Taxes is a combination of a 3rd grade reading level and 3rd grade arithmetic. It literally directs you where to get the values for each box and the most complicated math you have to do is basic addition, subtraction, or multiplication.

Teaching a person how to fill out a 1040 is a complete waste of time especially considering they likely won’t need to fill one out for several years and teaching people all the obscure possible forms is pointless as the tax code changes and it’s only applicable to a small fraction of the class and likely not for 5+ years