Receiving a notification from the Child Maintenance Service (CMS) can be unsettling, even when you believe your childcare arrangements are fair and balanced. Many parents feel anxious when a former partner makes a CMS claim, particularly if care has been shared equally and the claim feels unexpected or unjustified.
This guidance explains how CMS looks at shared care, what evidence matters, and what reassurance you can take from the rules around reassessment and backdating.
Understanding the issue or context
CMS claims often arise after changes in relationships, finances, or communication between parents. Even where parents have been sharing care equally for some time, one parent can still make a CMS application.
This does not automatically mean that maintenance will be payable. However, the process itself can feel stressful, especially if you are worried about arrears, backdating, or being treated unfairly.
The key is understanding how CMS assesses care arrangements in practice, rather than assuming the claim itself means something has gone wrong.
The legal rules or framework
Under UK law, CMS calculations are primarily based on two things:
- The paying parent’s income
- The number of overnight stays the child has with each parent
Where care is shared equally — meaning the child spends the same number of nights with each parent — CMS will usually assess that no child maintenance is payable.
However, CMS relies on evidence. If there is disagreement about whether care is truly equal, CMS may initially make an assessment based on the information available, which can later be reviewed.
It is also important to understand backdating. Any maintenance assessed, including arrears, can normally only be backdated to the date the CMS application was made, not to periods before that.
Practical steps to take
If you are dealing with a CMS claim and believe care is shared equally, the following steps can help you respond calmly and effectively.
- Review the care arrangement carefully
Consider the actual number of overnight stays, not just informal understandings. - Gather evidence of shared care
This might include calendars, messages, school records, or agreed schedules showing equal care. - Respond clearly to CMS
Provide accurate information and supporting evidence to request a reassessment if needed. - Check for any deviations
Be aware that occasional changes or temporary arrangements may be taken into account. - Clarify the issue of backdating
If arrears are mentioned, confirm that they are only calculated from the claim date.
These steps help ensure the assessment reflects the reality of your situation.
Common pitfalls to avoid
Parents sometimes make assumptions that increase stress unnecessarily.
- Assuming a CMS claim automatically means payments are due
- Overlooking small deviations in care arrangements
- Failing to provide evidence when requested
- Worrying about backdated arrears beyond the claim date
Staying focused on facts and evidence usually brings clarity.
Frequently Asked Questions
Does equal shared care mean no maintenance is payable?
Usually yes, if care is genuinely equal and supported by evidence.
Can CMS reassess a decision?
Yes. CMS can reassess if new or clearer information is provided.
What if care is almost equal but not exactly?
CMS may adjust calculations based on the number of overnight stays.
Can maintenance be backdated to before the claim?
No. It is normally only backdated to the date the CMS claim was made.
What if my ex-partner disputes the shared care?
CMS will look at evidence from both sides before reaching a decision.
When should I seek legal advice?
If the situation feels complex or you want reassurance before responding, fixed-fee solicitor guidance can help clarify your position.
Conclusion
If you’d like to understand your rights and options in plain English, visit LegalGuidance.org — a free resource powered by Martin Taggart Legal Consulting.
For professional, fixed-fee advice from a UK solicitor, visit MartinTaggart.com.
This information is general guidance only and not legal advice. For personalised support, please contact Martin Taggart Legal Consulting.