Among the ideas being floated is a head tax of up to $450 for each employee of businesses generating more than $10 million annually in gross revenue. This would mean Expedia, for example, would incur an additional $2.7 million each year in taxes when it moves to the former Amgen campus near Magnolia. It would mean an additional $20 million a year to Amazon. Smaller businesses might pay a flat fee of $200 to $500 a year, under the ideas being studied.