The Constitution neither prohibits income taxation nor does it require it. The Congress has the power to change the laws and tax structure.
The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts
Article 1 Section 8.
If you do not like the law, try to have the law changed. I am not saying that I like taxes, but they are a fact of life.
How could you get rid of the income tax?
To get rid of the income tax you first need to either get rid of enough spending or increase other taxes to replace it. In 2007, the Federal Government took in $1.16 trillion in income taxes. That does not include Social Security taxes. Spending (not including Social Security) was about $2.2 trillion. Corporate income taxes came to $370 billion. Other sources including excise taxes only amounted to roughly $165 billion.
http://en.wikipedia.org/wiki/United_States_federal_budget,_2007 So leaving out Social Security taxes and income taxes, you have about $535 billion to pay for a $2.2 trillion budget.
About $250 billion went to pay interest on the Federal Debt. If you want to get rid of that, you need to cut other programs or raise enough taxes to pay off the over $9 trillion owed there. That is on top of any cuts to balance the budget in the first place.
Defense alone was $548 billion last year- and the costs of the wars in Iraq and Afghanistan are not included in the budget figures since they were paid for via supplemental spending bills. That is to balance the budget without income taxes. We haven't touched the debt and reduced the interest payments yet.
If you decide to tax profits, then the companies will pass that on to consumers in the form of higher prices so the consumer ends up paying anyways. You don't really help yourself by doing that. What you do need to do is reduce the spending side. But getting Congress to cut anything is incredibly hard. If you make cuts, you are taking away money that goes to someone who may vote for you so as a rep you don't want that.
If you toss in Social Security the numbers are a bit better. Revenues are up to $1.4 trillion and expenditures are $2.8 trillion- or a shortfall of $1.4 trillion instead of $1.7 trillion.
And you still have $879 billion in Social Security taxes you are paying. And Medicare taxes. Plus state taxes.
Getting rid of it in theory sounds nice, but in reality, what do you do? How do you achieve the goal?
Here is what you have to pick from for your $1.4 trillion in cuts:
$586.1 billion (+7.0%) - Social Security
$548.8 billion (+9.0%) - Defense[2]
$394.5 billion (+12.4%) - Medicare
$294.0 billion (+2.0%) - Unemployment and welfare
$276.4 billion (+2.9%) - Medicaid and other health related
$89.9 billion (+1.3%) - Education and training
$76.9 billion (+8.1%) - Transportation
$72.6 billion (+5.8%) - Veterans' benefits
$43.5 billion (+9.2%) - Administration of justice
$33.1 billion (+5.7%) - Natural resources and environment
$32.5 billion (+15.4%) - Foreign affairs
$27.0 billion (+3.7%) - Agriculture
$26.8 billion (+28.7%) - Community and regional development
$25.0 billion (+4.0%) - Science and technology
$23.5 billion (+0.8%) - Energy
$20.1 billion (+11.4%) - General government
Medicare and Social Security are presently funded via their own taxes.
I removed the interest on the debt from this list since you cannot get rid of that until you pay off the $9 trillion+ debt.
Or what taxes do you increase:
$869.6 billion - Social Security and other payroll taxes
$370.2 billion - Corporate income tax
$65.1 billion - Excise taxes
$26.0 billion - Customs duties
$26.0 billion - Estate and gift taxes
$47.2 billion - Other