The federal government developed the Free Application for Federal Student Aid as the tool for calculating all students' aid in a fair way. For the vast majority of students it allows for a reasonable calculation of financial responsibility and aid eligibility. On very rare occasions a student's situation may need to be reviewed more closely for possible adjustment.
In cases where a student is in an abusive family situation, which creates extreme hardship, a dependency override may be considered by the Office of Student Financial Aid. Documented child abuse cases, release into DHS or court custody, or current parental incarceration are some examples of extreme situations that can be considered for an override. Such situations should be documented by two non-family sources and should involve a total abandonment by the parents from all emotional, financial and physical support for the student.
Note that the factors below do not make a student eligible for a dependency override by themselves.
They are essentially a request to shift the responsibility of paying for your education from your parents to the taxpayers. The government's expectation is that parents meet their own responsibility first. If parents choose to not help their children, their choice creates a great burden on the student, but does not justify by itself shifting their obligation to others. If it did, every parent would be wise to choose such an option. So dependency overrides are only approved for extreme cases that involve far more than parent or student choice.