Business & farm

If using the professional tax preparer software, does one need to know the 5 digit self-select pin from the prior  year's form 8879C to successfully efile the 1120?

 

What do you do if you can't remember the old 5 digit pin you entered? Can you select a new 5 digit pin or will the return be rejected? If it's rejected without the correct last year's pin, what is the solution?

 

Thank you.