Circular dependency workaround for Formula

Auto_queen , You need to calculate

if other are columns

This Month's Commission Payable =

var _date =  eomonth([Date], -1)

var _value =Sum([YTD Sales Payable]) - Sum([YTD Salary Paid])

return calculate( if(_value>0, _value,0) , Filter(Table, eomonth(Table[Date],0)  =_date))

in case others are measure

calculate([YTD Sales Payable]- [YTD Salary Paid], previousmonth('Date'[Date]) ) //use date table

as columns

YTD Commission Paid =

var _date =  eomonth([Date], -1)

var _value =Sum([YTD Sales Payable]) - Sum([YTD Salary Paid])

return calculate( Sum( if(_value>0, _value,0) ), Filter(Table, eomonth(Table[Date],0)  <=_date))

Hi Auto_queen 
Please refer to attched sample file. Your actual case might be littele different depending in your real data and data model.