payroll formulas

SUGGESTED

I have searched this forum for what I think would be a common payroll formula.  I can't find it.  Is there a list of commonly used payroll formulas anywhere?

Basically I need to deduct $111.00 from the net pay of an employee.  I've tried to write my own formula:

ANSWER = GROSS+FED_INCOME+SOC_SEC+MEDICARE+St_income-111.00;

I get an error message "Equal sign (=) expected"

I'm at a loss.  There is an equal sign in the formula.