Why I have $558 of American Opportunity Credit if not $2500? How is this amount calculated?

[JotikaT2]

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