Calculate Your Child Maintenance
Free calculator using the official 2026 CMS formula. Answer a few questions to get your estimate.
1
Income2
Children3
Shared CareIncome Details
Enter the paying parent's income and pension contributions.
£
Your gross annual income before tax and National Insurance
£
Only include workplace or personal pension contributions (optional)
What counts as income?
- • Salary, wages, and bonuses
- • Self-employment profits
- • Rental income
- • Investment income (dividends, interest)
- • Most benefits and pensions
Your data is private
All calculations happen in your browser. We don't store or transmit your personal information.