It depends.
The credit is calculated from the qualifying education expenses paid during the year on higher education.
The credit is reduced when your Modified Adjusted Gross Income reaches $160,000 up to $180,000 for married filing jointly and $80,000 up to $90,000 for all other filing statuses.
The maximum credit is $2,500. If the credit brings your taxes to zero, then you can receive a refund up to 40% of any remaining credit up to $1,000.
American Opportunity Credit guidelines from the IRS