need help on dax calculations

[PBX_user]

I have 2 table as below and wanted the result after subtracting the count and want to show in visual but this is not showing me the correct result, how I can do it using DAX, basically I am trying to subtract the count , Table1.Count - Table2.Count  and want to achieve result month wise.

Table1

Category	Month	Count
Cat1	Jul-23	1
Cat1	Oct-23	7
Cat1	Nov-23	14
Cat1	Dec-23	29
Cat1	Jan-24	72
Cat1	Feb-24	132
Cat1	Mar-24	177
Cat1	Apr-24	216
Cat1	May-24	268
Cat1	Jun-24	305
Cat1	Jul-24	330
Cat1	Aug-24	360
Cat1	Sep-24	388

Table2

Category	Month	Count
Cat2	Oct-23	1
Cat2	Nov-23	2
Cat2	Jan-24	16
Cat2	Feb-24	36
Cat2	Mar-24	96
Cat2	Apr-24	125
Cat2	May-24	168
Cat2	Jun-24	201
Cat2	Jul-24	242
Cat2	Aug-24	299
Cat2	Sep-24	334

Result

Month	Count
Jul-23	1
Oct-23	6
Nov-23	12
Dec-23	29
Jan-24	56
Feb-24	96
Mar-24	81
Apr-24	91
May-24	100
Jun-24	104
Jul-24	88
Aug-24	61
Sep-24	54

[PhilipTreacy · Accepted solution]

@PBX_user 

Download my PBIX fiel with the data and example shown below

Create a Date Table and mark it as a date table then create a relationship between it and your 2 other tables.

Create this measure

Measure = SUM(Table1[Count]) - SUM(Table2[Count])

and display it in a table

Note that I've formatted the date column to display just the Month-Year

Regards

Phil