What is a CMS dispute?
A CMS dispute is where a parent challenges a Child Maintenance Service decision before it reaches tribunal stage. Disputes commonly arise due to incorrect calculations, missing or lost paperwork, incorrect arrears figures, incorrect effective dates, or errors caused by system migration between the old CSA system and the newer CMS system.
In many cases, disputes are not about refusing responsibility — they are about accuracy, evidence, and whether CMS records match what actually occurred.
What this guide is for
This guide is designed to help parents who believe a CMS decision is wrong and want to challenge it using their own paperwork, correspondence, and timeline of events. It focuses on helping you organise evidence, understand where errors typically occur, and how to present your position clearly and calmly.
This guide may help if:
- You believe CMS figures do not match previous agreements or decisions
- You were moved from CSA to CMS and records appear incomplete or incorrect
- You are being chased for arrears you do not recognise
- You have letters or evidence that CMS appears not to hold
- You want to dispute a decision before it escalates to tribunal
What this guide is not for
This guide is not suitable for parents seeking to avoid child maintenance obligations, hide income, or ignore lawful decisions. It is also not a replacement for legal advice where complex legal issues arise.
This website does not provide legal advice. Nothing on this website should be interpreted as legal advice, legal representation, or a substitute for advice from a qualified professional.
Why paperwork matters
CMS decisions are heavily dependent on what exists on their system. If correspondence, agreements, or decisions are missing from their records, CMS may proceed as though they never existed.
A key principle throughout this website is simple: If it is not in your possession, it effectively does not exist. Keeping and organising your own records is critical when disputing CMS decisions.
Templates and examples
Any templates, letters, or guidance provided on this website are examples only. They are intended to help parents structure their own communications where legal support is unavailable or unaffordable.
Legal professionals would not normally prepare dispute documents in the way shown here. These materials exist specifically to support parents who are self-representing.
Independence
Child Support Advice is an independent website and is not affiliated with the Child Maintenance Service (CMS), the Department for Work and Pensions (DWP), HM Courts & Tribunals Service, or any government organisation.
By using this website, downloading templates, or purchasing guidance materials, you acknowledge and accept that all content is provided for guidance only.
No solicitor-client relationship is formed by using this website.