This thesis aims to examine the differences in interpretation and application of the new legislation regarding the standardized parental deduction within the Social Insurance Code and the Act Concerning Support and Service for Persons with Certain Functional Impairments. The primary focus is on the differing perspectives of the Swedish Social Insurance Inspectorate (ISF) and the Swedish Social Insurance Agency (F?rs?kringskassan). ISF emphasizes the importance of referencing legislative preparatory works in interpreting the law and has criticized F?rs?kringskassan for failing to do so in its administrative practices.