Both salary and commissions are taxable income. You report them on your tax return and your taxable income (after deductions and exemptions) are taxed according to your filing status and your tax bracket. So the short answer is that salary and commissions are taxed at the same rate.
However, if your commissions are paid without federal tax withholding and social security & Medicare deductions and then reported on form 1099-MISC, you will be worse off as you will be subject to self-employment tax at 15.3% (which is the equivalent of both the employee's and employer's shares of Social security and Medicare tax.
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