There is only one way to do so with a 100% success rate - get another offer and show it to your boss. Even if he says no, you still get the raise :D On the oth

There is only one way to do so with a 100% success rate - get another offer and show it to your boss. Even if he says no, you still get the raise :D On the other hand if the raise you are asking for is above current market rate (which could easily trail behind inflation), you don't really have much options.