payments privately, apply through the Child Maintenance Service (CMS), or ask a court to deal with finances. Timing matters too. Delays or unclear arrangements can lead to arrears building up, disagreements about what has been paid, and avoidable stress.
This guide explains how child maintenance works in the UK and sets out a step-by-step approach to choosing the right route, gathering the information you will need, estimating likely payments, and applying to the CMS where appropriate. It also covers how cases are managed over time, including changing circumstances, missed payments, and enforcement, so you can understand not just how to start, but how to keep arrangements working in the long term.
Understanding child maintenance in the UK
Child maintenance is designed to contribute to a child’s day-to-day living costs such as food, clothing, housing, and routine expenses. It is separate from child-related one-off costs parents may agree between themselves, for example school trips, clubs, or uniform. It is also different from spousal maintenance, which is financial support for an ex-partner if they were married.
In most situations, the Child Maintenance Service has jurisdiction in relation to child maintenance for children under 16 (or under 20 if they are in approved education or training). The CMS uses a formula, mainly based on the paying parent’s gross weekly income and how many nights the child stays with them. The aim is to apply a standard approach that is predictable and relatively straightforward.
Child maintenance can be arranged in three main ways in the UK. One option is a family-based arrangement, where parents agree payments privately without involving the CMS. Another is a CMS calculation and case, where payments are set using the CMS rules and managed either privately (Direct Pay) or through CMS collection (Collect and Pay). In more limited circumstances, the courts may deal with child-related financial provision, for example where there are school fees, additional needs, or where the CMS does not have jurisdiction for a particular type of payment. For most routine maintenance, the CMS is the primary route.
It is important to understand that child maintenance is separate from child arrangements. A parent’s responsibility to contribute financially does not depend on whether they see the child. Equally, maintenance should not be used as leverage to control contact. If there are disputes about where the child lives or time spent with each parent, those issues should be handled separately, either directly, through non court dispute resolution such as mediation, or where necessary a court application.
Finally, keeping clear records matters. Whether you agree privately or use the CMS, tracking payments, dates, and any shared costs can reduce misunderstandings and help if circumstances change later.
Working out eligibility and the right route (CMS or agreement)
Before applying, you need to check whether the CMS is the appropriate route and whether you meet the basic conditions. A CMS application usually involves one parent who does not have the main day-to-day care of the child paying the other parent who does. The person with day-to-day care can be a parent or another person the child lives with, such as a grandparent. The CMS can also deal with certain shared care scenarios, but it still needs a clear basis for who is treated as the receiving parent for maintenance purposes.
A family-based arrangement can work well when communication is reasonable and both parents are willing to be transparent. It offers flexibility, avoids fees, and can reflect the child’s actual needs in a way the formula does not. For example, parents might agree that one parent pays a lower monthly amount but covers certain regular costs, or they might adjust informally when working patterns change. The risk is that it depends on continued cooperation. If the paying parent stops paying, the receiving parent may have to start again via the CMS, and any missed payments under a private agreement are not automatically enforceable as CMS arrears.
The CMS route is often suitable where communication has broken down, where payments have been unreliable, or where you want the certainty of a formal calculation. The CMS can set an amount and, if needed, take enforcement action. You can still choose how payments flow. Direct Pay means the CMS calculates the maintenance, but the paying parent transfers it directly to the receiving parent. Collect and Pay means the CMS collects from the paying parent and passes it on, typically used when payments are not being made.
There are also situations where the CMS may not be able to help or may not cover everything. For example, the CMS calculation is not designed to include school fees or large additional expenses. Where there is a need for wider child-related financial provision, legal advice can be useful to explore whether other routes are available and appropriate. Choosing the right route is mainly about balancing reliability, flexibility, and the level of conflict.
Preparing information and calculating likely payments
A smooth application depends on having the right information ready. If you are considering a private agreement, preparation also helps you negotiate from an informed position and avoid unrealistic expectations.
Start with the basics about the child and living arrangements. You will usually need the child’s full name and date of birth, and clarity on who the child lives with most of the time. If care is shared, note the typical pattern of overnight stays. Overnight care matters because the CMS formula applies a reduction based on the number of nights the child stays with the paying parent. It is helpful to record the schedule in a calendar format, especially where the pattern varies during school holidays.
You should also gather details about both parents. For a CMS case, the CMS will look primarily at the paying parent’s gross income, generally obtained through HM Revenue and Customs. Even though the CMS can access income information, you will need identifying details to help the CMS locate the paying parent, such as their full name, address, telephone number if known, and National Insurance number if available.
To estimate likely maintenance, it helps to understand the main elements of the CMS formula. The CMS uses gross weekly income, applies different rates depending on income bands, and adjusts for the number of children being supported. It can also take account of other children living with the paying parent. In addition, shared care reductions apply based on the number of overnight stays. If the paying parent has a very low income, is receiving certain benefits, or has significant variations in income, different rules can apply.
Although the formula is structured, real life can complicate calculations. Self-employed income can fluctuate. A paying parent may have income from dividends or property. There are also situations where a parent believes the other is not declaring all income, or where there are assets that do not show up in earnings. In some cases, you may be able to ask the CMS to look at additional income or consider a variation, but you will need supporting information.
Finally, decide what you want the arrangement to achieve. Maintenance is for everyday costs, but it can be helpful to list the child’s typical monthly expenses, including essentials and regular activities. Even if the CMS amount is lower than you hoped, understanding the full picture can support constructive discussions about sharing extras on top of maintenance.
Making an application and managing a case (payments, enforcement, changes)
If you decide to apply through the CMS, you can make an application online or by phone. You will be asked for details about you, the child, and the other parent. In many cases there is an application fee, though some applicants are exempt. Once the CMS accepts the application, it will contact the other parent and begin the process of calculating maintenance.
After the CMS makes a calculation, you will need to choose a payment method. Direct Pay is often the starting point. The CMS sets the amount and schedule, but you manage the transfer between yourselves. This can be less intrusive and avoids additional collection charges. However, it relies on the paying parent making payments on time. If payments are missed or persistently late, the receiving parent can ask the CMS to move the case to Collect and Pay. Under Collect and Pay, the CMS collects from the paying parent and passes the money on, and additional charges may apply. It is intended for situations where Direct Pay is not working.
Good record-keeping is essential. Keep bank statements, screenshots of transfers, and any written messages about payments or agreements. If a payment is missed, act promptly. In a CMS case, report non-payment and ask what enforcement options are available. Enforcement can include deductions from earnings, deductions from bank accounts, and other measures where appropriate. The CMS has powers, but enforcement can still take time, so early action is usually better than waiting for arrears to build.
Child maintenance arrangements often need to change. Common triggers include a change in income, a change in the number of nights the child stays with each parent, a new child in either household, or a change in work status. The CMS can carry out reviews and reassessments, but you may need to report a change to ensure it is captured. If you believe the calculation is wrong, there are routes to challenge it, including asking for a mandatory reconsideration and, if needed, an appeal. Time limits apply, so do not delay.
If you have a family-based arrangement, it is wise to review it periodically, especially when circumstances shift. Putting the agreement in writing, even informally, and stating the amount, payment date, and method can prevent disputes later. Where communication becomes difficult or payments stop, moving to the CMS can provide a more robust framework.
FAQs
Can we agree child maintenance ourselves without using the CMS?
Yes. A family-based arrangement is often the simplest approach when both parents can communicate and trust each other to stick to what is agreed. You can agree a monthly amount, a weekly amount, or another payment pattern, and you can also agree to share extra costs such as clubs or school-related expenses. The key is clarity and consistency. It usually helps to put the agreement in writing, even if it is just an email confirming the amount, when it will be paid, and how it will be transferred. The main drawback is enforceability. If the paying parent stops paying under a private agreement, you cannot generally force payment of those missed amounts through the CMS as arrears. You may need to open a CMS case to get a formal calculation going forward.
Do I need to have a contact arrangement in place before applying for child maintenance?
No. Child maintenance and contact are separate issues. A parent’s obligation to contribute financially does not depend on whether contact is happening, and contact should not be withheld because maintenance has not been paid. The CMS can calculate maintenance based on the child’s living arrangements, including overnight stays, but it does not require a formal court order about contact. If there is disagreement about how many nights the child stays with the paying parent, that can affect the calculation. In practice, it can help to keep a record of the pattern of care, such as a calendar or written messages confirming arrangements. If contact is disputed or inconsistent, you may need separate support to resolve child arrangements, but you can still apply for maintenance in the meantime.
How long does it take for the CMS to set up a case and make a calculation?
Timescales vary depending on how quickly the CMS can gather information and contact both parents. Straightforward cases can move faster, while cases involving difficulty contacting the other parent, uncertain income details, or disputes about shared care can take longer. Once a calculation is made, it will set out how much should be paid and from what date. It is important to understand that maintenance does not always start immediately when you apply, so budgeting for a short gap can be sensible. If you are concerned about delays, make sure the CMS has accurate details for the other parent and respond promptly to any requests for information. Keeping a record of your application date and CMS correspondence can also be helpful.
What if the paying parent is self-employed or tries to reduce their income?
Self-employed income can be more complex because earnings can vary and are often reported annually. The CMS generally relies on HM Revenue and Customs information, which may not reflect very recent changes. If you believe the paying parent’s income shown in the calculation is inaccurate, or that they have income not captured by the standard figure, you may be able to ask the CMS to look at a variation. Variations can sometimes apply where there is additional unearned income, such as income from property or investments, or where there are concerns about diversion of income. You will usually need to provide as much supporting information as possible. The process can take time and may involve further evidence, so it is worth being organised and realistic about what can be proven.
What happens if maintenance is not paid?
If you have a family-based arrangement and payments stop, your main practical option is usually to open a CMS case so there is a formal calculation and a mechanism to manage payments. If you already have a CMS case on Direct Pay and payments are missed, you can report non-payment and ask about moving to Collect and Pay. Under Collect and Pay, the CMS can take steps to collect money directly, and enforcement options may be used where necessary. Enforcement can include deductions from earnings, which is often effective where the paying parent is employed. There are also powers to pursue arrears through other methods, depending on the circumstances. Keep clear evidence of missed payments and dates, and act early rather than waiting for arrears to grow.
Can child maintenance be changed later if circumstances change?
Yes. Child maintenance should reflect current circumstances as closely as possible. If the paying parent’s income changes, if there is a significant change in shared care nights, or if either parent has other children to support, the amount may need to be reassessed. In a CMS case, you can report changes and the CMS can recalculate. If you think the CMS has made an error, you can ask for a mandatory reconsideration, and if needed, appeal, but there are deadlines so do not delay. For private agreements, it is sensible to review the arrangement periodically and agree how changes will be handled, for example reviewing every 6 or 12 months or when a specific event happens such as a job change.
Conclusion
Child maintenance is one of the clearest ways separated parents can protect a child’s routine and wellbeing. In the UK, you usually have a choice between agreeing maintenance privately or using the Child Maintenance Service to calculate and manage payments. A private agreement can be flexible and cooperative, but it depends on trust and consistency. The CMS route offers structure and enforcement options, which can be essential where communication is difficult or payments are unreliable.
A practical approach is to start by confirming eligibility and identifying the best route for your situation, then gather the key information early, especially details of living arrangements and any shared care pattern. Estimating likely payments helps you set realistic expectations and makes conversations more constructive. If you apply to the CMS, understanding the difference between Direct Pay and Collect and Pay, keeping thorough records, and reporting changes promptly will help the case run more smoothly over time. If problems arise, acting early can prevent arrears and reduce conflict.
If you would like tailored advice on your options, how a CMS calculation may apply to your circumstances, or how to handle a dispute about payments or changes, you can speak with a solicitor. For more information about accessing legal sup
