From the college board:
Students who did not use an SAT fee waiver may still qualify for a PROFILE fee waiver based on their income level. After entering their financial data students find out if they are eligible for fee waivers.
CSS/Financial Aid PROFILE®
Domestic, first-year students who are orphans and wards of the court and under the age of 24 are automatically eligible for fee waivers. Final eligibility for most students will be determined by family income as reported on the PROFILE® application