As a mathematician, I want to see this modified slightly (I will pair the original with my modification)
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Income up to $50k is untaxed
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Income up to $100k is untaxed (I have done the math, this would actually work with one of my other modifications)
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VAT tax for luxury items
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VAT for B2B sales based on the Value Added by their step in the production chain
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Remove sales tax
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Remove tax brackets - replace with a continuous function that has parameters to encapsulate the current credits and deductions, as well as new ones to encourage reasonable behaviors (green energy, having kids, not having kids, etc.)
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Addendum to the above: business taxes fall get the same treatment, with parameters for things like the wealth/income gap ratio between the highest-paid employee and the median for the company, % of employees who reside in the United States, number of subsidiaries, number of technology acquisitions made. Oh, and companies that make more than $1M/yr never get a refund, period.
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Require communities to cap rent, it is done by popular vote as a ballot measure, and the options are calculated based on local needs, cost of living, and median income for the town.
I have more, but I also have a headache.