UK Child Maintenance Calculator
Calculate your child maintenance payments using the official Child Maintenance Service (CMS) formula. Free, instant, and accurate.
Why Use Our Calculator?
100% Accurate
Uses the exact same formula as the Child Maintenance Service. Updated for 2024 rates and thresholds.
Completely Free
Get instant results at no cost. Optional PDF reports available for those who need official documentation.
Private & Secure
Your data is never stored or shared. Calculations happen in your browser. No account required.
How It Works
Enter Income
Your gross annual income and pension contributions
Add Children
Number of children in this arrangement
Shared Care
How many nights the child stays with you
Get Results
Instant calculation with detailed breakdown
Frequently Asked Questions
How accurate is this calculator?
Our calculator uses the exact same formula as the Child Maintenance Service. It accounts for income bands, shared care arrangements, and other children in the household.
Is my data safe?
Yes, all calculations happen locally in your browser. We don't store your personal or financial information.
What's included in the PDF reports?
The Basic Report includes your calculation breakdown and reference ID. The Comprehensive Report adds income scenarios, shared care variations, and 18-year projections.