[Truth]

Probably lower for lower earners. Something like 5% for under $30,000, then 7% up to $100,000, the 10% up to $250,000, then 15% above that.
You would also have to lower the corporate tax rate but make it flat as well but no more than 20% and cut all deductions/government subsidies

The flat tax has merit. However, your flat tax isn't particularly flat. It is a progressive tax just as is the income tax.

I would prefer a true flat tax with the same rate applying to everyone. The "haves" still pay more than do the "have nots". In addition, I would add a federal sales tax of 1 or 2 percent. That would be a consumption tax on those who consume goods. The latter would also apply to most services other than true medical bills (no botox or enhancement exemptions).