Here in FL sales tax is 7.5%. Payroll tax at present takes another 5.65%.
So any employed person here is paying over 13.15% in taxes, no matter how little they make. Much more in reality, of course.
To be fair, much of this is offset by the reverse income tax payments.
You can't add sales tax in because a large portion of money spent may not be charged sales taxes. Items like rent, mortgages, interest, utilities, and food and labor in most states, are not charged.
So any employed person here is paying over 13.15% in taxes, no matter how little they make. Much more in reality, of course.
There is a problem with your math. No one spends 100% of their income on taxable expenses. Most states do not charge sales tax on the biggest expenditures - food, housing, transportation, services, etc. So to get a realistic figure, you would have to estimate what percentage of their income they spend on taxable items. So if they spend 20% of their income on taxable items, the calculation would be 5.65% (FICA) + (20%*7.5%) = 5.65%+1.5% = 7.15%.
Actually, FL sales tax is 6.0%. The rest is local. Where I live it’s a county tax of 1.0% (applied only up to the first $5,000 of a transaction).