Final answer:
The major advantage of a flat tax type of income tax is its simplicity, as everyone pays the same tax rate regardless of their income level.
Step-by-step explanation:
A flat tax type of income tax has a major advantage of simplicity. This means that everyone pays the same tax rate regardless of their income level. It eliminates the complexity of tax brackets and deductions, making the tax system easier to understand and administer. For example, if the flat tax rate is 10%, someone with an income of $50,000 would pay $5,000 in taxes, while someone with an income of $100,000 would pay $10,000 in taxes.