Cumulate Remainer formula help needed

[CMSGuy]

I think this is pretty simple but I need help with a cumulative remainder total.  The table has a column, T1N which is total needed, then T1S is total submitted, then T1R is remainder.  This view is by Month right now but should be able to be drilled up to Quarter, then Year, or down by date.  The formula I have for T1R is currently this, which I am sure is not correct: 

T1R = 'Daily Certification Full'[T1N] - 'Daily Certification Full'[T1S]

Thanks for any help you can give

EDIT

This is from excel, but something I am looking for:

Month	Needed	Recorded	Remaining
May	60	4	56
June	56	18	38
July	38	2	36
August	36	0	36
Total		24

[daXtreme · Accepted solution]

@CMSGuy 

Are these Txx measures or columns from the base table? If they are measures, then I guess it's enough to turn them into: T1N = SUM( T[RelevantColumn] ). Same for T1S and then T1R will be the diff of the measures.

[CMSGuy]

They are coming from the base table.  Should they be measures?