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.
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. Includes deadline calculator - you have 1 month from the decision date.
Variation Grounds Checker
Answer a short questionnaire to find out whether you have grounds to apply for a variation - to increase or decrease the maintenance amount.