<p>"Documentation must be provided to verify the financial information requested above. Please check the type of documentation you are or will be sending:
Tax forms
Statement from employer
Other (explain)"</p>
<p>I've been working as freelancer for around a year, and get much of my cash from this work. But I have no permanent employer, and I don't pay any taxes. How to prove my income?</p>
<p>In addition, I've been working as a trainee in the university, but had no constant income or something. Should I indicate it?</p>