Final answer:
The federal gift tax in the given example is regressive.
Step-by-step explanation:
A regressive tax is one where those with high income pay a lower share of income in taxes than those with lower incomes. In the case of the federal gift tax in the provided example, the tax rate is 10% for amounts up to $100,000 and 20% for anything over that amount.
Since the tax rate remains the same regardless of income level, this tax would be considered regressive.