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I believe that at this level we would need to account for formal charge as we draw Lewis Structures, as formal charge allows us to determine which Lewis structure is the most correct one.
I don't think you would have to calculate formal charge all the time, I think it would just be when it is being asked for in a problem. Another instance where you most likely will have to calculate it might be when you have to adjust the lewis structure so that all the atoms are stable at a formal charge of 0. Even with that, I think if we are given a problem, it would be stated clearly if they want us to find the formal charge of something.
It would take a lot of time to do formal charge for each lewis structures. It would be best to do them when there are two or more possible structures for one molecule, and you do not know which one is the most favorable one.
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