If I change my Fed EIN # in Quickbooks this month January 2024 for the conversion to a sole member SCorp before I use TurboTax to figure my 2023 taxes as a sole proprietor - will that mess up TurboTax calculating my 2023 tax return as the sole proprietor when I import the Quickbooks file - since the FEIN will have changed but the Quickbooks computer file name will not change-
First, understand there's no such thing as a "single member S_Corp". It's just a S-Corp, regardless of the number of owners/members.
Yes, it will mess things up. Do not change anything in QB until after you've imported into TTX 2023. for the change from single member LLC to S-Corp. Keep in mind that there's significantly more to change in QB than just the EIN. In fact, you "should" start the S-Corp as a completely new business in QB. That's because an S-Corp files it's own physically separate 1120-S corporate tax returns. You'll need to identify the new business as an S-Corp, and assign tax lines numbers that corespond to the line numbers of the 1120-S. Right now, your tax line assignments in QB correspond to those of a SCH C form.
If you just "change things" in the existing LLC business in QB, it can, and most likely will, mess the historical information up something fierce. So just create a new business in QB and press on from there. If you need help with the QB side of things, it's best to seek that assistance in the QB support forums.
