According to the rules and regulations of the city of Stockholm
(http://www.stockholm.se/ForskolaSkola/forskola/Avgifter/) Your childcare fee is based on the total income of your household (where the child is registered) and on the number of children in the household who have a place in a preschool or a registered child-minding home in Stockholm.
You start paying fees from the date the place becomes available. If the child’s starts in the middle of the month you do not pay for the entire month. You pay for 12 months a year. View information about fee-based income on stockholm.se.