A tax increase would primarily affect net income rather than gross income. Here's how it works:
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Gross Income: This is the total income earned before any deductions, including taxes. A tax increase does not change the amount of gross income you earn.
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Net Income: This is the income remaining after all deductions, including taxes, have been taken out. A tax increase would reduce the amount of net income because you would be paying more in taxes.
Therefore, the correct interpretation would be: "A tax increase would decrease net income while having no effect on gross income."