Family lawyer explains child support changes
21 May 2014 Last updated at 12:08 BST
Letters are being sent out to thousands of single parents in England, Scotland and Wales this week telling them their child maintenance arrangements are to change.
The letters are encouraging parents to come to amicable arrangements over maintenance for their children or face being charged to do so by the government.
Under the new rules, if an agreement cannot be reached, the paying parent will have a 20% fee added to their maintenance payment and the receiving parent will pay 4% to collect it.
Liz Cowell, Principle Family Lawyer at Slater Gordon, explained the changes to BBC Radio 5 live's Breakfast.