I do hereby solemnly swear that I don't file my federal taxes for fun and personal entertainment, but because you require me to. If you would like to change your mind and stop requiring tax returns from people whose total income is 0, adjusted gross income is 0, and taxes or refunds owed are 0, please do so, it would be most welcome. Until then - please adjust your processing software to be able to process the forms where these values are 0.
Also, please do not ask people to put things in parentheses if your forms don't accept parentheses.
Checkboxes that cannot be unchecked are not a nice touch, either.