Seller will not provide Schedule E upon request?

[Paul Winka]

Just as the subject says, the seller won't provide the Schedule E for a 3/1 SFH house I am considering as a B&H. The reason is that he is "behind on taxes" and I should just make an offer without it. I feel as though this is some kind of sucker test, not to mention it comes across as unprofessional. But is this really unprofessional or just a polite refusal? I was under the impression that providing a Schedule E is not out of line and quite normal and a serious seller should provide it on request.

What would you do?