Tools for Child Maintenance Cases
Practical tools to help you understand your position, challenge decisions, and take action. All free, all run in your browser.
Backdated Payments Calculator
Calculate how much child maintenance may be owed from your CMS application date to when payments started. Includes a month-by-month breakdown and links directly to the complaints generator.
Complaints Letter Generator
Generate a formal complaint letter addressed to your MP, the CMS, and the Independent Case Examiner. Automatically finds your MP from your postcode.
Arrears Calculator
Calculate total maintenance arrears with a full month-by-month breakdown. Add partial payments to get the exact shortfall.
Income Change Checker
Find out if the paying parent's new income triggers the 25% threshold for an automatic CMS review and recalculation.
CMS Fee Calculator
Compare exactly what both parents pay and receive under Direct Pay (no fees) versus Collect & Pay (paying parent +20%, receiving parent -4%).
Mandatory Reconsideration Letter
Generate a properly structured letter to challenge a CMS decision. The deadline calculator shows how long you have left. You get one month from the decision date.
Variation Grounds Checker
A short questionnaire that tells you whether you have grounds to apply for a variation, to push the maintenance amount up or down.