PoliBoard: Teach me why a flat tax is bad.

Here is my argument FOR. Looking for real responses. Not a troll thread this time.

I am going to use basic numbers to push my idea. The number of citizens in the United States is roughly 321 million. Let's say that the average income per citizen is 60k/yr (the poor and children are offset by the million/billionaires). This leave a generated revenue stream of 19.2Tr dollars. At a ten percent flat tax, this would leave an individual income tax revenue of 1.92Tr dollars.

Here is a graphical breakdown of FY2015 where the federal budget cost 3.8Tr.



The three biggest expenditures are: SS/Unemployement (1.275Tr), Healthcare (1.051Tr), and Military (600B).

The next graph is a breakdown of Federal Tax revenue by source for FY2015:



As you can see the debate lies in the 47% bucket (individual income tax). The other bucket includes FICA (33%) and CIT/other taxes for the other 20%.

Assuming we keep FICA and CIT/other taxes the same, we just need to figure out the difference in revenue from our current system to the one presented forth.

"The largest share of fiscal 2015's record-setting tax haul came from the individual income tax. That yielded the Treasury $1,540,802,000,000"

$3,248,723,000,000: Federal Taxes Set Record in FY 2015; $21,833 Per Worker; Feds Still Run $438.9B Deficit

As you can see the individual income tax collected in FY2015 was 1.54Tr dollars.

If the provided numbers at the beginning of the post were indeed to be proven true, then 1.92Tr dollars is greater than 1.54Tr dollars any day of the week.

What actually happens is that the government does not need to reduce anything. In fact, we have a 380B surplus we can use to either pay down debt or increase monies paid out to any of the buckets in our federal budget.

This is how I came to the thought that flat tax IS possible. Any opinions are appreciated.

Edit: I also figured a revenue @ median income level of 53k per person. This would gain 1.7Tr in individual taxes. Still higher than the 1.54Tr in today's economy.

Edit #2: I would like to figure out total money paid in payroll for 2015, but can't seem to find that information. It would help prove the initial numbers I presented.