DAX measure with month variable based on a date field

I am having a hard time getting the following measure to work. I am trying to change the target based on a date filter. My filter is the Workday columns, where Workday is a standard date column. sMonth is a month columns formatted as whole number. I am looking to keep the slicer granular, in order to work by day, adding custom columns with month and year and basing the measure on those would help. This is what I have tried and couldn't get it to work:

Cars Inspected = 
VAR
selectedMonth = MONTH(SELECTEDVALUE('All Cars Inspected'[Workday]))
RETURN CALCULATE(SUM(Targets[Target]),
    FILTER(Targets,Targets[Location]="Texas"),
    FILTER(Targets,Targets[Description]="CarsInspected"),
    FILTER(Targets,Targets[sMonth]=selectedMonth))

 would appreciate if someone would suggest a different way of achieving the same result or what do I need to tweak. 

Thank you,

C