Does anyone know how to change TurboTax from automatically loading in your entity type? I need to file my extension as a Corp, not an S-Corp yet.

You can't change a return from an S-Corp to a C-Corp.   You will have to start a new return.  When you start the return, be sure to indicate that you did NOT use QuickBooks.  You will then be prompted to select what type of return you want to create.  You will select C Corporation (Form 1120).  See screenshot below.  You can use the new return to file your extension, and then continue using the old S-Corp (1120-S) to prepare the company's tax returns.

Are you saying you will be filing the "late election" to be taxed as an S-corporation for 2024?

If so, first, verify that you qualify for the election.

Second, one of the requirements for the late election is that once you realize you forgot to file the election on time, you have "diligent actions to correct the mistake upon discovery".  In other words, file the election NOW.

Third, one of the requirements for the late election is that you thought you were being taxed as an S-corporation and were acting like it.  That means you file the extension as an S-corporation, not a C-corporation.  If you file as a C-corporation, you would be indicating you were NOT acting as an S-corporation and would NOT qualify for the late election.

If you meant you'll be making the S-election for 2025 (or a future year) and will be filing as a C-corporation for 2024, just ignore my prior comments.  🙂