Thank you for visiting the CMSAS Limited website. Please note, we are NOT the Child Maintenance Service (CMS). If you need to contact the CMS, the number for an existing case with the CMS is 0800 171 2345 and for a new case is 0800 988 0988 or you can go to their website here: CMSAS Limited consultants are specialists in the Statutory Scheme of child support, as administered by the Child Maintenance Service. We would like to make you aware that we are not the Child Maintenance Service (CMS). We are a private company that provide a chargeable service of support, guidance and advice to both Receiving and Paying Parents, with Child Maintenance issues, assessments, appeals, tribunals and all Child Maintenance matters pertaining to the CMS (Child Maintenance Service) and/or HMCTS (Her Majesty’s Courts and Tribunals Service), including where difficulties develop with the CMS and/or HMCTS.

Information for the Child Maintenance Service (CMS)

For the latest information, please go direct to the Child Maintenance Service website.

Report changes online

Report changes to your circumstances through your online account.

Call the Child Maintenance Service

Child Maintenance Service
Telephone: 0800 171 2345
Welsh language: 0800 232 1979
Relay UK (if you cannot hear or speak on the phone): 18001 then 0800 171 2345
Monday to Friday, 9.30am to 3.30pm
Find out about call charges

British Sign Language (BSL) video relay service

Watch a video to check you can use the service.

Monday to Friday, 9.30am to 3.30pm

There’s a different phone number if you live in Northern Ireland.

Contact the Child Maintenance Service by post

You can also write to the Child Maintenance Service.

Child Maintenance Service (England, Scotland, Wales cases)
Child Maintenance Service 21
Mail Handling Site A
WV98 2BU

Child Maintenance Service (Northern Ireland cases)
Child Maintenance Service 24
Mail Handling Site A
WV98 2BU

If you would like to arrange an initial consultation with us, please click here or select one of the options below.

Initial Consultation

We charge £175 (£210 inc. VAT) for an initial consultation.

Additional Consulting Hours

We charge £150 (£180 inc. VAT) for additional hours.

Young siblings hugging