This is a big problem on 7004. I have clients who have zero balance due on the extension - either because of

1. overpayment from prior years,

2.  estimated tax payments

3. Loss.

so the balance due on extension is zero. That means I cannot efile extension. This is extra hassle of prinintg so many extensions, mailing it. and keeping proofs.

Would it help to have tentative tax of $1, show zero payments, and file extension for a $1? Because that removes the error. But it is ridiculous.