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Why is tax being paid on my salary multiple times?
Your wages are an expense to your employer and are therefore 100% tax deductible in the business income.  The company should not be paying tax on that, so your double-tax scenario, as described, isn't really correct. [The phrase "double taxation" with respect to US corporations usually comes into play with dividends.  In that case, however, it's the shareholders (owners) that pay double.  The answer to "why?" in that case can only be "because it's the law."]