For Assistant Controllers, 10 to 20 years of experience on the job amounts to an average salary of $75K. Assistant Controllers who have racked up more than two decades of experience report lower incomes overall; the average sum for this crowd comes out to only $74K.ash earnings for Assistant Controllers — which occasionally include more than $15K from bonuses and more than $10K from profit sharing — stretch from around $44K to approximately $105K.