I can't see business owners supporting a flat tax with no deductions
If you take in 1,000,000 in one year but after paying payroll, cost of goods, etc. you are left with $100,000 profit for your own income....you'd pay (at a 30% flat tax rate) tax on the 1,000,000...which would be $300,000. Instead of the current 28% on $100,000, which is $28,000.
A flat tax with no deductions
would not apply to business owner's gross
income (profit) and gross sales. The Flat tax scenario applies to
individual income taxes thus not to business "expenses" which go to Schedule C 1040 and are subtracted from gross sales or gross income which becomes adjusted gross income which finally goes to form 1040 for individual application of the income tax. But this misconception will be attempted to be applied by those who see
profit as an evil, and is telling of the
perception of fairness which is not and can not be a part of the formula of taxation applied to individuals vis-Ã -vis business.
They are like apples versus oranges for comparison.

Are you saying you see personal income tax as fair and all other taxes as evil?
Not at all, I am suggesting that some people believe any and all profits are seen as being evil though. Please read again the words bolded above.
If you are advocating that nothing but salary income is taxed I don't think you'll get very far with it. I've never seen a coherent flat tax plan that doesn't heavily favor everyone except those that actually receive a salary.
Let me try to put this in perspective without getting into a lot of definitions about
wages, salaries, profits, income, etc. There are costs of doing business that are not income so have to be subtracted from the gross to arrive at the income or profit. Those costs (and some standard items like IRAs and Keogh plans) have to be subtracted from the gross "income" to arrive at the Adjusted Gross Income which is equivalent to all those bolded above.
As an easy to understand example take the construction of a house: The costs of land, building materials, subcontracted labor (along with equipment provided), in house labor, professional services, permits, fees, etc are hard costs and expenses and are not "deductions" as are finally applied to peronal/individual income taxes. The builder is left with about 7 to 10 percent which is profit; let's say 8.5%. If the builder was not able to deduct all those costs he or she would pay taxes on the gross sales. Lets compare:
As it stands now a $200,000. home will yield perhaps $17,000 in net profit or Adjusted Gross Income (AGI is arrived at after IRAs and some pension plans are subtracted from net profit) That is what our builder pays individual income taxes on, and that is what the flat tax is intended to apply to. Lets say as it now stands, Fica (15%) and Income tax (28%), now total about 43% so he sends to the IRS about $7,300;
that is the actual case now. Of course the builder builds several homes per year, but at some point he becomes less personally involved in each unit and loses some control thus his percentage of profit suffers, along whith the quality of his work, and his reputation.
Say there was a flat tax of 15%, and still a FICA TAX of 15% and then that was paid against the gross sale; then the tax would be $30,000. But competition and moderated demand for the product still forces a profit of about 7-10% for the builder. As you can see, in that case the taxes would exceed the income by a factor of four.
I've never even seen a real flat tax plan, most seem to be a progressive tax with one allowable standard deduction.
Here's a problem that so many of us have. If we all had to immerse ourselves in the tax system we would begin to see it more clearly. Most people don't have a clue as to how the whole system works. For most that will only happen when they are in a position in which understanding it becomes vital for their financial survival, and that is definitely the case with the small business person.
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