What movie does Jim Carrey play in that he can not lie because his son made a wish would be able to for day?

The movie you're thinking of is Liar Liar (1997).

In the movie, Jim Carrey plays Fletcher Reede, a lawyer who is known for lying. His son, Max, wishes for his dad to not be able to lie for a day. The wish comes true, and Fletcher is forced to tell the truth, leading to hilarious consequences.