Q. Could someone confirm that the income limit is the Adjusted Gross Income, and not the Taxable Income.
A. Yes, the income limit for claiming the education credits is the Adjusted Gross Income (AGI).
For most people, their AGI is the MAGI for the education credits. The MAGI includes additions (no subtractions). So, if your AGI disqualifies you, your MAGI won't change that.
