1120 vs 1120S

[jsoles24]

My client filed a C Corp in 2017. In December 2019, the IRS accepted my client's election as an S Corp effective with the accounting period ending Dec. 31, 2017. As a result, I prepared an 1120S for 2017. Would the 1120S be an amended return or do I just file the 1120S as if the 1120 had not been filed?

[TaxGuyBill · Accepted solution]

This doesn't really answer your question, but I don't understand how the IRS could accept a retroactive S-election to 2017.  One of the requirements for a late election is that it was treated as an S-corporation that entire time.  Filing a C-corporation return should have voided the ability to claim S-status in 2017.