Receiving a payment claim from the Child Maintenance Service (CMS) can feel unsettling, particularly if you believe the amount does not reflect your actual childcare arrangements. Many parents are unsure whether a CMS assessment can be changed, paused, or effectively reduced where care is shared equally.
This guidance explains, in clear and calm terms, how CMS assessments work under UK law, when a payment claim may be adjusted, and what practical steps can help you present your position clearly.
Understanding the Issue or Context
CMS calculates child maintenance based on income and the number of nights children stay with each parent. Difficulties often arise where parents have a genuine 50/50 shared care arrangement, but the initial CMS assessment does not reflect this.
Parents sometimes refer to “nullifying” a CMS payment. In practice, CMS does not usually cancel an assessment entirely unless there is no qualifying child or no jurisdiction. However, where care is genuinely shared equally, the assessed amount may be reduced significantly, and in some cases to nil.
The key issue is evidence. CMS decisions are driven by documented proof of care arrangements rather than informal understandings.
The Legal Rules or Framework
Under UK child maintenance rules, the Child Maintenance Service considers the number of overnight stays each child has with the paying parent over a 12-month period.
Where care is shared:
- CMS applies reductions based on bands of overnight stays.
- If care is exactly equal, the maintenance calculation can be reduced substantially.
- In limited situations, equal shared care combined with similar incomes may result in no payment being due.
CMS will not usually accept verbal assurances alone. The assessment is evidence-based, and the burden is on the parent challenging the calculation to demonstrate the care pattern.
Practical Steps to Take
If you receive a CMS claim and believe payment should be reduced or removed due to 50/50 shared care, the following steps can help clarify your position:
- Request the calculation details
Ask CMS to explain how the assessment was calculated, including the care assumptions used. - Gather clear evidence of shared care
This may include a calendar showing overnight stays, school records, care schedules, or written parenting agreements. - Submit a change of circumstances request
Provide your evidence and ask CMS to reassess the calculation based on equal care. - Keep records up to date
Ensure your evidence reflects a consistent pattern over time, not just short periods. - Ask for written confirmation
Request confirmation of any reassessment or decision in writing.
These steps help ensure CMS has the information needed to reach an accurate outcome.
Common Pitfalls to Avoid
Parents often encounter problems by:
- Assuming CMS will accept informal arrangements without proof
- Providing incomplete or inconsistent records
- Using the term “nullify” rather than focusing on reassessment
- Delaying action after receiving the initial calculation
Avoiding these pitfalls can make the process clearer and less stressful.
Frequently Asked Questions
Can CMS cancel a payment entirely?
Usually only in limited circumstances. More commonly, payments are reduced based on care levels.
What evidence does CMS accept for shared care?
Calendars, care records, school information, and written agreements can all be relevant.
Does shared care have to be exactly 50/50?
No. CMS applies reductions across set bands of overnight stays.
What if the other parent disputes my evidence?
CMS will review information from both sides before making a decision.
Can CMS backdate a revised assessment?
In some cases, changes can be applied from the date CMS was notified.
When should I seek legal guidance?
If the assessment feels unclear or evidence requirements are confusing, fixed-fee advice can help provide certainty.
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.