Target vs actuals month basis

[FoolzRailer]

Hello 

I'm trying to do some visuals for some projects I'm working on, where I have a Target for the project which is static, and a monthly update of what has been invoiced. 

So far I've added the data to PowerBI, created a date table and linked the projectnumbers with relations. 

What I would like to do is see how much of the TargetBudget has Invoiced used on a montly basis. My issue is I can't really figure out how do I calculate the remaining budget based on what has been invoiced?

What I'm aiming at/near, when I'm finished is something similar to this Dashboard layout:

[amitchandak · Accepted solution]

@FoolzRailer , Make sure both table are joined to common project table. No need to join target to date table

remaining example 

sumx(project, calculate(Sum(Invoice[Amount]) - Sum(Target[Amount]) ) )

or

sumx(values(project[project]) , calculate(Sum(Invoice[Amount]) - Sum(Target[Amount]) ) )