Defunding the IRS is nothing but an effort to reduce tax enforcement. People that have relatively straightforward finances can be trivially audited in a formulaic way with data that's on hand - a lack of human auditing resources tends to benefit those with more complex finances which also tend to be the people with a lot of money who can afford to lobby for less enforcement funding. Also for reference, in 2024 the IR…
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The very first things you list aren't related to the IRS at all. They're local and state taxes, and to get rid of those would require a radical rewriting of the Constitution itself. Not to mention it would destroy all fire department, county hospital, school, city park, state park, etc. funding.