Kraft Mac and Cheese is safe to eat after the expiration date for a year or more after expiration date of the Kraft Mac and Cheese.
The expiration date on the Kraft Mac and Cheese is a general guideline as to the freshness of the Kraft Mac and Cheese and does not mean that the Kraft Mac and Cheese is no longer safe or good to eat.
When the Kraft Mac and Cheese expiration date comes and goes then it just means that the Kraft Mac and Cheese is not as fresh as it would be.
Still it's safe to eat and usually you won't notice much change in the quality or taste of the Kraft Mac and Cheese after expiration date.
The cheese package with the cheese that comes in the Kraft Mac and Cheese may not be as good but it's also still safe to eat.
I go to a store that sells expired food that is still good and buy Kraft Mac and Cheese that is expired for 6 months and it's still safe to eat and I get the boxes of Kraft Mac and Cheese for 25 cents a box so it's very cheap and saves me money.