Yes, your 2021 1120 is due to be filed (without an extension) by 3/15/22.
A C-Corp is responsible for paying taxes on income before distributions, so if you report a profit, you will know the amount due when you complete your return. It is not an estimated payment.
If your S-Corp election is approved then it will change how you report your 2022 taxes, but it will have no effect on your 2021 taxes payable by the C-Corp. You will not get any amount back.
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