Write SQL query to solve given problem: What is the highest pay rate of the employees who are exempt from collective bargaining?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.Rate FROM EmployeePayHistory AS T1 INNER JOIN Employee AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID WHERE T2.SalariedFlag = 1 ORDER BY T1.Rate DESC LIMIT 1