And a 30% sales tax is a recipe for a barter economy.
Let's stick to your thread topic and OP, which I found to be a workable beginning.
From that, I feel the below might begin to accomplish some of what I found reasonable in your OP.
1. Eliminate the employer contribution to FICA tax along with a mandatory 9% hourly wage increase to only those non-salaried employees.
2. A minimum Federal income tax of 15.3% would be applied, greater only by employee request.
3. Each individual with income from any/all sources equal to or greater than $1,000 would be required to file a tax return.
4. A 5 tiered progressive Federal tax rate would permanently begin at a 15.3% rate, initially applied to the 1st $50,000 of income.
5. The following 4 tiers would permanently be applied in $50,000 increments of 20%, 25%, 30%, and 37%.
6. The ONLY way government would be allowed to increase/decrease tax revenue would be by a flat percentage increase/decrease applied to the tax owed.
eg.
A 1% tax increase would increase the tax of someone earning $50,000 from $7,650 to $7,727 or $77.
A 1% tax increase would increase the tax of someone earning $200,000 from $45,150 to $45,602 or $452.
A 1% tax increase would increase the tax of someone earning $500,000 from $156,150 to $157,712 or $1,562.
A 1% tax increase would increase the tax of someone earning $5,000,000 from $1,821,150 to $1,839,362 or $18,212
Everyone would be affected equally percentage wise by tax increases/decreases.