Reporting Income if you don't qualify for fee waiver

Colleges and Universities A-Z University of California - GENERAL
1

Is it really mandatory to report last year’s income on the application if you know you won’t qualify for a fee waiver?

2

No, you do not need to report your family income on the UC application.

From the UC application website:

[quote]
Parental Info, Education, Family Size and Income – optional but helpful when provided