This needs to be reported in two areas:
- A distribution of property to a shareholder is deemed to have the same impact as if it were sold to the shareholder at FMV. This income (or I suppose loss potentially since this is a liquidating distribution) is then reported on the 1120S return.
- Liquidating distributions need to be reported on form 1099-DIV which has two boxes; one for cash liquidating distributions and one for noncash liquidating distributions. This is reported to you at FMV on the 1099-DIV.
You then adjust your basis for the final year K-1 impact and then look at your liquidating distributions and determine your overall gain or loss which is reported on Sch D and the applicable 8949 on your 1040.