Used TTax Business to prep 2020 1120s return having no income and no expenses so all zeros printed in Income & Deductions yet line 22a thru 27 all blank. Is that OK?

[bwwpe]

I filed timely via cert mail/RR but IRS is assessing late filing penalty. Could return not be "processable" therefor not acceptable due to blanks?

[tagteam]

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@bwwpe wrote:
Could return not be "processable" therefor not acceptable due to blanks?

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It really does not matter much at this point. Simply return your proof of mailing with the IRS letter and a note explaining that the return was timely filed and there should be no penalty.

[Critter-3]

The 2020 form 1120S was due 3/15/2021  so did you mail it in late ?    If so you can ask for penalty forgiveness if this is your first transgression.