@hentaxx No you do not need to know the five digit self-select pin from the prior year’s Form 8879C to successfully e-file the 1120 in TurboTax.
TurboTax does not support Form 8879C, so you will e-file by
- Filling out Form 8453-C within the program,
- Downloading the form,
- Signing the paper copy, and
- Uploading via a scan or picture back into TurboTax to e-file.
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