It was all covered in my Florida education. For the most part it is just a very small amount of information that people tend to forget it. It also isn’t all taught in one class. (T4 slips are called W2 forms in the U.S. for those questioning). The investing thing is a broad generalization though. I assume because it may get considered an overlap of teaching kids to gamble. Everyone was required to take either micro or macro economics in high school though for us, both of which touched on stock market invement mostly just tied to the idea of a 401k (retirement accounts).

Nutritional labels were covered in science classes multiple times, but we’re touched on in middle school science, and we were all required to take a home ec class for half a year in 7th grade which taught about it as well. Again in physics and chemistry classes.

W2s were covered in our mandatory typing class as a form of data entry, because most people only take the data from boxes off the W2 and enter them into a tax program. Then the tax brackets were taught to us in middle and highschool.

A lot of it to me is that we don’t pay attention in school and forget a lot over time. Nutritional and Tax bracket questions were on both the ACT and SAT. Which are national tests required to get into colleges.