You’ve likely seen it both ways: the word “too” with or without a comma before it. That’s because the rules on this one are a bit loose and based on the writer’s intent.
However, if you are using “too” in the middle of a sentence, commas usually are needed for emphasis.
Example: She, too, wanted to get back to normal as soon as possible.
At the end of a sentence, a comma before “too” is almost never needed, but it’s not incorrect if you decide to use it.
Executives need coaching too.
Executives need coaching, too.