If someone makes 90000 dollars year how much would they get back in their tax return?

That would depend entirely on how much was withheld from their paycheck. The income tax in the U.S. is a progressive tax based system, meaning, the more you make, the more taxes you owe. This does not include the reduction in income for tax purposes that "tax deductions" offer, such as deductions for home mortgage interest, gifts to charities, etc., nor does it include tax credits.

Currently, someone making $90,000 per year is in the 35% tax bracket.