@SeattleCPA - TurboTax was pretty clear about the employer retirement contribution being "paid or payable for 2021" - I was planning on actually making the transfer sometime in 2022 originally. I guess that "payable" vs. "actually paid" is something I could have adjusted for on the basis computation.
I wound up just putting $8,000 into the business in early December, then actually doing that 401k transaction before the end of the year just to get it all over with. On 1/1/2022, had about $850 in the business account and that matches the basis computation I'm seeing in Turbotax.
Now if I could actually file the return - you wouldn't happen to know when 1120S and such are going to be open for filing? Turbotax continues to simply report "soon".
I responded to this before... but then must not have clicked "post." But to try again...
First, I think what's happening with your pension and basis issue maybe goes like this. (I'm simplifying and using round numbers to make this easier to understand.)
So say you start and end the year with a zero cash balance. E.g., your business generates $100K in revenues, incurs $50K in expenses, and then distributes the remaining $50K to shareholder.
If you then add another deduction to the tax return--say a $10K SEP-IRA deduction--I think what happens is TurboTax must know that at year end, S corporation owes (or has in effect borrowed) money. I.e., it owes $10K to SEP-IRA because it has deducted the $10K SEP-IRA contribution on the return.
And then in effect, that means the S corporation is indirectly using borrowed funds to make a distribution. And that creates the distribution in excess of basis--$10K in this example--which in turn creates a LT capital gain.
Two comments about this particular issue:
1. It will reverse itself eventually when you close the S corporation if you do your accounting correctly and track this on your tax returns. Some day in the future, you'll book an offsetting $10k LT capital loss.
2. You won't want to do this though... I.e., you want to leave some cash in the business and accumulate some basis. This is also an example of the sort of trouble or trap an alert tax accountant would have helped you dodge. (I am always a proponent of folks DIYing their returns with something like TurboTax... but once you start dealing with stuff like S corporations, I think it's beyond DIY...)
P.S. Regarding when you can e-file an S corporation return... I think I saw IRS says that'll open next week?