Parents who use a Government service to chase their former partners for child maintenance are to lose a percentage of each payment.
From today, if the state manages their maintenance payments - through the Child Maintenance Service's 'Collect & Pay' facility - parents will see 4% deducted from their instalments.
The partner paying the maintenance will have to pay a 20% surcharge.
The introduction of the fee is designed to encourage separated couples to come to their own financial arrangements.
An alternative Child Maintenance Service system, "Direct Pay", can be used to do this for a £20 one-off payment.
The Department of Work and Pensions estimates that 39% of parents within the Child Maintenance System currently use the Direct Pay service.
More top news
An owner says his video shows one of his pet dogs crying and mourning the death of other pet.
New study says migrant voters could have a "decisive" impact in a range of key marginal seats in the forthcoming general election.
Andy Murray will play world number one Novak Djokovic in Sunday's Australian Open final after the Serbian beat Stan Wawrinka in five sets