When a child is placed in foster care, the cost of caring for them is paid to the foster carer in the form of an age-related fostering allowance. This will be calculated by each fostering service. It should also reflect the national minimum allowance calculated on the basis of the minimum amount that any foster carer needs to meet the cost of caring for a foster child.
More details on the national minimum allowance for fostering, introduced by the Department for Education, can be found here.