I see this become apparent on social media every so often and it's really just depressing how widespread the misunderstanding is.
51% of Americans who were polled in a 2021 survey agreed with the statement that "You pay your marginal tax rate on all of your income".
I fully understand that aptitude tests as a requirement for voting are wildly undemocratic, but if we had one that was exactly one question long and that question was to demonstrate you understand how tax brackets work, I would be for it.