Showing percentage calculation using multiple columns

I have to calculate a percentage amount based on data from three different tables. I have used this formula:

"divide(sum('Actual Expense'[Expense Amount])+sum('Forecast Expense'[Forecast Amount]),sum('Initiative Funding'[Amount]))"

and converted the outcome to a percentage.

The problem is this gives me an amount like 105% or 97%, instead of 5% or -3% that I want to show.

In excel, I would simply subtract 1 from the result of the formula, so I tried:

"divide(sum('Actual Expense'[Expense Amount])+sum('Forecast Expense'[Forecast Amount]),sum('Initiative Funding'[Amount])-value(1))" and while it worked for the lines I wanted, it also subtracted 1 from all the other data. See example below:

This pattern is repeated for the other six projects in the data.

What is wrong with my formula?

Steve