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If you use =1-budget/actual with your numbers (120,000 and 204,000) you get -70%.
This is the number you asked for but is it meaningful?
Suppose actual = 50 and budget = 200 (or 50,000 and 200,000) then the formula gives you -300%
But what does this mean?
However, with actual = 50 and budget = 200 , =actual/budget-1 gives -75% tell us we have 75% of the budget left - seem more meaningful to me
With 120,000 and 204,000 it returns -41.2%. I have 41.2% of my budget unspent
And if actual = 500,000 while budget = 200,000 it give +50% -- we have overspent the buget by this amount
best wishes