There are actually two higher-education tax credits. The American Opportunity Tax Credit (AOTC) provides up to $2,500 worth of credit for each student, 40% of which is refundable. The credit is equal to 100% of the first $2,000 of college tuition and qualified expenses and 25% of the next $2,000. The AOTC only applies to the first 4 years of post-secondary education.
The other credit is the Lifetime Learning Credit (LLC), which only provides a maximum $2,000 of credit (20% of up to $10,000 of eligible expenses) per family. None of it is refundable, meaning it can only be used to offset the taxpayer’s tax liability, and any additional credit amount is lost.