Oh, but not on the tax you supposedly owe going back seven years (IOW the statute of limitations), but merely on penalties and interest. Which means these corrupt blood suckers have evry intention of collecting every dime applicable to the years and if you have no receipts, be no doubt happy to apply the standard .006 to your income gross covering those years, and bill you for it, whether you in fact owe that amount or not!
That is to say, putting any figure on line 22 is tantemount to an admission that you do in fact owe the tax, and very likely owe even more going back to 2004!
So, even if you think you're off the hook by handing over the demanded extortion by the most notoriously corrupt state in the union?
You do that? And you can expect to hear from them again about the previous six years.
Illinois is one of the 5 worst states in the Union.